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/nano-nimbus/locus/copilot-instructionsgit 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.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 | $0.00840 | $0.00840 |
| Opus 5 | $0.00420 | $0.00420 |
| Sonnet 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 4d 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.
- 4d 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 5mo ago), licensed MIT. It adds 840 tokens to every session, about $0.0042 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 2026-08-31.
Other instructions, from other repositories
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).
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.
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 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.