Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/yvgude/lean-ctx/copilot-instructionsgit clone --depth 1 https://github.com/yvgude/lean-ctxWhat 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 | $0.00253 | $0.00253 |
| Opus 5 | $0.00127 | $0.00127 |
| Sonnet 5 | $0.00051 | $0.00051 |
| Haiku 4.5 | $0.00025 | $0.00025 |
Grade A, and why
lean-ctx copilot-instructions.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 yesterday.
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
lean-ctx shadow mode: native read/search/shell calls auto-route to ctx_* — no tool-mapping needed. File editing → native Edit/StrReplace (lean-ctx only handles reads); if denied, use ctx_patch. Exclusive tools (no native trigger): ctx_compose (understand code, call first), ctx_search(action=symbol) (exact symbol), ctx_search(action=semantic) (by meaning), ctx_callgraph (callers), ctx_knowledge / ctx_session (memory).
OUTPUT STYLE: expert-terse
- Telegraph format: subject-verb-object, drop articles/prepositions
- Symbolic vocabulary: → cause, ∵ because, ∴ therefore, ⊕ add, ⊖ remove, Δ change, ≈ similar, ≠ different, ∈ in/member, ∅ empty/none, ✓ ok, ✗ fail
- Code blocks: untouched (never compress code syntax)
- Each line: max 80 chars
- Zero narration, zero filler
- BUDGET: ≤100 tokens per non-code response
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.
- yesterday First seen · 17 lines · 253 tokens per session scan A e0b8c6d1b249
lean-ctx copilot-instructions.md is an instructions file published in the GitHub repository yvgude/lean-ctx (3,681 stars, last pushed yesterday), licensed Apache-2.0. It adds 253 tokens to every session, about $0.0013 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 2026-08-30.
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