Blast - Talking with canisters

anvil · 13 October 2025 15:15

Greetings everyone!

TL;DR: It’s an awesome tech drop. Christmas has arrived earlier.

I am happy to announce that Blast got a massive remake. A few years ago, it started as a library that simplified communication with canisters and auto-discovered their interfaces. Today it does that, but in a way that allows your agents (Codex, Cloude, etc) to use it through MCP. The technical details you can check at GitHub - infu/icblast , but let’s first see what it can do.

For the demo, I’ve started a fresh Caffeine.ai project. After asking ChatGPT to refine my 10-line spec for a mini social network app, I gave it to Caffeine, and my app quickly materialized with one input.

Spec here

Tiny, Hackerish, Console-Driven Social Spec (Abstract)

1) Concept & Principles

What it is: A minimal, mobile-first, channel-based microfeed. Interactions happen through a console with slash-commands. UI is single-screen; no inner pages.
Post style: X/Twitter-like short posts (≤ 255 chars) with optional single image. Replies are also ≤ 255 chars. Everything appears in one chronological feed.
Channels: Users join channels. Every post belongs to exactly one channel. Users see a unified timeline of all channels they’ve joined.
Operators: First user to join a channel becomes operator (op), with powers to manage members.

2) Core Objects (Abstract)

User: username (unique), display name (optional), profile photo (client-resized 128×128), join date, status (active/banned per channel).
Channel: name (string, case-insensitive), created at, topic (optional), members, ops, bans.
Post: id, author, channel, text (≤255), image (optional; client-resized ≤512×512; optimized JPEG), created at, likes count, reply count.
Reply: id, parent post id, author, channel, text (≤255), created at, (optional image not allowed for replies—clarify if needed; default: no images).
Like: user, post, created at.
Membership: (user, channel) with role: member | op, joined at, status: active | banned.

3) Information Architecture & Navigation

Single screen app. No navigation to subpages.
Default state (logged-in, no channels): Empty timeline with centered message: “Join a channel”.
Unified Timeline: Stream merges posts and replies from all joined channels, strictly reverse-chronological by created at (newest first). No algorithmic ranking.
Channel presence panel: A right drawer showing members of the currently focused channel (or “All Joined” when viewing unified feed).
- Gesture: Swipe left to reveal the right drawer; swipe right or tap overlay to close.
- Shows: online members (heuristic), ops marked with a badge, member count, channel name.

4) Layout (Mobile-First)

Header (compact):
- Left: app wordmark (text).
- Center: dropdown/pill for channel focus: All (unified) or a specific channel (quick switch).
- Right: user avatar (tap ➜ minimal profile sheet: change photo, username is fixed/unique).
Main Feed (scrollable):
- Post cell: author (username), channel name (pill), timestamp (relative), text, optional image, action row (Like, Reply), counts.
- Reply cell: visually indented beneath parent post in the feed (still chronologically placed in the global stream). Parent preview line (first ~80 chars) can be shown inline to provide context.
- No pagination controls: continuous scroll with auto-fetch older items when near end.
Console (bottom fixed):
- Single input line that accepts commands and plain text (for posting).
- Commands auto-complete and show inline hints.
- When composing a post: attach image (optional). On send, client enforces char limit and image constraints (see §6).
- /help button icon at the left; send at the right.

5) Command Console (Behavior)

The console accepts slash-commands and plain text:
- Plain text creates a new post in the currently focused channel. If focus is All, prompt user to set a channel (/join or switch focus).
- Commands start with / and show a help tooltip while typing.
Command list (baseline):
- /help → Lists all commands with short descriptions.
- /join <channel> → Join or create a channel; first member becomes op.
- /leave <channel> → Leave channel; if last op leaves, auto-op the longest-tenured member.
- /focus <channel|all> → Set the channel that plain text posts go to; affects right drawer.
- /who → Show member list of focused channel (also visible via right drawer).
- /topic <text> (op only) → Set channel topic (optional).
- /op <@user> (op only) → Grant operator role.
- /deop <@user> (op only) → Remove operator role.
- /kick <@user> (op only) → Remove user from channel (they can rejoin unless banned).
- /ban <@user> (op only) → Ban user from channel (auto-removes if present).
- /unban <@user> (op only) → Lift channel ban.
- /me <action> → Post an emote-style action (e.g., “user waves”) in focused channel.
- /channels → (Optional) List channels you’ve joined (textual; no dedicated page).
Command feedback: All commands generate system messages in the feed (e.g., “@alice joined #funchan”, “@bob was banned by @alice”).

6) Posting & Media

Text: ≤ 255 UTF-8 characters. Hard stop; show counter.
Images (posts only):
- Single image per post (default). If multiple selected, take the first (or block with message).
- Client enforces:
  - Resizing to fit within 512×512 (preserve aspect ratio; no upscaling).
  - Export as optimized JPEG.
- Show a local preview with file size before sending.
Replies: Text-only (≤ 255). Appears both:
- As an indented child under its parent (local context).
- As an item in the unified stream according to its own timestamp.
Likes: Tap toggles like; show like count. No reactions beyond like.

7) Roles, Permissions, & Channel Rules

Roles: op and member per channel.
Op acquisition: First to /join a new channel becomes op. Additional ops via /op.
Op powers: /op, /deop, /kick, /ban, /unban, /topic.
Bans: Ban blocks reading/posting in that channel; banned users see command error feedback.
Kick vs. Ban: Kick is one-time removal; user can rejoin. Ban prohibits rejoin until /unban.
Op continuity: If a channel loses all ops, auto-assign op to the longest-tenured active member.

8) Feed Rules & Ordering

Global ordering: Strict reverse-chronological by creation time (server time).
Scope: The unified feed includes posts and replies from all joined channels. The focused view filters to a single channel.
Thread context: Replies render with a one-line parent reference in the global stream; in channel focus, show the parent inline above the reply when first encountered.

9) Status & System Messages

Types: join, leave, op granted/revoked, kick, ban/unban, topic change, help output, errors.
Render style: subtle monospace or gray system line, non-interactive.

10) Identity & Profiles

Username: unique, set at account creation; shown as @username.
Profile photo: user-provided; client-resized to 128×128, square crop, shown as a small circle in feed and header.
Minimal profile sheet: avatar change, display name (optional), view joined channels list (text).

11) Gestures & Micro-Interactions

Swipe left → open right drawer (members of focused channel).
Tap channel pill on a post → switch focus to that channel.
Long-press a post → quick actions (Copy link/id, Like, Reply).
Pull to refresh → fetch latest.
@-mentions: auto-complete usernames of members in the focused channel.

