Borrowing it
Nothing to install: this file belongs to cyanheads/chembl-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/chembl-mcp-server/main/CLAUDE.mdgit clone --depth 1 https://github.com/cyanheads/chembl-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/chembl-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/cyanheads/chembl-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/cyanheads/chembl-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/chembl-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/cyanheads/chembl-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 | $0.07121 | $0.07121 |
| Opus 5 | $0.03560 | $0.03560 |
| Sonnet 5 | $0.01424 | $0.01424 |
| Haiku 4.5 | $0.00712 | $0.00712 |
Grade A, and why
chembl-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 8d 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.
This is a copy
77% identical to obsidian-mcp-server AGENTS.md — 336 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 415 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Developer Protocol
Server: chembl-mcp-server
Version: 0.2.4
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.
Server surface
ChEMBL drug-discovery data over the EBI REST API (https://www.ebi.ac.uk/chembl/api/data) — keyless, read-only. The curated compound ↔ target ↔ bioactivity link, plus drug mechanisms and indications.
Tools (src/mcp-server/tools/definitions/):
| Tool | Purpose |
|---|---|
chembl_search_molecules |
Discovery entry point — find compounds by name / ChEMBL ID / InChIKey, or structure search (exact / similarity / substructure) from a SMILES |
chembl_search_targets |
Resolve a protein / gene / UniProt accession to the ChEMBL target ID chembl_get_bioactivities needs |
chembl_get_bioactivities |
Flagship compound↔target bridge — bioactivity measurements for a molecule, a target, or both (which narrows to that compound–target pair); potency_view picks the measurements with a derivable pchembl_value (default) or exactly those without one; large sets spill to a per-view DataCanvas table SQL'd via chembl_dataframe_query |
chembl_get_drug_info |
Drug pharmacology — mechanism(s) of action, target(s), first-approval year, clinical indications |
chembl_get_assay |
Assay provenance behind a bioactivity row — type, target, organism, 1–9 confidence score |
chembl_dataframe_query |
Read-only SQL SELECT over the spilled bioactivity rows (canvas) |
chembl_dataframe_describe |
List tables/columns staged on a canvas before querying |
chembl_dataframe_drop |
Drop a staged table early. Opt-in behind CHEMBL_DATAFRAME_DROP_ENABLED; wrapped in disabledTool() when off, so it carries the enable hint in the manifest while staying absent from tools/list |
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.
- 8d ago First seen · 415 lines · 7,121 tokens per session scan A 3eb9f11b9a76
chembl-mcp-server CLAUDE.md is an instructions file published in the GitHub repository cyanheads/chembl-mcp-server (1 stars, last pushed 14d ago), licensed Apache-2.0. It adds 7,121 tokens to every session, about $0.0356 per session on Opus 5. A static security scan graded it A with 0 findings. It is 77% identical to obsidian-mcp-server AGENTS.md, differing in 336 lines, and is treated as a copy.
Other instructions, from other repositories
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).
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).
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.
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.