Borrowing it
Nothing to install: this file belongs to FreePeak/LeanKG. 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/FreePeak/LeanKG/main/CLAUDE.mdgit clone --depth 1 https://github.com/FreePeak/LeanKGWrote 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/freepeak/leankg/claude-md)<a href="https://agentmods.dev/instructions/freepeak/leankg/claude-md"><img src="https://agentmods.dev/badge/instructions/freepeak/leankg/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/freepeak/leankg/claude-md"><img src="https://agentmods.dev/badge/instructions/freepeak/leankg/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 | $0.00410 | $0.00410 |
| Opus 5.5 | $0.00164 | $0.00164 |
| Sonnet 5.5 | $0.00082 | $0.00082 |
| Haiku 4.5 | $0.00041 | $0.00041 |
Grade A, and why
LeanKG 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 1mo 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.
What it actually says
LeanKG — AI Agent Context
The implementation is 100% Go at the repository root (module github.com/FreePeak/LeanKG).
The Rust tree is gone; any command mentioning cargo, src/, target/, or
CozoDB is historical and will not work. AGENTS.md is the single
source of truth for layout, workflow and the CLI reference — read it first.
Commands that exist
make go-build # CGO_ENABLED=0 binaries into bin/ (leankg, leankg-embed)
make go-test # go test ./... -count=1
make go-vet # go vet ./...
make go-build-tstree # the tree-sitter tier (-tags tstree, needs CGO)
make go-ui-assets # build ui-v2 and sync it into internal/web/embed
make dual-engine # sqlite + live-PostgreSQL acceptance gate
Facts worth knowing before you edit
- Version source of truth:
cmd/leankg/VERSION(go:embed, overridable with-X main.version=).internal/mcp/server.gocarries a second copy pinned by a drift test..github/workflows/release.ymlcuts the tag and publishes the four binaries in one run. - The MCP surface is exactly three tools —
import,query,status— with the action vocabulary resolved ininternal/core. - Storage goes through the
store.Backendinterface (SQLite default, PostgreSQL+pgvector opt-in). Consumers takestore.Backend, never a concrete store. .gitignoregotcha:internal/tstree/**holds vendored generated C grammars andproto/is invisible to a global ignore pattern — checkgit status --ignoredbefore concluding a file is committed.
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.
- 1mo ago Changed · -175 lines · -1,981 tokens per session 8ee47db5f2d2
- 1mo ago Changed · -5 tokens per session acd749b50e83
- 1mo ago Changed · +4 tokens per session c28f5eb5ba75
- 2mo ago First seen · 208 lines · 2,392 tokens per session scan A 028cd759fa1b
LeanKG CLAUDE.md is an instructions file published in the GitHub repository FreePeak/LeanKG (222 stars, last pushed 8d ago), licensed Apache-2.0. It adds 410 tokens to every session, about $0.0016 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 2026-08-30.
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