12) Errors, Limits, & Feedback

Message too long / image too large: inline validation before send.
Not in channel: posting plain text while focused on All prompts to /join or /focus.
Permission errors: clear system message (“You must be an op to do that.”).
Rate limiting (suggested): soft limits on posts/replies/likes (e.g., bursts of 5 within 10s) with cool-down feedback.
Name collisions: joining existing channel is idempotent; creating a new channel uses case-insensitive exact match.

13) Presence & “Online” (Lightweight)

Online indicator: heuristic (recent activity within N minutes). Display in right drawer.
Typing indicator: none (keep minimal).
Read receipts: none.

14) Accessibility & Internationalization

Keyboard-first: Console always focused; supports hardware keyboards.
Contrast: High-contrast minimal theme by default; dark mode optional.
ARIA roles & labels for drawer, buttons, like/reply.
RTL text supported; counter and limits remain unaffected.

15) Privacy & Safety (Minimal)

Public by default within channels (no private DMs in v1).
Report content: not included in v1 (operators moderate their channels).
Content retention: posts are persistent; deletions (optional v1) can be omitted for simplicity.
Images: client-side processed; originals are not kept (only the optimized derivative is sent/stored).

16) Observability (Minimal)

Local counters for: total posts, replies, likes per session (optional).
No public metrics beyond like counts.

17) Non-Goals (v1)

No global discovery page or channel directory.
No hashtags, search, or advanced threading.
No quote-posts, reposts, or DMs.
No multi-image posts.
No server-side image transforms beyond storing the client-optimized upload.

18) Copy & Empty States

Empty app: “Join a channel” with hint /join <name> or tap help.
Empty channel: “Nobody has posted yet. Say hi!”
Banned user attempt: “You are banned from #. Ask an operator to /unban @you.”
Help output (sample):
- /help – List commands
- /join <channel> – Join/create a channel
- /leave <channel> – Leave a channel
- /focus <channel|all> – Set where you post
- /who – Show members
- /topic <text> – Set topic (op)
- /op <@user> / /deop <@user> – Manage operators
- /kick <@user> / /ban <@user> / /unban <@user> – Moderate
- /me <action> – Emote

19) Visual Style (Super Minimal)

Typography: system font; monospace for console and system lines.
Color: monochrome with a single accent for links and active elements.
Surfaces: flat; subtle dividers; no heavy chrome.
Density: compact cards; generous touch targets (~44px).
Avatars: small circles; channel pill is tiny, subdued.

20) First-Run & Onboarding

Username selection (unique) → optional avatar upload (resized to 128×128) → land on empty timeline with “Join a channel” prompt and a visible /help hint in the console.

This spec keeps the product sharply minimal, console-first, and channel-centric—while covering the necessary behaviors, constraints, and flows to build a usable, mobile-first microfeed.

Almost exactly what I wanted from the first prompt. I decided to first get the backend to work well, then focus on UI improvements.

What I’ve found while using AI is that it’s best not to try to wrestle it as a developer and attempt to fix things bug after bug manually. Instead, set up the environment, improve connectivity, and create closed loops where, preferably, you aren’t asked to confirm anything - don’t stand in the way of alien technology. A real dev’s job is now to delete AI code for a living. Closed loops in which you let the AI loop for a while and make changes while it’s checking if spec is correct. Think->Act->Evaluate->Repeat. So what I did was open up the Codex agent with Blast MCP installed and gave it that prompt.

I am going to make new posts with updates, because posts have size limits, and I’ll report what happens in real-time.

anvil · 13 October 2025 15:19

Here is what I’ve got from my agent. Keep in mind, Blast isn’t given any other instructions than the prompt. No interfaces, no code. It only auto-discovers the canister interface and knows nothing about the code behind it - just has the text spec.

Agent response using Blast

How I Tested

Scanned methods, fetched schemas, and called them
with multiple principals (IDs 1001 “alice”, 1002
“bob”, 1003 “carol”, plus a few others).
Walked through profile, registration, channels
(create/join/leave), posting, replies, likes, and
file reference flows.
Verified behavior both as registered and unregistered
callers and as non‑members of channels.

Critical Vulnerabilities

Username collision and mutability:
saveCallerUserProfile lets any caller set any
username, change it later, and duplicate existing
names. Example: 1002 set username to “alice” while
1001 already had it. This enables impersonation.
Posting/Replying without channel membership: Callers
can createPost/createReply in channels they haven’t
joined; they can also post to channels that don’t
exist. Example: 1001 posted to Fun without being
a member; 1002 posted to new evil channel without
it existing.
Public timeline ignores membership: getTimeline
returns all posts across all channels to any caller
(even unregistered). This breaks the “joined channels
only” scope and enables passive data scraping across
channels.
Client‑controlled server state: saveCallerUserProfile
accepts joinedChannels and lastActive from the
client and persists them. This invites inconsistency/
confusion and potential UI spoofing of membership.
API argument/schema mismatches:
- createPost schema implies [content, channel,
  imagePath?], but actual successful order is
  [channel, content, imagePath?].
- registerFileReference effective order is
  [path, hash] (not obvious from schema), and
  getFileReference/dropFileReference key by path,
  not hash.
  These mismatches can lead to misuse, data
  anomalies, and security oversights at the client
  layer.

High/Medium Bugs

Channel creation/join semantics:
- joinChannel fails with “Channel not found”
  instead of creating the channel. Spec says /join
  should join or create.
- createChannel auto‑adds the creator and then
  joinChannel allows joining again, resulting
  in duplicate membership entries. Example:
  getChannelMembers dupTest showed the same
  principal twice after createChannel +
  joinChannel.
Case sensitivity: Channel names are case‑sensitive;
you can create fun and Fun as different channels. The
spec requires case‑insensitive exact match.
Replies not in global stream: createReply only
updates the parent’s replies array; replies do not
appear as separate timeline items with their own
timestamps. Spec requires replies to appear in the
unified stream as separate items.
No length validation: Posts and replies longer than
255 characters are accepted; spec requires ≤ 255
chars.
Image reference validation: createPost accepts any
imagePath without checking that a file reference
exists or is owned/registered by the author (could
yield broken or hijacked references).
File reference ops unclear and inconsistent:
- listFileReferences/getFileReference/
  dropFileReference require “registered”; but
  permissions are not role‑ or ownership‑aware.
  Anyone registered can list all references.
- dropFileReference takes path (not hash). No
  feedback when unauthorized or when dropping
  inexistent items.
Registration flow confusion:
- initializeAccessControl is required to avoid
  “User is not registered” on many APIs, but the
  name and behavior are misleading (it actually
  self‑registers callers as user repeatedly).
- saveCallerUserProfile works for unregistered
  users, so onboarding is split across two
  unrelated calls.
Timeline pagination: getTimeline returns an unbounded
array and lacks paging parameters; spec’s infinite
scroll implies server paging/limits.

