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/migratorywhale/stackchan-mcp/agents-mdgit clone --depth 1 https://github.com/migratorywhale/stackchan-mcpWhat 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 | $0.01775 | $0.01775 |
| Opus 5 | $0.00888 | $0.00888 |
| Sonnet 5 | $0.00355 | $0.00355 |
| Haiku 4.5 | $0.00178 | $0.00178 |
Grade A, and why
stackchan-mcp AGENTS.md scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -sS --max-time 5 http://$STACKCHAN_IP/audio/status How it starts
The opening of the file, as written. The whole thing — 185 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Stack-chan Project Guide
This repository contains firmware and host-side tooling for a push-based Stack-chan voice avatar running on M5Stack CoreS3.
Scope
firmware/contains the Arduino/PlatformIO firmware for M5Stack CoreS3.mcp-server/contains a Python MCP server that lets clients control Stack-chan over HTTP.faces/andfirmware/data/contain the PNG face assets used by the device.start-http.shstarts the MCP HTTP server. Public tunnel startup is opt-in withSTACKCHAN_ENABLE_PUBLIC_MCP_TUNNEL=1.
Important Rules
- Do not read or use any
CLAUDE.mdfiles. They are for a different assistant. - Do not call memory, identity, or introspection MCP tools such as
imprint-memory,memory_search,breath, or similar tools. - Be careful with live-device endpoints.
GET /audioconsumes and clears the current recording buffer on the device. - Do not overwrite local secrets or Wi-Fi settings in
firmware/src/config.h. Usefirmware/config.h.examplefor documented defaults. - Avoid destructive git operations unless explicitly requested.
- Use Conventional Commits for all commit messages.
Firmware Notes
The firmware exposes a local HTTP API on port 80:
POST /playqueues a WAV URL for playback.POST /play/pcm?session=<id>&seq=<n>&final=<0|1>plays or queues a raw24kHzmonos16lePCM segment. The MCP server sends Fish PCM in bounded segments withContent-Length; firmware only queues segments for the active PCM session and clears queued PCM on playback timeout.POST /modeswitches betweenapiandmcprecording behavior.GET /audio/statusreports whether a recording is ready.GET /audioreturns the latest WAV recording and then clears it.POST /move,POST /home,POST /nod, andPOST /shakecontrol servos.POST /faceandGET /facecontrol or inspect the current expression.GET /snapshotreturns a 320x240 JPEG from the camera.
Key services live in:
firmware/src/http_server.cppfirmware/src/mic_service.cppfirmware/src/playback_service.cppfirmware/src/face_service.cppfirmware/src/servo_service.cppfirmware/src/camera_service.cppfirmware/src/wifi_manager.cpp
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 · 185 lines · 1,775 tokens per session scan A e298ec230d22
stackchan-mcp AGENTS.md is an instructions file published in the GitHub repository migratorywhale/stackchan-mcp (71 stars, last pushed 3d ago), licensed MIT. It adds 1,775 tokens to every session, about $0.0089 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
FastLED GEMINI.md
Gemini CLI instructions for FastLED/FastLED, a project described as: The FastLED library for colored LED animation on Arduino. Please direct questions/requests for help to the FastLED Reddit community: http://fastled.io/r We'd like to use github "issues" just for tracking library bugs / enhancements.
kicad-happy GEMINI.md
Instructions for aklofas/kicad-happy, covering kicad-happy, agent guidelines, skills, running analysis and schematic analysis.
brilliant_sdk AGENTS.md
Instructions for brilliantlabsAR/brilliant_sdk, covering brilliant sdk — agent guide, how an app works (the pattern behind everything), minimal reading paths, verify without hardware and testing.
NeoMind CLAUDE.md
Instructions for camthink-ai/NeoMind, covering neomind — edge ai platform for iot, development commands, ecosystem repositories, extension package contract (.nep) and device type template contract (json).
Nothan-OS CLAUDE.md
Instructions for Vinalinux-Org/Nothan-OS, covering claude.md — nothanos, hard rules, toolchain, driver and design philosophy.
Meta-Spatial-SDK-Samples meta-quest.instructions.md
Instructions for meta-quest/Meta-Spatial-SDK-Samples: For this repository, prefer Meta Quest Agentic Tools, the Meta Horizon VS Code/Cursor extension, and the hzdb MCP server.