What is nimbus-mcp CLAUDE.md?

Repository-specific instructions for Nimbus MCP, a launcher that exposes a locally installed Nimbus index and its agents to MCP clients. MCP is a standard connection between AI tools and external services.

They help an agent understand the package’s role, commands, technology stack, and relationship to the Nimbus monorepo—a repository containing multiple related packages.

They clarify that this package only finds and starts the Nimbus program, while the actual MCP server and its tools live in another repository.

How nimbus-agent/nimbus-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to nimbus-agent/nimbus-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.

Copy the file

curl -O https://raw.githubusercontent.com/nimbus-agent/nimbus-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/nimbus-agent/nimbus-mcp

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/nimbus-agent/nimbus-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/nimbus-agent/nimbus-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/nimbus-agent/nimbus-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/nimbus-agent/nimbus-mcp/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/nimbus-agent/nimbus-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/nimbus-agent/nimbus-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,379 This file is loaded in full into every session.

When invoked 1,379 The same file — it is already loaded in full.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.01379	$0.01379
Opus 5	$0.00690	$0.00690
Sonnet 5	$0.00276	$0.00276
Haiku 4.5	$0.00138	$0.00138

Measured 8d ago against content hash 356aeabd4960, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

nimbus-mcp CLAUDE.md scanned grade A with 1 finding 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 8d 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

`curl -s -o /dev/null -w '%{http_code}' -L <url>`; the site serves real 404s, so the

CLAUDE.md · 87 lines

How it starts

The opening of the file, as written. The whole thing — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.

nimbus-mcp — Claude Code Context

What this is

@nimbus-dev/mcp — the MIT-licensed launcher that exposes a locally-installed Nimbus index and its agents to any MCP client. It does no work itself: it locates the nimbus binary already on the machine and execs it as nimbus mcp-server --stdio, then passes stdio straight through.

The MCP server is not in this repo. It lives in the AGPL monorepo at packages/cli/src/commands/mcp-server.ts + packages/cli/src/mcp/, and serves 21 tools: nine read-only index tools (INDEX_TOOL_SPECS) plus twelve agent-classified ones (AGENT_CLASSIFIED_TOOL_SPECS — the eleven AGENT_TOOL_SPECS entries plus peekWhy). This package only knows how to find the binary — never how to run the gateway. Re-derive that split from packages/cli/src/mcp/adapter.ts before restating it: only the TOTAL is pinned over there (adapter.test.ts: expect(TOOL_SPECS).toHaveLength(21)), so the split drifts silently — "six index tools" was stated here, and is still stated in adapter.ts's own buildMcpServer doc comment, long after the list grew to nine.

Stack

Runtime: Bun v1.2+ · Language: TypeScript 7.x strict · Linter: Biome
Zero runtime dependencies. Not "few" — zero. package.json has devDependencies only. Adding a runtime dep is a licence and supply-chain decision, not a convenience call.
No any — use unknown for external data; strict mode is non-negotiable.

Commands

bun run typecheck      # tsc --noEmit
bun run lint           # biome check .
bun run test           # bun test
bun run test:coverage  # lcov -> coverage/lcov.info; what the SonarCloud gate consumes
bun run build          # dist/index.js (ESM, node target)

Cross-repo relationships

Nimbus — the gateway/CLI monorepo. Owns the MCP server this launcher starts, and owns the installer whose output directories src/installer-contract.ts vendors. This package was extracted from it (packages/mcp-launcher) on 2026-08-20.

Read the full file on GitHub · 87 lines

Changes

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.

8d ago First seen · 87 lines · 1,379 tokens per session scan A 356aeabd4960

Subscribe to this mod's changes

nimbus-mcp CLAUDE.md is an instructions file published in the GitHub repository nimbus-agent/nimbus-mcp (0 stars, last pushed 4d ago), licensed MIT. It adds 1,379 tokens to every session, about $0.0069 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Building agents

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.

vercel/next.js · 7,296 tokens

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.

openai/codex · 5,153 tokens

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).

microsoft/vscode · 6,785 tokens

nimbus-mcp: Instructions file for Claude Code