Not Implemented vs Spec

Operators and moderation:
- No per‑channel roles (op/member), no op
  promotion/demotion, no /op, /deop, /kick, /ban, /
  unban.
- No per‑channel bans or kick rejoin rules.
- No op continuity (auto‑assign longest‑tenured
  member if ops leave).
Channel settings:
- No channel topic set/get /topic.
- No server method to list user’s joined channels
  (spec /channels).
Feed scope/features:
- No server filter for “focused channel vs
  unified feed”. Only a global getTimeline with no
  membership filtering.
- Replies don’t surface as separate items in the
  feed (as required).
- No server system messages (join/leave/op actions)
  emitted or retrievable.
Presence & identity:
- No online heuristic, no op badges or member
  counts surfaced.
- No server‑side enforcement of avatar/photo
  processing constraints (client-only).
- No username immutability enforcement.
Validation & limits:
- No server enforcement of 255‑char text limits.
- No server rate limiting (posts/replies/likes),
  no cooldowns.
Observability:
- No counts for session metrics (even though
  optional).

Additional Observations

Roles: initializeAccessControl sets callers to user
and getCallerUserRole works afterwards; trying to use
assignCallerUserRole as a non‑admin properly fails
with “Unauthorized”. However, there’s no discoverable
path for first admin bootstrapping via the public
endpoints (likely pre‑provisioned). That’s fine if
intentional, but worth documenting.
File references: The effective model is path‑keyed
mapping to hash and presents as {hash, path} items.
That’s workable once documented, but the current
naming/argument order is confusing and error‑prone.
Timestamps are huge integers (likely ns); ordering
appears correct and stable (reverse chronological).
getChannelMembers returns principals only; no roles,
no status (active/banned), no joined time.

Fix List (Actionable)

Enforce username uniqueness and immutability:
- Reject saveCallerUserProfile when username
  changes after first set.
- Enforce a canonical allowed charset and length
  (e.g., 3–32 chars).
Unify join/create semantics per spec:
- Make joinChannel create the channel if it doesn’t
  exist; auto‑set first member as op.
- Prevent duplicate membership entries on
  createChannel + joinChannel.
Make channel names case‑insensitive:
- Store and match channels with case‑folded keys;
  preserve display case.
Enforce membership on content actions:
- Require membership for createPost, createReply,
  and likePost/unlikePost within a channel.
- Optionally allow public read, but filter
  getTimeline by caller’s joined channels by
  default (or provide a getTimelineForCaller
  variant).
Show replies as feed items:
- Store replies as first‑class feed entries with
  their own IDs/timestamps and include them in
  the unified feed sorted by their own time; keep
  parent linkage for rendering indentation.
Add spec’d moderation and channel settings:
- Per‑channel roles (op, member, banned) with join
  time and status.
- /op, /deop, /kick, /ban, /unban, /topic.
- Op continuity when no ops remain.
Validate content constraints:
- Enforce ≤255 chars for posts and replies; reject
  otherwise.
- Optional: validate imagePath exists in file
  references and belongs to the caller (or is
  allowed).
Clarify and correct API contracts:
- Fix input order for createPost (should be
  [channel, content, imagePath?]) or update the
  schema accordingly. Mismatch currently leads
  to posts in bogus channels (e.g., channel ==
  content).
- Document registerFileReference(path, hash) and
  that getFileReference/dropFileReference are keyed
  by path.
- Consider a single “register or upsert by path”
  behavior and return a result for feedback.
Registration flow:
- Replace or alias initializeAccessControl with
  a clear self‑registration endpoint (e.g.,
  registerUser) and couple it with first‑run
  saveCallerUserProfile.
- Ensure profile update requires a registered
  caller.
Paging:
- Add paging parameters to getTimeline (e.g.,
  beforeTimestamp, limit); return a cursor for
  infinite scroll.
Security/roles for files:
- Restrict listFileReferences to admin or return
  only caller‑owned references.
- Enforce ownership on dropFileReference.

Nice-to-Haves / Optional

Add getChannel metadata (topic, created at, member
count), listJoinedChannels(caller), and listChannels
(if you later want discovery).
Add server‑side emission of system messages to
the feed for join/leave/op changes and moderation
actions.
Add light rate limiting to protect from abuse (burst
caps and cool‑down messages).
Normalize timestamps to ms if you prefer easier
client handling (or document current unit).

If you want, I can re-run targeted checks after
you patch the critical items (username uniqueness,
createPost arg order, membership checks, case-
insensitive channels, and join/create semantics) to
confirm the fixes.

I’ve copy/pasted this to Caffeine and it upgraded the app. Then I told my agent to run the checks again.

This closed loop will eventually remove all bugs and vulnerabilities from my app. It all depends on how well you close the loops, how many you have and your spec. I’ve tried the strategy with another project and it came out flawless.

The agent made few posts while testing.

To be continued…

anvil · 13 October 2025 15:42

Agent+Blast evaluation #2

Here’s what I found by exercising the backend canister
6yw4f-pyaaa-aaaab-aainq-cai with multiple simulated
users (principals 101–104). I validated joins/leaves,
posting, replies, likes, file refs, roles, and timeline
behavior.

Headline

Critical read-authorization flaw: timeline access is
gated by a client-controlled profile field, not the
authoritative membership store.

Vulnerabilities

Read bypass via profile channels:
- getTimeline uses UserProfile.joinedChannels
  (client-writable via saveCallerUserProfile) to
  decide which channels’ posts are visible. A user
  can add any channel string (or keep it after
  leaving) and read that feed without joining.
- Repro:
  - As user C (id 103), call
    saveCallerUserProfile with joinedChannels:
    [“funchan”] despite not joining; then
    getTimeline shows funchan posts.
  - As user A (id 101), leaveChannel(“funchan”)
    but keep joinedChannels containing “funchan”;
    getTimeline still includes funchan.
File reference ownership/overwrites:
- Any caller can registerFileReference
  (overwriting existing), getFileReference, and
  dropFileReference entries created by other users.
  No auth checks or ownership.
- Repro: user A registers a ref; user B
  registerFileReference with same key to change it;
  user B can dropFileReference for user A’s entry.
Confusing and potentially risky initialization flow:
- initializeAccessControl is required to avoid
  “User is not registered” errors for each
  caller and behaves like a per-user registration
  endpoint. The name implies a one-time admin init
  but it’s callable by any user and must be called
  by each new user to operate. High risk of misuse
  and misunderstandings.

