What is node-huckleberry-mcp AGENTS.md?

A contributor guide for a Node.js and TypeScript server that connects AI tools to Huckleberry, a baby-tracking app. It explains the project structure, data layout, authentication, and the separation between the data client and the MCP server.

Use it when working on the Huckleberry server, especially its Firebase login, Firestore data access, or tools exposed to AI applications.

It gives developers and coding agents the project rules they need before changing code. This helps prevent mixing responsibilities or using the wrong Firebase and Firestore data structures.

How KenLSM/node-huckleberry-mcp configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to KenLSM/node-huckleberry-mcp. 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/KenLSM/node-huckleberry-mcp/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/KenLSM/node-huckleberry-mcp

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/kenlsm/node-huckleberry-mcp/agents-md/github.svg)](https://agentmods.dev/instructions/kenlsm/node-huckleberry-mcp/agents-md)

Your own site

<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/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/kenlsm/node-huckleberry-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/kenlsm/node-huckleberry-mcp/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,109 This file is loaded in full into every session.

When invoked 2,109 The same file — it is already loaded in full.

Security scan A 0 findings. 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	$0.02109	$0.02109
Opus 5.5	$0.00844	$0.00844
Sonnet 5.5	$0.00422	$0.00422
Haiku 4.5	$0.00211	$0.00211

Measured 2mo ago against content hash c4fc2f618f24, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 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.

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.

AGENTS.md · 155 lines

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 bare fetch().

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

Read the full file on GitHub · 155 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 First seen · 155 lines · 2,109 tokens per session scan A c4fc2f618f24

Subscribe to this mod's changes

node-huckleberry-mcp AGENTS.md is an instructions file published in the GitHub repository KenLSM/node-huckleberry-mcp (1 stars, last pushed 2mo ago), licensed MIT. It adds 2,109 tokens to every session, about $0.0084 per session on Opus 5.5. 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.

baby-sleep baby-tracker claude cursor firebase firestore

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node-huckleberry-mcp: Instructions file for Codex