Borrowing it
Nothing to install: this file belongs to nemanjavlahovic/instruments-mcp-server. 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/nemanjavlahovic/instruments-mcp-server/main/CLAUDE.mdgit clone --depth 1 https://github.com/nemanjavlahovic/instruments-mcp-serverWrote 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/nemanjavlahovic/instruments-mcp-server/claude-md)<a href="https://agentmods.dev/instructions/nemanjavlahovic/instruments-mcp-server/claude-md"><img src="https://agentmods.dev/badge/instructions/nemanjavlahovic/instruments-mcp-server/claude-md.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 5.1 | $0.00480 | $0.00480 |
| Opus 5 | $0.00240 | $0.00240 |
| Sonnet 5 | $0.00096 | $0.00096 |
| Haiku 4.5 | $0.00048 | $0.00048 |
Grade A, and why
instruments-mcp-server 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 7d 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
InstrumentsMCP
What This Is
AI-native performance profiling for iOS and macOS apps. Wraps Xcode Instruments (xctrace CLI) as an MCP server, parsing trace data into structured JSON with severity classifications and actionable summaries.
Architecture
- src/index.ts - MCP server entry point, registers all tools
- src/tools/ - Tool definitions (profile, list, analyze, baseline)
- src/parsers/ - Template-specific XML→JSON parsers (time-profiler, swiftui, allocations, hangs, app-launch, energy, leaks, network)
- src/utils/xctrace.ts - Low-level xctrace CLI wrapper
- src/utils/xml.ts - XML parsing with fast-xml-parser
Key Design Decisions
- Each Instruments template has its own parser with domain-specific heuristics
- Severity classification (ok/warning/critical) uses tuned thresholds per metric type
- The
profile_raw+analyze_tracecombo handles any template without a dedicated parser - Traces are stored in
~/.instruments-mcp/traces/with timestamps
Adding New Parsers
- Create
src/parsers/<template-name>.ts - Export a parse function that takes TOC XML + table XML and returns structured data
- Add a dedicated
profile_<name>tool insrc/tools/profile.ts - Include severity classification and a text summary
xctrace Compatibility
- xctrace 26+ uses Deferred recording mode by default —
time-profiletable may be empty profile_cpuandperformance_auditfall back totime-sampletable automaticallyxctraceExportretries up to 5 times for intermittent "Document Missing Template Error"- XML parser
isArrayconfig wrapsnode,row,frame,backtraceetc. in arrays — always unwrap [0] - xctrace 26 backtrace frames use
@_namefor function names and nestedbinary.@_namefor module
Tech Stack
- TypeScript, Node.js >= 20, ESM modules
- @modelcontextprotocol/sdk for MCP protocol
- fast-xml-parser for XML→JS conversion
- zod for tool parameter schemas
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.
- 7d ago First seen · 37 lines · 480 tokens per session scan A 326b21165e76
instruments-mcp-server CLAUDE.md is an instructions file published in the GitHub repository nemanjavlahovic/instruments-mcp-server (19 stars, last pushed 4mo ago), licensed MIT. It adds 480 tokens to every session, about $0.0024 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.
Other instructions, from other repositories
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 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).
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.
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.
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).
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.