Functional Bugs

Dual source of truth for membership:
- joinChannel/leaveChannel update the channel’s
  member set, but not UserProfile.joinedChannels.
  getTimeline relies on the latter, causing data
  divergence and security issues.
createPost optional param not optional in practice:
- Must pass a third argument (imagePath or null),
  else “Wrong number of message arguments”. Schema
  says optional, implementation expects always
  present.
File reference API parameter/order inconsistency:
- registerFileReference(hash, path) stores and
  listFileReferences returns as {hash: pathStr,
  path: hashKey} (swapped), and dropFileReference
  requires passing the stored “path/hash” id, not
  the “hash/path” shown in output. This will lead
  to client breakage.
No way to fetch replies:
- getTimeline includes replies: [ids] but there
  is no getReply/getPostById to retrieve reply
  content. Clients cannot render replies.
getCallerUserProfile/getUserProfile responses aren’t
consistently returned through the gateway (some
invocations yielded {}), while others returned
{“result”: …}. This inconsistency complicates
client integration.

Not Implemented vs Spec

Channel roles and moderation:
- No per-channel roles (op/member), no “first
  joiner is op”, no /op, /deop, /kick, /ban, /
  unban.
- No op continuity logic (auto-op longest-tenured
  member).
- No bans or permission enforcement beyond “must be
  member to post/like”.
Channel topic:
- No /topic or channel topic storage.
Replies in global stream:
- Spec says replies appear as separate items
  ordered by their own timestamp. Backend only
  attaches reply IDs to posts and doesn’t return
  reply objects as standalone items.
System messages:
- No “join/leave/op/ban/topic/help/error” system
  message entries in the feed.
Channel discovery/list:
- No endpoint to list channels joined or available
  (spec says optional).
Rate limiting:
- No rate limits on posts/replies/likes.
Pagination/cursoring:
- getTimeline has no paging/slicing; spec calls for
  continuous scroll with auto-fetch.

What Works (good)

Membership gating for write actions:
- createPost and likePost require membership; non-
  members get clear errors.
Channel naming:
- Case-insensitive handling for joins (e.g.,
  “FUNCHAN”).
Text limits:
- Post and reply content enforced at ≤255 chars;
  errors are clear.
Username rules:
- Unique usernames enforced; cannot be changed
  after first set.

High-Impact Fixes (recommended order)

Unify membership source of truth:
- Make channel membership the authoritative store;
  do not trust or use UserProfile.joinedChannels
  for authorization. Either:
  - Remove joinedChannels from profile
    entirely (client can derive it from server
    membership), or
  - Keep it read-only and server-managed;
    joinChannel/leaveChannel must update it,
    and saveCallerUserProfile must ignore any
    provided joinedChannels.
- Update getTimeline to filter by the server
  membership set, not the profile field.
Lock down file reference APIs:
- Enforce per-reference ownership (store owner
  principal), and only allow drop/overwrite by
  owner or admin.
- Fix parameter order/mapping; return consistent
  {hash, path} and use a stable key.
- Consider tying image refs to posts to reduce
  dangling/malicious rewrites.
Clarify and redesign initialization:
- Replace initializeAccessControl with a clearly
  named per-user registerCaller() that is
  idempotent and expected for all new users.
- Provide a separate, admin-only initialization
  step for setting the initial admin (restricted to
  canister controller).
Replies API:
- Add getReply(id) or getPost(id) that returns
  reply/post content and metadata.
- Optionally add timeline mode/flag to include
  replies as items to match the spec.

Additional Improvements

Align createPost Candid signature to accept optional
imagePath properly (no “Wrong number…”).
Expose listJoinedChannels for the caller (or derive
from membership), if desired by client UX.
Add optional pagination for getTimeline.
Add basic rate limiting hooks (soft limits) as per
spec suggestion.

This was sent to Caffeine and it now is getting things done, while I am taking the dog for a walk.

oldgregg · 13 October 2025 18:10

this is cool please share more.

anvil · 13 October 2025 19:09

Update. I went thru the loop one more time and then decided to work a bit on the UI. Something bugged and I wasn’t being able to see the messages. Tried telling Caffeine to fix it, but after few prompts nothing happened and I got Blast to check whats up. It found that the canister API isn’t giving me the feed. After going back and forth for a while it turned out that there are two sources of truth about user-channels and once identified, that got fixed.

Then I played a bit with the UI

At some point I told Codex-Blast to create users and populate with demo data, so I can see how to the app deals with more posts and replies. It turned out it was making too many query calls (hundreds per sec) and froze my browser. Told it to make it work with one ‘getFeed’ query and put everything inside. That worked.

Now I am running the same initial prompt with the spec asking it to test everything to see what’s going to come up. The app works well when I am testing it as a user.

Blast evaluation #3

Here’s what I found after exercising the canister as three distinct users (alice=id:1,
bob=id:2, carol=id:3), covering channel join/leave, posting, replying, liking,
profiles, file references, and access controls.

Bugs to fix

Operator continuity broken: When the original operator leaves a channel,
channelInfo.operator still points to the departed principal (f.e., funchan after
alice left). Spec requires auto-assigning op to the longest-tenured active member.
Joined channels list inconsistent: getJoinedChannels does not report seeded
membership (e.g., all three users appear in general via getChannelMembers but
getJoinedChannels returns for them). This breaks UI expectations for the unified
timeline setup.
Join is not idempotent: Calling joinChannel when already a member traps with
“Already a member”. Spec calls for idempotence; should succeed silently or no-op.
Feed omits replies as standalone items: getFeed returns posts with topReplies but
does not emit replies as separate, reverse-chronological items in the global stream
with a one-line parent preview (required by spec).
Channel operator management missing in API surface: channelInfo exposes an operator,
but there is no corresponding mechanism to change it (beyond implicit first-join
behavior), leading to stale operator state (ties back to continuity bug).
Response shape mismatch for file refs: getFileReference returns {hash, path} but
registerFileReference’s second param is used like contentType. Naming is misleading
(hash vs contentType) and will confuse clients and validation.
getChannelMembers signature unclear: Requires (channel, bigint, bigint) but
semantics are undocumented; misuses can silently produce unexpected results (e.g.,
empty sets with “0,0”).
initializeAccessControl appears inert for regular callers: Calling it as id:1 had no
effect (not admin afterwards). If it’s meant to bootstrap, clarify and fix behavior
or restrict to canister controller only with explicit effect.

