Sync upstream Buzz a96af89526f7 - #16
Open
dcm-buzz-upstream-sync[bot] wants to merge 2 commits into
Open
Conversation
## Summary - render shared-agent instructions as literal text so Markdown cannot conceal spoiler contents, link destinations, or image sources - reject non-reviewable Unicode controls at every agent-definition boundary while preserving legitimate rendered emoji sequences - verify shared catalog event IDs and signatures before trusting authorship, coordinates, pagination, or executable content - preserve the exact system-prompt bytes between review and execution instead of silently stripping or normalizing content ## Security rationale Shared system prompts are executable configuration. Previously, catalog prompts were projected through the chat Markdown renderer, which could hide text, replace link destinations with benign labels, and turn image syntax into remote loads. Zero-width and bidirectional controls could also make reviewed text differ from what the agent executes. This change establishes a review invariant: the prompt a user sees is the prompt the agent executes. Definitions that cannot be reviewed faithfully are rejected rather than rewritten. Catalog events must also pass Nostr ID/signature verification before they can claim a publisher, coordinate, or cursor. ## What changed - catalog instructions render as exact literal text rather than rich Markdown - catalog relay events are verified on a fresh wire-shaped object before paging, coordinate selection, attribution, or projection - forged content, pubkeys, signatures, and invalid newer heads are ignored and cannot shadow a valid signed definition - TypeScript catalog parsing rejects unsafe remote definitions before they reach the UI - shared Rust validation covers persona create/update/import, inbound relay sync, definition-less managed-agent sync, and catalog publication paths - definition-less managed agents now fail closed on local create, local update, and publication before persistence or relay retention - linked managed agents validate their local name while treating the persona definition as authoritative; their inert record-level prompt is not executed or published - names reject layout controls; prompts retain ordinary newlines and tabs - legitimate emoji composition is supported, including contextual VS16, ZWJ, skin-tone, family, flag, and keycap sequences - detached selectors/joiners, bidirectional controls, tag characters, zero-width concealment, and other default-ignorables remain rejected - names are bounded to 128 characters and prompts to 64 KiB - contributor guidance documents the byte-for-byte review requirement for future sharing paths Validation reports the offending code point and never silently removes it. ## E2E recording [buzz-shared-agent-security-e2e.webm](https://github.com/user-attachments/assets/44d6b75f-0877-490f-bda4-a716fae3f700) The recording demonstrates: - a safe definition remains visible - a prompt containing zero-width `U+200B` is rejected - a name containing bidi override `U+202E` is rejected - the prompt is preserved exactly - spoiler, link, and image syntax remains literal and does not render or load ## Verification Passed locally: - `just test`: all 10 unit and Docker-backed integration stages - desktop frontend unit suite: 4,295 tests - persona catalog relay unit suite: 32 tests, including forged-event and cursor-shadowing cases - focused Rust definition-validation coverage: 3 local create/update tests and 6 publication-filtered tests - complete desktop Tauri library suite after rebase: 2,263 passed, 14 ignored, 0 failed - desktop Tauri clippy with warnings denied and Rust formatting - complete agent Playwright spec: 34 tests - the exact formerly failing `inbox-edit` immediate-attachment smoke test after rebase: 1 test - focused shared-agent publish, literal-review, hidden-control, signature, and cross-member import Playwright coverage - desktop E2E production build and TypeScript typecheck - changed-file formatting/lint and file-size ratchet - pre-commit secret scan and DCO signoff The branch was rebased onto current `main`, which includes the upstream attachment-button label fix. Fresh post-rebase GitHub CI is green for every required and selected check: Desktop Core, all four Desktop Smoke E2E shards, both Desktop E2E Integration shards and their aggregate, Desktop E2E Relay, Desktop Build (macOS), Windows Rust, Rust Lint, DCO, security scanners, and Desktop Release Candidate. The previously failing `Desktop Smoke E2E (3)` shard now passes. The repository-wide desktop check also reports existing CSS formatting/`!important` findings in `components.css` and `terminal.css`; neither file is changed by this PR. GitHub's Desktop Core lint and format stage passes on the rebased branch. --------- Signed-off-by: Alex Rosenzweig <arosenzweig@squareup.com>
![dcm-buzz-sync[bot]](https://github.githubassets.com/images/gravatars/gravatar-user-420.png){kind=avatar}
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Automated upstream sync
This PR integrates the newly mirrored block/buzz:main into dcm-production.
This PR never merges automatically. Review the complete diff, migrations, configuration changes, and all required checks before merging. Merge using Create a merge commit so upstream ancestry is preserved.
Recovery tag:
dcm-before-upstream-20260813-064646-a96af89526f7Upstream commit:
a96af89526f7181543e7651100a944aa8e21812bUpstream commits (first 20)\n- a96af89 Harden shared agent instruction review (block#4220)