Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/chrisromp/copilot-bridge/agents-mdgit clone --depth 1 https://github.com/ChrisRomp/copilot-bridgeWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.02205 | $0.02205 |
| Opus 5 | $0.01103 | $0.01103 |
| Sonnet 5 | $0.00441 | $0.00441 |
| Haiku 4.5 | $0.00220 | $0.00220 |
Grade A, and why
copilot-bridge AGENTS.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md — copilot-bridge
Repo: https://github.com/ChrisRomp/copilot-bridge
Keep this file up to date as the architecture evolves or new conventions emerge. If you make structural changes, add a new platform adapter, or change key patterns, update the relevant section here.
For project overview, configuration, chat commands, and deployment, see README.md.
Build & Check
npm install # install dependencies
npx tsc --noEmit # type-check (always run before deploying)
npm run dev # run with watch mode (tsx watch)
npm test # vitest suite
npx vitest run src/path/to/file.test.ts # single test file
Restart the running service after changes:
scripts/restart-gateway.sh
# Or: launchctl kickstart -k gui/$(id -u)/com.copilot-bridge
⚠️ NEVER use
launchctl unload && launchctl load—unloadkills the bridge process (including your session), so theloadhalf never executes and the service stays down.
Internal Architecture
Message Flow
MattermostAdapterreceives a WebSocket event, normalizes it toInboundMessageindex.tsserializes handling per channel via promise chains (channelLocks), checks for slash commands, then forwards toSessionManager.sendMessage()SessionManagercreates/resumes aCopilotSessionviaCopilotBridge(SDK wrapper), wiring up permission and user-input handlers- SDK session events flow back through
sessionManager.onSessionEvent()→handleSessionEvent()in index.ts StreamFormatterconverts SDK events toFormattedEvent, which are routed toStreamingHandlerfor edit-in-place message updates
Event Serialization
Both inbound messages and session events are serialized per-channel via separate promise chains (channelLocks and eventLocks). This prevents race conditions on stream auto-start and permission resolution.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 2d ago First seen · 149 lines · 2,205 tokens per session scan A 6674d4a4e6c7
copilot-bridge AGENTS.md is an instructions file published in the GitHub repository ChrisRomp/copilot-bridge (20 stars, last pushed 1mo ago), licensed MIT. It adds 2,205 tokens to every session, about $0.0110 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.