Arm Code MCP server

arm-code-mcp

An MCP server that helps AI assistants optimize Linux workloads on Arm64. It parses perf report output, recommends NEON SIMD intrinsics for hot loops, and audits Python dependency manifests for arm64 wheel availability — all offline, all structured, all callable from Claude Code, GitHub Copilot, and Codex.

What's inside

• analyzeperfoutput — parse perf report --stdio into a ranked list of hot symbols
• suggestneonintrinsic — semantic + keyword search over 110 curated NEON intrinsics
• checkarm64deps — flag packages in requirements.txt, pyproject.toml, or Dockerfile that lack arm64 wheels or require special handling

Prerequisites

• Docker
• An MCP-compatible AI assistant (Claude Code, GitHub Copilot, Codex)

Quick start

docker pull jeannjohnson/arm-code-mcp:latest

Add to your MCP client config (e.g. ~/.claude/mcp.json):

{
  "mcpServers": {
    "arm-code-mcp": {
      "command": "docker",
      "args": ["run", "--rm", "-i", "jeannjohnson/arm-code-mcp:latest"]
    }
  }
}

Restart your client. All three tools are now available.

Tools

analyzeperfoutput

Parse raw perf report --stdio output and return the top hot symbols, ranked by overhead.

analyze_perf_output(
    perf_report_text: str,          # raw stdout of `perf report --stdio`
    top_n: int = 10,                # max symbols to return
    min_overhead_pct: float = 0.5,  # ignore symbols below this %
) -> dict

Example response:

{
  "summary": {
    "total_samples": 5432100,
    "total_events": null,
    "command": "myapp"
  },
  "hot_symbols": [
    {"overhead_pct": 24.17, "samples": 1245, "command": "myapp",
     "module": "myapp", "symbol": "process_buffer"},
    {"overhead_pct": 12.34, "samples": 636, "command": "myapp",
     "module": "libc-2.31.so", "symbol": "__memcpy_avx_unaligned_erms"}
  ],
  "warnings": []
}

suggestneonintrinsic

Recommend NEON intrinsics for a hot loop using hybrid semantic + exact-name retrieval over a curated knowledge base of 110 intrinsics.

suggest_neon_intrinsic(
    operation_description: str,    # e.g. "32-bit float multiply-accumulate"
    target_arch: str = "armv8-a",  # "armv8-a" | "armv8.2-a" | "armv9-a"
    top_k: int = 5,
) -> dict

Example response:

{
  "matches": [
    {
      "intrinsic": "vmlaq_f32",
      "signature": "float32x4_t vmlaq_f32(float32x4_t a, float32x4_t b, float32x4_t c)",
      "header": "<arm_neon.h>",
      "min_arch": "armv8-a",
      "description": "Multiply-accumulate: a + (b * c), lane-wise, 4x f32.",
      "score": 0.9142
    }
  ],
  "notes": "Filtered to armv8-a. KB contains 110 entries (103 compatible)."
}

checkarm64deps

Scan a dependency manifest and flag packages with known arm64 compatibility issues. Fully offline — no network calls, fast, deterministic.

check_arm64_deps(
    file_content: str,                    # raw text of the manifest
    file_type: str = "requirements.txt",  # "requirements.txt" | "pyproject.toml" | "Dockerfile"
) -> dict

Example response:

{
  "checked": ["numpy", "tensorflow", "cupy-cuda12x", "faiss-cpu", "requests"],
  "issues": [
    {"package": "cupy-cuda12x", "severity": "error",
     "message": "GPU-only package with no arm64 wheel. Use cupy with ROCm or a CPU fallback."},
    {"package": "tensorflow", "severity": "warning",
     "message": "Official TensorFlow PyPI wheels are x86-only before 2.10; use tensorflow-aarch64 or build from source."},
    {"package": "faiss-cpu", "severity": "warning",
     "message": "No official arm64 wheel on PyPI; build from source or use the conda-forge package."},
    {"package": "numpy", "severity": "info",
     "message": "arm64 wheels available from PyPI since 1.21.0. Ensure version >= 1.21.0."}
  ],
  "summary": "Checked 5 package(s): 1 error(s), 2 warning(s), 1 info(s)."
}

Severity levels:

Shortened. The full README is on GitHub.