Security vulnerabilities and risks

Client-controlled presence: saveCallerUserProfile lets the caller set arbitrary
lastActive values (e.g., very large timestamps). This enables presence spoofing and
undermines the “online in last N minutes” heuristic in the spec. Server must set/
update lastActive, not the client.
Unvalidated media references: createPost accepts arbitrary imagePath strings and
does not enforce:
- existence of a registered file reference,
- allowed contentType (e.g., restrict to image/jpeg),
- 512×512 size bounds (spec requires client-side enforcement, but server should at
  least restrict type/ownership).
  This can lead to inconsistent UI, path tricks, or linking to unacceptable
  content types (tested with text/html).
Role escalation surface (global admin): There is a global assignCallerUserRole/
isCallerAdmin concept not in spec. Although restricted (non-admins are blocked),
ensure this role cannot be self‑bootstrapped by non-admins (I could not, but make
sure initialization/upgrade paths don’t leave a gap).

What’s not implemented yet (vs. the spec)

Slash commands as API effects:
- /topic – no method to set a channel topic.
- /op, /deop – no methods to grant/remove operator role per channel.
- /kick, /ban, /unban – no channel-scoped moderation endpoints.
- /me – no endpoint for action posts.
- /who – partially covered by getChannelMembers, but console/system message output
  is not present.
- /channels – no textual list endpoint beyond getJoinedChannels (buggy/
  incomplete).
System messages: Joins/leaves/ops/bans/topic changes/help/errors are not emitted as
feed items. The feed contains only content posts with nested replies; there are no
non-interactive “system lines”.
Unified timeline rendering of replies: Required global stream items for replies
(with one-line parent preview) are missing; only topReplies per post are returned.
Channel topic: The Channel object in responses does not include a topic; no API to
set or view it.
Operator auto-assignment: Not implemented; see bug above.
Presence/online list: No server-side “recent activity” computation; the backend
exposes client-settable lastActive and getChannelMembers without online status
heuristics. The right drawer needs backend support for “recently active” filtering
to be reliable.
Media constraints: No server-side checks for content type or one-image-per-post
constraints; no enforcement of 512×512 (the spec says client-side but minimal
validation is still advisable).
Rate limiting: No observable rate limits on posting/replying/liking (spec suggests
bursts of 5 within 10s with cooldown). None detected.

Other observations

Core flows work: join, leave, create post (<=255 chars enforced), reply (text-only),
like/unlike for posts and replies; membership checks block non-members from posting/
liking/replying.
Username rules: Unique and immutable are enforced (“Username already taken”,
“Username cannot be changed”).
Case-insensitive channels: Joining a differently cased name correctly treats it as
the same channel.
createPost returns null: Consider returning the created postId to simplify client
updates.
getFeed paging/filtering: The two optional bigint parameters behave like filters;
passing “0,0” returns nothing, while null,null returns expected items. Document
expected usage (probably time ranges).

High-priority fixes I recommend

Fix operator continuity: When operators leave, reassign op to the longest-tenured
active member; ensure channelInfo.operator always references an active member.
Make getJoinedChannels authoritative: Ensure it reflects actual membership (seeded
or dynamic); it should agree with getChannelMembers.
Make joinChannel idempotent: Return success/no-op, not a trap, for “already a
member”.
Server-own lastActive: Remove it from saveCallerUserProfile input and update it
server-side on successful user activity or heartbeat.
Validate media references: On createPost, require an existing file reference owned
by caller and allowable contentType (e.g., image/jpeg) before accepting imagePath.
Add moderation+topic APIs per spec: /topic, /op, /deop, /kick, /ban, /unban; wire to
membership/op/bans storage.
Emit system messages: Generate feed-safe, read-only entries for join/leave/op/bans/
topic changes/errors/help output.
Support replies in unified feed: Add reply entries in reverse chronological order
with a one-line parent preview for the global stream.

If you want, I can:

Draft precise endpoint designs for the missing moderation/topic/system-message
features to match your console UX.
Propose a getFeed variant that interleaves posts and replies (with parent previews)
and supports simple pagination.
Add a lightweight server-side presence computation that updates lastActive on
actions and exposes an “online in last N minutes” list for the drawer.

Btw I am not editing the evaluations, just passing them to Caffeine intentionally.

→ Caffeine upgrade.

Blast evaluation #4

Security Vulnerabilities

File reference deletion is unauthenticated/unauthorized. Any user can drop any path.
- Repro: As a normal registered user (id=1000), dropFileReference(“posts/
  fun_1760372465620.jpg”) succeeded even though it appears to be someone else’s
  file.
File reference inputs are unsanitized and unvalidated.
- Repro: registerFileReference(“../../etc/passwd”, “weird-hash”) and
  getFileReference(“../../etc/passwd”) returned the same arbitrary path/hash. This
  enables path traversal-style keys and arbitrary identifiers (e.g., “text/html”)
  in your metadata, which can lead to broken links, cache poisoning, or security
  issues if any downstream URL generation trusts these fields.
Global listing of all file references leaks paths/hashes across users.
- Repro: listFileReferences() returns a global list, including suspicious entries
  like {“hash”:“text/html”,“path”:“evil”} and others. If these are intended to be
  per-user, this is a privacy/integrity issue.
Role registry blocks most calls with “User is not registered” without an accessible
path for new users. While not a classic exploit, this is a security/UX mis-design:
only an admin can assign roles, but no admin promotion path exists for ordinary
users, effectively locking everyone out except the initializer.

Functional Bugs

Cannot create posts in a joined channel: joinChannel does not create the underlying
channel object.
- Repro: As user id=1000, after joinChannel(“qa-20251013”) (confirmed by
  getJoinedChannels and getChannelMembers), createPost(“Hello”, “qa-20251013”,
  null) fails with “Channel not found”.
No practical way to onboard new users into the “user” role.
- Repro: New user (id=1001) can saveCallerUserProfile, but getCallerUserRole,
  joinChannel, registerFileReference, isCallerAdmin all trap: “User is not
  registered”. Only admins can call assignCallerUserRole, but there’s no route for
  a normal user (or even the initializer) to become admin.
initializeAccessControl doesn’t grant admin to the initializer or expose any admin
bootstrap flow.
- Repro: As id=1000, initializeAccessControl() succeeded, but isCallerAdmin
  returned false. assignCallerUserRole(1000, {admin:null}) trapped: “Only admins
  can assign user roles”.
getFeed requires 2 args despite the schema allowing 0–2.
- Repro: getFeed() returned “Wrong number of message arguments”; getFeed(null,
  null) returned an empty array. Schema vs behavior mismatch is likely to break
  clients.
Ownership not enforced in file APIs.
- Repro: Any registered user can register, list, and drop arbitrary file
  references, including those created by others. There’s no link to caller
  identity or channel membership.

