Borrowing it
Nothing to install: this file belongs to cyanheads/cdc-health-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/cyanheads/cdc-health-mcp-server/main/CLAUDE.mdgit clone --depth 1 https://github.com/cyanheads/cdc-health-mcp-serverWrote 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/cyanheads/cdc-health-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/cyanheads/cdc-health-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/cyanheads/cdc-health-mcp-server/claude-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.
<a href="https://agentmods.dev/instructions/cyanheads/cdc-health-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/cyanheads/cdc-health-mcp-server/claude-md.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.08242 | $0.08242 |
| Opus 5 | $0.04121 | $0.04121 |
| Sonnet 5 | $0.01648 | $0.01648 |
| Haiku 4.5 | $0.00824 | $0.00824 |
Grade A, and why
cdc-health-mcp-server CLAUDE.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 12d 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 — 449 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Protocol
Server: cdc-health-mcp-server
Version: 0.8.6
Framework: @cyanheads/mcp-ts-core ^0.12.3
Engines: Bun ≥1.3.0, Node ≥24.0.0
MCP SDK: @modelcontextprotocol/server ^2.0.0
Zod: ^4.4.3
Read the framework docs first:
node_modules/@cyanheads/mcp-ts-core/CLAUDE.mdcontains the full API reference — builders, Context, error codes, exports, patterns. This file covers server-specific conventions only.
Domain
Wraps the CDC Open Data portal (~1,080 datasets) via the Socrata SODA API v2.1. No auth required — optional app token for higher rate limits.
Core workflow: discover → inspect schema → query. The catalog is heterogeneous (disease surveillance, mortality, behavioral risk, vaccinations, environmental, injury, etc.), so the server provides a discovery-first approach rather than hard-coding dataset knowledge.
API Surface
Design doc: docs/design.md — full parameter tables, error modes, API endpoints, and implementation notes.
The three Socrata tools take an allowlisted domain input (data.cdc.gov default, chronicdata.cdc.gov) — Zod z.enum rejects any other host before the handler runs (the SSRF guard). The two cdc://datasets… resources stay on the default host. cdc_query_wonder hits a different CDC system and takes no domain; its database enum picks the dataset code in the upstream path, and is the same kind of guard.
| Definition | Type | Purpose |
|---|---|---|
cdc_discover_datasets |
tool | Search catalog by keyword/category/tag. Entry point. Trimmed payload — assetType, columnCount + an 8-name columnSample and a 300-char description; full column detail comes from cdc_get_dataset_schema. |
cdc_get_dataset_schema |
tool | Fetch column schema, row count, metadata for a dataset ID. Full-detail surface, windowed — column_limit (default 100, max 500) / column_offset, with totalCount/truncated/nextOffset enrichment. Fails not_queryable on a non-tabular asset instead of returning empty columns. |
cdc_query_dataset |
tool | Execute SoQL queries — filter, aggregate, sort, full-text search. Continuation is measured by an over-fetch probe, not the row count, and the page is bounded by a character budget; discloses truncated/shown/cap/nextOffset, never a totalCount. |
cdc_query_wonder |
tool | Query CDC WONDER for national deaths, population, crude/age-adjusted rates. Grouped by year/age/sex/race, filtered by ICD-10 cause. A database enum selects one of five mortality databases — D76 (default), D176 provisional, D158, D77, D157. Whole table by default; limit/offset page the parsed rows with totalCount/truncated/nextOffset, re-basing cellNotes onto the page while caveats/messages stay whole. |
cdc://datasets |
resource | 50 most-viewed catalog entries for orientation — carries assetType + columnCount, since the page mixes charts/stories/filters in with datasets. |
cdc://datasets/{datasetId} |
resource | Dataset metadata + the first 100 columns, carrying columnCount/truncated/notice. Takes no selector — the SDK's UriTemplate.match compiles RFC 6570 query variables as required, so {?column_limit,column_offset} would stop the bare URI matching at all. |
analyze_health_trend |
prompt | Guided workflow: pick the source (WONDER for national mortality, Socrata otherwise), then discover → inspect → query → compare → synthesize. Routing is prose the reader acts on — the handler never classifies the topic. |
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.
- 12d ago First seen · 449 lines · 8,242 tokens per session scan A ad3227885307
cdc-health-mcp-server CLAUDE.md is an instructions file published in the GitHub repository cyanheads/cdc-health-mcp-server (5 stars, last pushed 20d ago), licensed Apache-2.0. It adds 8,242 tokens to every session, about $0.0412 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
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.
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
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.
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).
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).