What is backchannel AGENTS.md?

Repository instructions for Backchannel, a real-time meeting-analysis app that streams microphone audio, creates speaker-labelled transcripts, analyses recent conversation text, and stores findings. They also document its React frontend, FastAPI backend, tests, builds, and Sentrux structural checks.

Use them when developing Backchannel’s frontend, backend, desktop code, tests, Docker setup, deployment, or Sentrux checks.

They explain the system’s main pieces and the commands needed to test or run them. This gives coding agents a reliable starting point instead of making assumptions about the audio, analysis, or storage flow.

How talberthoule/backchannel configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to talberthoule/backchannel. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/talberthoule/backchannel/master/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/talberthoule/backchannel

Made for: Codex, OpenCode.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/talberthoule/backchannel/agents-md/github.svg)](https://agentmods.dev/instructions/talberthoule/backchannel/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/talberthoule/backchannel/agents-md"><img src="https://agentmods.dev/badge/instructions/talberthoule/backchannel/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/talberthoule/backchannel/agents-md"><img src="https://agentmods.dev/badge/instructions/talberthoule/backchannel/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 3,820 This file is loaded in full into every session.

When invoked 3,820 The same file — it is already loaded in full.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What 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 5.1	$0.03820	$0.03820
Opus 5.5	$0.01528	$0.01528
Sonnet 5.5	$0.00764	$0.00764
Haiku 4.5	$0.00382	$0.00382

Measured 2mo ago against content hash 602efaf04e04, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

backchannel AGENTS.md scanned grade B with 1 finding 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 2mo 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.

Reads agent configuration directoriesmediumAgent snooping

.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.

Sentrux is installed at `C:/Users/thoule/.local/bin/sentrux.exe` and configured as a Codex MCP server in `C:/Users/thoule/.codex/config.toml`.

AGENTS.md · 291 lines

How it starts

The opening of the file, as written. The whole thing — 291 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

This file provides guidance to Codex (Codex.ai/code) when working with this repository.

Current Codebase Snapshot

Backchannel (formerly Call Helper) is a real-time meeting analysis app. A React frontend captures microphone audio as PCM16 16 kHz mono and streams it over WebSocket. The FastAPI backend writes speaker-attributed transcript entries, runs Gemini-based analysis agents over recent transcript text, and stores insights in PostgreSQL.

Backend tests live in backend/tests/ as stdlib unittest files; run them from backend/ with python -m unittest discover -s tests. Desktop tests use the same runner from desktop/, and frontend behavior checks use npm run build for typechecking and bundling.

Build & Run

Sentrux Structural Analysis

Sentrux is installed at C:/Users/thoule/.local/bin/sentrux.exe and configured as a Codex MCP server in C:/Users/thoule/.codex/config.toml.

sentrux .              # Open the GUI for this repo
sentrux check .        # Enforce .sentrux/rules.toml
sentrux gate .         # Compare current structure against .sentrux/baseline.json
sentrux gate --save .  # Refresh the structural baseline after intentional architecture changes

Current baseline quality is 6469, with coupling 0.06, 0 cycles, 2 god files, and 35 complex functions. The rules are calibrated to the existing codebase; tighten max_cc, max_fn_lines, and max_file_lines after refactoring current hotspots.

The baseline records the structural metrics used by sentrux gate. sentrux check . is expected to report only the two approved generated lockfile exceptions documented next to max_file_lines in .sentrux/rules.toml; any other finding must be fixed before the baseline is refreshed.

Docker Compose (primary)

docker-compose up --build
docker-compose down -v

Frontend: http://localhost:3000
Backend container: http://localhost:8001
Frontend nginx proxies API and WebSocket traffic from :3000 to backend :8000
Database: PostgreSQL 16 on host port 5432

Read the full file on GitHub · 291 lines

Changes

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.

2mo ago Changed · -11 tokens per session 602efaf04e04
2mo ago First seen · 291 lines · 3,831 tokens per session scan B 4156986cd5e2

Subscribe to this mod's changes

backchannel AGENTS.md is an instructions file published in the GitHub repository talberthoule/backchannel (11 stars, last pushed 1mo ago), licensed MIT. It adds 3,820 tokens to every session, about $0.0153 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

ai-agents fastapi gemini meeting-assistant meeting-notes openai

backchannel AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
backchannel AGENTS.mdtalberthoule/backchannel	Instructions file	11	1mo ago	MIT	B	3,820	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

backchannel: Instructions file for Codex