Spec Gaps / Not Implemented

Channel operators, per-channel roles, multi-ops, and continuity rules:
- No /op, /deop, auto-assign longest-tenured member, or multi-op support. getFeed
  shows a single “operator” field per channel, conflicting with spec’s “ops” list.
Moderation endpoints missing:
- No /kick, /ban, /unban; no per-channel “bans” or enforcement.
Channel topic management:
- No /topic endpoint or per-channel topic state.
System messages in feed:
- No system messages for join/leave/op/ban/topic changes; errors trap instead of
  posting subtle system lines.
Posting constraints and validation:
- No server-side enforcement for ≤255 char posts/replies; no server validation
  on images beyond file references; replies are text-only per schema, but limits
  aren’t enforced.
Presence and online heuristics:
- No explicit presence endpoint or heuristic; lastActive comes from profile
  fetches/updates, not clear activity-based tracking.
Unified vs focused timeline:
- Only getFeed(start?, end?) for a global feed; no channel-scoped feed endpoint
  (client could filter, but spec hints focused channel views).
Console command equivalents:
- No endpoints to support /who, /me, /channels (though parts could be derived).
Rate limiting and error feedback:
- No rate limit endpoints/behavior; errors are thrown as traps rather than
  producing spec’d system messages in the feed.

What Worked As Expected

Profile flow:
- saveCallerUserProfile enforces unique usernames and forbids username changes.
  getUserProfile(s) return expected data, and server sets lastActive.
Membership listing:
- getChannelMembers(channel, start, end) returns principal ids; however, it’s
  oddly time-windowed and lacks role/banned info.

Suggestions To Fix

Add a public, audited registration path that auto-registers a caller as “user” on
first write action (e.g., first saveCallerUserProfile or joinChannel). Keep admin-
restricted promotion to admin if needed.
Ensure joinChannel creates the channel metadata (or add a createChannel admin-
agnostic path that the first join implicitly triggers), and set the first joiner
as op.
Replace singular “operator” with an “ops” list per channel; implement /op, /deop,
and continuity rules.
Implement /kick, /ban, /unban and enforce them in read/write paths (feed,
joinChannel, createPost/Reply).
Harden file reference APIs:
- Namespace paths per user/channel, sanitize/validate paths, enforce cryptographic
  hash formats, and restrict drop/list/get to the owner (or channel-scoped with
  op privileges).
Align getFeed behavior with its schema; accept 0 args by default or update schema/
clients to require 2 args.
Convert traps for user-facing errors into system messages emitted to the feed (while
returning typed Results to clients).
Add server-side checks for post/reply length limits; even if client enforces,
defense-in-depth on backend.

If you want, I can re-run once you deploy fixes to verify:

New-user registration and joining/posting
Channel creation and first-join operator assignment
Role/ban enforcement and system message emission
File reference ownership checks and path validation

anvil · 13 October 2025 19:54

Blast evaluation #5

Here’s a focused re-run of the security checks we flagged, using two principals (1000
“Alice”, 1001 “Bob”).

Unauthorized Deletion

Still vulnerable: a registered user can delete arbitrary file references they do
not own.
- As 1000: dropFileReference(“posts/aaaa_1760375108749.jpg”) → succeeded.
- Immediately after: getFileReference(“posts/aaaa_1760375108749.jpg”) → trapped
  with “Inexistent file reference”.
- As 1000: dropFileReference(“evil”) → succeeded (deleted a reference not created
  in this session).

Path Traversal / Input Sanitization

Still vulnerable: arbitrary, unsanitized paths accepted and retrievable.
“hash-bad-2” }.
- As 1000: dropFileReference(“../../etc/shadow”) → succeeded.

Global Listing / Privacy

Appears unchanged: listing exposes references beyond the caller’s newly registered
ones.
- As 1000: listFileReferences() returned mixed entries including:
  - {“hash”:“text/html”,“path”:“evil”} (before deletion)
  - Multiple posts/…jpg items not created in this session
- After deletions, the removed entries disappear globally, confirming no ownership
  scoping on delete.

Registration Gating (change observed)

Queries now enforce “registered” role for Bob (1001), reducing leakage to
unregistered users, but not fixing cross-user actions by registered users:
- As 1001: listFileReferences() → trapped “User is not registered”.
- As 1001: getFileReference(“/uploads/retest/alice.jpg”) → trapped “User is not
  registered”.
- As 1001: dropFileReference(“/uploads/retest/alice.jpg”) → trapped “User is not
  registered”.

Net: The core vulnerabilities remain:

No ownership/authorization checks on dropFileReference (registered user can delete
others’ refs).
No path validation/normalization on registerFileReference (path traversal-style
keys accepted).
Reference listing appears global, not per-user/channel scoped.

If you want, I can re-check after you:

Enforce owner-only delete (or channel-op scoped).
Validate/sanitize path (reject traversal, enforce prefix/format).
Scope listFileReferences (per-user or per-channel) and hide non-owned entries.

At this point I began to wonder if the problem was in my agent (I had to restart it few times because its context grew too large. Each time it called Caffeine it could have used the same principals which would make it think unauthorized access was possible even if it wasnt. So I told it to use ids from 1000 to 1050

Blast evaluation #6

Good call — I re-ran with fresh principals (1050/1051) to avoid any stale tester state
and confirmed the vulnerabilities persist for a brand-new “user”-role principal.

What I did

Used new principals: 1050 and 1051.
1050: Registered profile, initialized access control, verified role is user.
1051: Not used beyond setup since cross-account write calls require being
“registered”; focus was on proving cross-user/owner actions from a single registered
user.

Findings (fresh principal 1050)

Ownerless delete still possible
- As 1050 (new user), I listed global refs: listFileReferences() showed prior
  entries like posts/bla_1760376146087.jpg.
- I deleted another user’s reference: dropFileReference(“posts/
  bla_1760376146087.jpg”) → succeeded.
- Verified delete: getFileReference(“posts/bla_1760376146087.jpg”) → “Inexistent
  file reference”.
Path validation still missing
- Previously confirmed with other IDs; behavior does not depend on principal
  identity. Arbitrary paths (including traversal-style strings) are accepted and
  retrievable until deleted.
Global listing persists
- As 1050, listFileReferences() returned globally mixed references not owned by
  1050 (and deletions removed them globally).

Notes on 1051

1051 remained “User is not registered” (as expected given the current access-control
logic). That blocked testing delete from a second registered user; however, the
core issue is already demonstrated: any registered user (like fresh 1050) can delete
arbitrary references they do not own.

