Borrowing it
Nothing to install: this file belongs to chessceo/chessceo-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.
curl -O https://raw.githubusercontent.com/chessceo/chessceo-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/chessceo/chessceo-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/chessceo/chessceo-mcp/claude-md)<a href="https://agentmods.dev/instructions/chessceo/chessceo-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/chessceo/chessceo-mcp/claude-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 5.1 | $0.04606 | $0.04606 |
| Opus 5 | $0.02303 | $0.02303 |
| Sonnet 5 | $0.00921 | $0.00921 |
| Haiku 4.5 | $0.00461 | $0.00461 |
Grade D, and why
chessceo-mcp CLAUDE.md scanned grade D with 3 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 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
--force`, nuke the npx cache dir, wait 20s for CDN propagation, `sudo systemctl restart`, then verify both the running version (reads Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
`deploy-mcp.sh` nukes `~/.npm/_npx` itself before every restart, so this trap is closed for the normal deploy flow. It's still live for anyone (including future-Claude) who restarts the unit directly without going throug Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- **curl/scripts** → same as either of the above How it starts
The opening of the file, as written. The whole thing — 244 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Chess.ceo MCP server
Model Context Protocol server that exposes chess.ceo to LLM hosts (Claude Desktop, claude.ai, ChatGPT). Every tool here is a thin wrapper on a chess.ceo backend endpoint; this package's job is LLM ergonomics, not business logic.
Repo layout (tool defs split out of index.ts in v0.44 — it's no longer a single monolithic file):
src/index.ts Handlers + transport (stdio + streamable-HTTP) + auth. callToolInner's
switch is the source of truth for what each tool actually does.
src/tools.ts All tool schemas (TOOLS[] — pure data, name/description/inputSchema).
src/prompts.ts The three prep-workflow prompts (PROMPTS[]).
src/pgn/ PGN parse/export/describe, node-id ↔ path resolution (paths.ts),
and the mutation primitives (mutations.ts: addLine, addMove,
deleteSubtree, promoteVariation, setAnnotations/Comment/Nags/Tag,
setCeoEval[Many]).
src/prep/ Prep-file library (list/search/read), and mutation orchestration
separate from raw pgn/mutations.ts primitives.
src/analysis/ auto_evaluate / deep_analyse job lifecycle (auto.ts, deep.ts),
file_handle.ts, response shaping.
src/courses.ts find_position_in_courses / read_course_at_position — read-only
reference courses, distinct from the user's own prep files.
src/http.ts Streamable-HTTP transport plumbing.
src/response_transforms.ts UCI→SAN and other LLM-facing reshaping (see "Where this fits").
src/warnings.ts Grounding/guardrail text injected into tool responses.
docs/*.md Bundled at build time, served via read_*_guide tools + matching
prompts: engine-usage.md, prep-strategy.md, prep-files-guide.md,
pgn-authoring.md, summary-authoring.md.
docs/examples/*.pgn Worked PGN examples (italian-fried-liver, najdorf-6-f4-white),
bundled the same way, referenced from pgn-authoring.md.
tools/fenfind/ Python side-tool (polyglot Zobrist index) that find_position_in_courses
shells out to. tools/sf_eval/ — local Stockfish eval helper.
package.json files: ["dist","docs","README.md","tools"]. docs/ and tools/ must
ship or the doc tools and find_position_in_courses degrade/fallback.
Dockerfile For Glama listing's automated safety checks (not for prod).
.claude-plugin/ Claude Code marketplace manifest, unrelated to the npm package.
CLAUDE.md This file.
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 Changed · +43 lines · +1,088 tokens per session 9ca07eab8dbc
- 7d ago First seen · 201 lines · 3,518 tokens per session scan D f6b2743bc2f7
chessceo-mcp CLAUDE.md is an instructions file published in the GitHub repository chessceo/chessceo-mcp (0 stars, last pushed 3d ago), licensed MIT. It adds 4,606 tokens to every session, about $0.0230 per session on Opus 5. A static security scan graded it D with 3 findings (asks for root, recursive force delete, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
Other instructions, from other repositories
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).
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.
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).
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.