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/kenlsm/node-huckleberry-mcp/agents-mdgit clone --depth 1 https://github.com/KenLSM/node-huckleberry-mcpWrote 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.
[](https://agentmods.dev/instructions/kenlsm/node-huckleberry-mcp/agents-md)<a href="https://agentmods.dev/instructions/kenlsm/node-huckleberry-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/kenlsm/node-huckleberry-mcp/agents-md.svg" alt="Measured on agentmods" height="20"></a>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 | $0.02109 | $0.02109 |
| Opus 5 | $0.01055 | $0.01055 |
| Sonnet 5 | $0.00422 | $0.00422 |
| Haiku 4.5 | $0.00211 | $0.00211 |
Grade A, and why
node-huckleberry-mcp 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 4d 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 — 155 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Guidance for humans and AI agents working in this repo. This is the canonical
contributor guide; CLAUDE.md points here.
What this project is
A Node (TypeScript) MCP server for Huckleberry (the baby-tracking app), ported from two MIT-licensed Python projects:
Woyken/py-huckleberry-api— Firebase Auth + Firestore client.bckenstler/py-huckleberry-mcp— FastMCP server (22 tools, 5 categories).
Most design/behavior is lifted from these; credit them (see T3.7 in TASKS.md).
Architecture (two layers — keep them separate)
| Layer | What | Node choice |
|---|---|---|
| API client | Auth + Firestore reads/writes | Firebase JS SDK (firebase npm) — decided & live-verified in T0.2 |
| MCP server | Exposes tools over MCP | @modelcontextprotocol/sdk (official TS SDK) |
Read docs/architecture.md before touching the client layer — it has the
verified auth mechanism, the live Firebase config, the Firestore collection
layout, and the child-resolution schema (childList[].cid). Key facts:
- Auth: Firebase email/password (
signInWithEmailAndPassword); the SDK handles token refresh automatically. - Data: Firestore via the SDK. Raw Firestore REST does not work for us
(Firebase ID tokens are rejected with
ACCESS_TOKEN_TYPE_UNSUPPORTED) — don't try to replace the SDK with barefetch().
Repo layout
TASKS.md # the roadmap / status
docs/architecture.md # auth + data mechanism, live-verified Firestore schema, toolchain
docs/schema-port-spec.md # exact build-to spec for the client ops/models
docs/integration-testing.md # how to run the gated live suite + schema inspector
scripts/inspect-schema.mjs # dumps real Firestore shapes (needs creds) — ground truth
.github/workflows/ # ci.yml (Node 24), inspect-schema.yml, live-integration.yml
src/
config.ts # public Firebase client config + TOKEN_EXPIRY_MARGIN_MS
util/timezone.ts # huckleberryOffsetMinutes() — the `offset` field
auth/ # HuckleberryAuth — sign-in + SDK-managed refresh
client/ # HuckleberryClient (base) + prefs.ts helper + *Ops.ts per tracker
models/ # Zod schemas per document type
server/ # MCP server bootstrap, lazy auth (getClient), error handling
tools/ # MCP tool registrations (19 tools), imported by index.ts
__tests__/ # Vitest unit tests + gated live.integration.test.ts
index.ts # entry point: registers tools, starts the stdio MCP server
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.
- 4d ago First seen · 155 lines · 2,109 tokens per session scan A c4fc2f618f24
node-huckleberry-mcp AGENTS.md is an instructions file published in the GitHub repository KenLSM/node-huckleberry-mcp (1 stars, last pushed 15d ago), licensed MIT. It adds 2,109 tokens to every session, about $0.0105 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 2026-08-31.
Other instructions, from other repositories
better-auth-firestore AGENTS.md
AGENTS.md instructions for yultyyev/better-auth-firestore, covering ai assistant guidelines, quick reference, current project state, project structure and key exports.
awesome-copilot-id AGENTS.md
AGENTS.md instructions for GulajavaMinistudio/awesome-copilot-id, covering communication, explanation and documentation, markdown formatting, user communication style and workflow & methodology.
llm-safe-haven CLAUDE.md
Claude Code instructions for pleasedodisturb/llm-safe-haven, covering llm safe haven, what this is, project structure, tdd — non-negotiable (adopted 2026-08-17) and the contract.
hiveshare CLAUDE.md
Instructions for KB-perByte/hiveshare, covering hiveshare — claude.md, repo layout, build & run, key env vars (server) and naming: hive vs memory.
kleosrules AGENTS.md
AGENTS.md instructions for kleosr/kleosrules, covering agents.md — repository agent handbook, law, pack, skills (on demand) and workflows.
finding-unknowns-skills CLAUDE.md
Claude Code instructions for Neeeophytee/finding-unknowns-skills, covering repo notes, what ships, and the gate that decides, version lives in three manifests — move them together, files that must be edited together and shipped guidance is not this file.