Conclusion

Even with completely fresh principals, a newly registered “user” principal can:
- See globally listed references,
- Delete references they did not create,
- And there’s no path/owner scoping enforced on file reference APIs.
Path sanitization/normalization is still absent.

If you want, I can also:

Register 1051 as “user” (if you expose a legit role-assign or auto-user flow) and
repeat cross-user delete between 1050 and 1051 for completeness.

→ Caffeine upgrade

Blast evaluation #7

I scanned the canister and exercised it with Blast identities 2000–2002 to simulate
real use (can extend through 2050 on request). I registered users, joined/left
channels, posted, replied, liked, and manipulated file references to probe auth,
validation, and data integrity.

Security Issues

File reference deletion authorization missing
- Any user can delete another user’s registered file reference. Evidence:
  dropFileReference(“abc123”) by id 2001 removed id 2000’s reference;
  getFileReference(“abc123”) then trapped “Inexistent file reference”.
Image/file reference validation bypass
- Posts accept arbitrary “imagePath” via createPost third arg without checking
  existence or type. Evidence: createPost(“funchan”, “…”, “evil”) produced a
  post with imagePath: “evil”. Also “unregistered/path.jpg” appears in feed.
File reference field mapping bug (enables bad client behavior)
- registerFileReference(“abc123”,“images/user2000.jpg”)
  then getFileReference(“abc123”) returned {“hash”:“images/
  user2000.jpg”,“path”:“abc123”} (fields swapped). createPost(…,“abc123”) shows
  imagePath: “abc123” instead of the stored path.
Avatar path unsanitized
- saveCallerUserProfile accepted avatarPath: “javascript:alert(1)”; getUserProfile
  returns it verbatim. Client rendering this in an img tag risks XSS. Should
  whitelist protocols/paths server‑side or enforce upload pipeline.

Bugs & Data Integrity

Replies exceed 255 chars
- Spec caps replies at 255, but long replies succeeded: createReply(“59”, “z” *
  300) returned success and showed in feed.
Operator continuity broken when last op leaves
- Spec: transfer op to longest‑tenured member. In chanx, id 2000 created and
  was op, id 2001 joined, then id 2000 leaveChannel(“chanx”). Feed still shows
  operator = id 2000 (no longer a member).
Error/trap UX for queries
- Many queries trap for unregistered users (e.g., getCallerUserRole,
  isCallerAdmin) instead of returning a structured result (e.g., guest/false).
  This complicates client UX and contradicts “system message” feedback in the
  spec.
Inconsistent file reference ops feedback
- dropFileReference(“hash-aaa”) by id 2001 returned success but didn’t remove the
  entry when listing immediately after; while dropping “abc123” worked. API should
  be consistent and return an error when unauthorized or not found.

Spec Gaps (Not Implemented)

Channel moderation and ops:
- No endpoints for /op, /deop, /kick, /ban, /unban, or /topic. Operator role
  exists in channelInfo, but no server methods to manage per-channel roles and
  bans.
Unified stream includes replies as items
- Spec: replies should appear as separate feed items (chronologically) and as
  indented under parents. Current getFeed only nests topReplies within posts;
  replies aren’t separate stream items.
Presence and “/who”
- There’s getChannelMembers(channel, since, until) but no clear online heuristic,
  and no simple member list query matching /who behavior.
Rate limiting
- No rate limit enforcement endpoints or signals; burst posting works without
  server throttling.
System messages in feed
- Join/leave/op/bans/topic changes and command feedback are not emitted as system
  lines in the feed as per spec.

Other Observations

Registration flow naming
- Users must call initializeAccessControl to become “user”; the name implies one-
  time canister setup. Consider a dedicated register() that sets role to user (and
  make getCallerUserRole return a guest state instead of trapping).
Channel name handling
- Case-insensitive works (joining “FunChan” adds “funchan”); spaces are allowed
  (e.g., “spaced channel”).
Posting requires membership
- createPost rejects non-members (“You must be a member of the channel to post”)
  — good.
Post length limit enforced
- createPost >255 chars traps as expected.

High-Priority Fixes

Enforce ownership/admin checks on dropFileReference and any file reference
mutations.
Fix file reference mapping and enforce that createPost third argument must resolve
to a registered reference; reject unknown refs.
Sanitize/whitelist avatarPath and any file paths before persisting/returning.
Enforce 255-char limit on createReply.
Implement op continuity when last operator leaves a channel.
Return structured errors for queries and/or emit spec-conformant system messages.

anvil · 13 October 2025 22:26

Looks like all file-related bugs were fixed. The number of vulnerabilities has been reduced a lot. There are no “critical vulnerabilities” anymore, just ‘bugs’. Some of these bugs are probably not real, because the test isn’t perfect either.

Blast evaluation #8

Here’s what I tested against canister 6yw4f-pyaaa-aaaab-aainq-cai using Blast
identities 6000–6050 (I used 6000, 6001, 6002 heavily, plus inspected existing
data), covering registration, roles, channels, posts/replies, likes, feed, and file
references. I validated schemas and executed realistic flows (join/create channels,
post/reply/like/unlike, leave, and file ref ops), including edge cases.

High-Priority Bugs

Access control bootstrap per-user
- Symptom: After saving a profile, joinChannel/getCallerUserRole trap “User is not
  registered” until each user calls initializeAccessControl.
- Impact: Breaks first-run flows; users can’t join or act until they call a low-
  level initializer.
- Expected: One-time canister bootstrap (admin-only), or automatic user
  role assignment on first profile save. Users should never need to call
  initializeAccessControl.
Operator assignment per channel is wrong
- Symptom: Joining/creating new channel “FunChan” by 6000 yields
  channelInfo.operator as a different principal (npjik-…), not the first joiner.
- Impact: Violates spec “first to join becomes op”; moderation features will be
  unreliable.
- Suspected cause: Operator likely stored globally, not per-channel.
Channel members list is incorrect for per-channel context
- Symptom: channelInfo.members for funchan includes unrelated principals (users
  not actually joined to that channel).
- Impact: “who”/presence drawer and membership logic will be wrong and confusing.
Reply character limit not enforced
- Symptom: createReply accepts >255 characters; long replies appear in feed.
- Impact: Violates hard-stop spec; potential UI/layout issues; inconsistent with
  post limit enforcement.
File reference ownership/authorization missing
- Symptom: Any user can drop someone else’s file reference via dropFileReference.
- Impact: Users can grief by deleting others’ references; breaks integrity of
  uploaded media.
File reference lookup field swap
- Symptom: getFileReference returns “hash” and “path” swapped (observed for
  registered entry “hash6000” → {hash: “images/6000.jpg”, path: “hash6000”}).
- Impact: Client logic can mis-handle files; reliance on listFileReferences vs
  getFileReference yields inconsistent semantics.
Role checking and registration disconnect
- Symptom: joinChannel traps “User is not registered” even when
  getCallerUserProfile returns a valid profile, until initializeAccessControl is
  invoked for that user.
- Impact: Conflicting sources of truth for identity vs. roles; hard to build a
  clean onboarding.
Inconsistent handling of getFeed inputs
- Symptom: getFeed rejects zero-args calls (“Wrong number of message arguments”),
  yet schema marks both args as optional; passing [null, null] works.
- Impact: API and schema mismatch; clients must guess how to call.
Case-normalization inconsistencies
- Symptom: channelInfo.name shows lowercase “funchan” but post.channel returns
  “FunChan” as provided at post time.
- Impact: Multiple variants can leak through; risk of duplicate keys/filters on
  client; should normalize channel names at write-time.

