Borrowing it
Nothing to install: this file belongs to Nano-Nimbus/locus. 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/Nano-Nimbus/locus/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/Nano-Nimbus/locusWrote 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/nano-nimbus/locus/copilot-instructions)<a href="https://agentmods.dev/instructions/nano-nimbus/locus/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/nano-nimbus/locus/copilot-instructions/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/nano-nimbus/locus/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/nano-nimbus/locus/copilot-instructions.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 | $0.00840 | $0.00840 |
| Opus 5.5 | $0.00336 | $0.00336 |
| Sonnet 5.5 | $0.00168 | $0.00168 |
| Haiku 4.5 | $0.00084 | $0.00084 |
Grade A, and why
locus 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 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.
How it starts
The opening of the file, as written. The whole thing — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Locus is a hierarchical markdown memory system for AI agents. Core invariant: load only what you need. All changes must preserve minimal-context semantics and agent-agnostic compatibility.
Security invariants — flag any violation
TaintTracker.session_taintedis a one-way latch. Flag any code that clears, resets, or conditionally bypasses it within a session. There is no safe in-session reset.auto_sign_writesmust default toFalseinSigningConfig. ATruedefault enables taint laundering.safe_resolve()andassert_writable()inpalace.pymust be called before every filesystem read/write. Flag any path that bypasses them, including new helper functions.- Write-blocked dirs (
.sig/,.security/,sessions/,_metrics/,archived/) must be checked at every depth in the path, not justparts[0]. locus/security/must not import fromlocus/mcp/. Shared utilities belong inlocus/utils.pyto avoid circular dependencies.- Signing protocol payload (
locus-sig-v1\n<slug>\n<path>\n<signed_at>\n<sha256>) is versioned. Flag any modification to this format without a protocol version bump.
MCP tool contracts
The five tool signatures (memory_list, memory_read, memory_write, memory_search, memory_batch) are stable — changes to parameter names, types, or return shapes are breaking. FastMCP guard errors return isError=True tool results, not Python exceptions. Flag try/except around tool calls that expect exceptions from guard violations.
Python correctness
- Flag
((var++))in bash scripts running underset -e— post-increment returns the old value, which exits on zero. Usevar=$((var + 1))instead. - Flag broad
except Exceptionwithout re-raise or meaningful log context. - Flag raw string path manipulation — all paths must use
pathlib.Path. - Flag
# type: ignorewithout an explanatory comment. - Flag manual
@pytest.mark.asyncio— the project usesasyncio_mode = "auto"globally. - Flag any write to
sys.stdoutin server code — stdout is the MCP wire protocol in stdio transport. All logging must usesys.stderr.
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 First seen · 50 lines · 840 tokens per session scan A 4c9a68dde86a
locus copilot-instructions.md is an instructions file published in the GitHub repository Nano-Nimbus/locus (0 stars, last pushed 1mo ago), licensed MIT. It adds 840 tokens to every session, about $0.0034 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 2026-08-31.
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