Spec Mismatches / Behavior Gaps

Missing moderation and ops methods
- Not implemented: /op, /deop, /kick, /ban, /unban, /topic. No per‑channel role or
  bans system present in API.
Operator continuity not implemented
- Spec: If channel loses all ops, longest-tenured member auto-op’d. No API to
  handle or test this path.
Display name required but spec says optional
- saveCallerUserProfile requires displayName (schema enforced), rejecting requests
  without it. Spec: optional display name.
lastActive required but ignored
- Schema requires lastActive input, but implementation overwrites it with server
  time (getCallerUserProfile shows updated server timestamps). The requirement
  should be dropped from the API.
Inconsistent principal types in API model
- Schema threatens “oneOf principal text or number (0–65535)” for authors/
  likes/members. Actual outputs are principal text. This variability complicates
  clients; API should use one representation consistently (principal text).
Likes idempotency mismatch
- likePost/likeReply trap if already liked (“Post already liked”), but unlikePost/
  unlikeReply are idempotent. UX is easier if both directions are idempotent (or
  toggle in one call).
Membership API oddities
- getChannelMembers requires two bigint string params (likely time range?) and
  returns only principals with no role, status, or timestamps. Not clear or
  aligned to console’s /who needs (members + ops + counts + online).

Security/Robustness Concerns

XSS / injection risk in profile avatarPath
- Observed stored value “javascript:alert(1)” for an existing profile; backend
  accepts any string. If front-end ever uses avatarPath unsafely (e.g., in href
  or as a CSS url), this is an XSS vector. Should sanitize/validate acceptable URI
  schemes and enforce path-based storage (e.g., /uploads/…).
Unenforced file registration for posts
- Posts can set arbitrary imagePath (e.g., “evil”, “unregistered/path.jpg”) with
  no tie to registered file references. If file refs are meant for integrity/GC,
  createPost should validate against registered references or drop the feature
  entirely.
Role checks depend on initializeAccessControl
- Users can bypass join flows or see confusing errors because rights are not tied
  to profile existence. This creates unpredictable access control surfaces.

What Works (Baseline)

User registration: saveCallerUserProfile enforces unique usernames; username cannot
be changed (as per spec).
Channel names are case-insensitive: join “General” returns “general” in
getJoinedChannels.
Membership enforcement: non-members cannot post, reply, or like posts in a channel.
Post character limit: enforced at 255 chars with clear errors.
Reply/like/unlike flows: basic happy paths work; likes/unlikes adjust feed
likeCount; replies appear as topReplies and count increments.

Not Implemented Yet (per Spec)

Channel moderation and roles:
- /op, /deop, /kick, /ban, /unban, and channel topic (/topic).
- Per-channel ops list and continuity logic.
- Channel member status (active/banned) and roles (member|op).
System-/console-messages emitting on actions
- No explicit methods or outputs for system messages (“@user joined”, “banned”,
  etc.).
Presence
- No API for online heuristics beyond storing lastActive on profile; not surfaced
  per channel in a dedicated way.
Help/console hints
- Purely client-side; nothing exposed to back it as structured data.
Rate limiting
- No endpoints or enforcement for soft limits (5/10s) per spec.
Me/emotes (/me)
- Not present.

Recommended Fixes

Make initializeAccessControl a one-time admin bootstrap; auto-assign user role on
first successful saveCallerUserProfile so users can immediately join channels and
act.
Store operator per channel. On first join of a new channel, set op to caller.
Respect op continuity rules as members leave.
Fix getChannelMembers to:
- Remove undocumented bigint args (or document them properly).
- Return structured entries including username/principal, role (member/op),
  joinedAt, and status (active/banned).
Enforce reply length <= 255 in createReply.
Normalize channel names to lowercase at write-time for all fields (channel keys,
post.channel, etc.).
Standardize principal representation (choose principal text everywhere).
Make likePost/likeReply idempotent (no error on second like).
File references:
- Fix getFileReference fields (hash/path not swapped).
- Require auth: only the registrant (or admin) can drop a reference.
- Consider validating createPost.imagePath against registered references (or
  remove the file ref registry if not used).
Relax saveCallerUserProfile schema:
- Make displayName optional.
- Remove lastActive from required inputs; set it server-side.

It’s fair to note that in ~three months, LLMs will improve 10 times, so fewer iterations will be needed.

I would like to have a section in Caffeine where you set up “Loops”. A user can put something like “Check my app if it works well when … and … happens”. Agents will deploy->test with something like Blast->deploy->repeat. It will be costly, but better than having to do the loops manually. The user will specify how much they want to spend and hit run. All loops will be executed until the amount is fully consumed. Perhaps these test loops should run in PocketIc - will be much faster.
Some of these loops could also engage browser agents that go around hitting buttons and checking if the app performance is fine.

Here is the app! Pretty cool for a day. https://consolenet-svo.caffeine.xyz/

You can /join blast if you want to see a few posts.

Let’s get back to Blast - hope you liked the demo. There are a lot of transformations IC canister ↔ agent. It talks JSON schema, auto-converted from Candid. Account objects converted to icrc1 text format. Opt-opt-opt complexity removed. Auto discovery, caching, and identity storage in the box. You can also chain MCPs like Blast and add another layer on top, like DeFi vectors → Blast → IC, where each layer has specialized know-how!

TP.ICP · 14 October 2025 05:52

~~This is wild~~

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Caffeine.ai has gone multi-modal Caffeine Plus	16	24 October 2025
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Canic 0.6 - with 3-in-1 endpoint protection Canic	4	17 December 2025
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