DevInsight MCP

A lightweight Model Context Protocol (MCP) server that gives Claude the ability to inspect, analyze, and grade local Git repositories.

Built with Anthropic's official Python MCP SDK, DevInsight demonstrates all three MCP primitives — Tools, Resources, and Prompts — through practical developer workflows: language stats, TODO tracking, git history, large-file detection, an overall repo health score, and technology-stack fingerprinting.

---

Demo

A live session driving the DevInsight tools against this very repository — repo stats, TODO scan, and large-file detection.

---

✨ Features

• 📊 Repository statistics — languages, file counts, line counts
• 📝 Scan projects for TODO, FIXME, HACK, and XXX
• 📜 Summarize recent Git commits (author, date, message, +/- lines)
• 📁 Detect oversized source files that are due for a refactor
• 🩺 Score overall repository health (README/LICENSE/tests/git, TODO density, file size) with concrete recommendations
• 🧰 Fingerprint a project's tech stack — languages, frameworks, databases, package managers, CI/CD, deployment
• 🌳 Browse repositories through an MCP Resource
• 🤖 Review and prioritize TODOs using an MCP Prompt

Scanning automatically skips noise: .git, .github, node_modules, virtualenvs, build/cache directories, lock files, and binary assets — see Repository Scanning below.

---

Why DevInsight?

Developers spend a surprising amount of time manually inspecting repositories:

• searching for TODOs
• checking Git history
• counting files
• finding oversized modules
• judging whether a project is in good shape before diving in

DevInsight exposes these tasks as MCP tools so Claude can perform them for you, directly in conversation.

Instead of manually searching your project, you can simply ask:

"Summarize the last 10 commits."

"Find every TODO and tell me which ones are most important."

"Which files are becoming too large?"

"How healthy is this repo, and what should I fix first?"

"What's the tech stack of this project?"

---

Installation

Clone the repository

git clone https://github.com/AzalHoseinian/devinsight-mcp.git
cd devinsight-mcp

Create a virtual environment

python3 -m venv .venv
source .venv/bin/activate

Windows:

.venv\Scripts\activate

Install dependencies

pip install -r requirements.txt

Run the tests

pip install pytest
python -m pytest -q

Install as a command (optional)

From a clone, inside your virtual environment:

pip install .
devinsight-mcp        # runs the server over stdio

(Publishing to PyPI is planned; until then install from the clone.)

Try it with the MCP Inspector

The easiest way to test the server standalone is with the official MCP Inspector:

mcp dev server.py

The Inspector lets you invoke every Tool, inspect Resources, test Prompts, and debug raw responses — all in the browser, no client app required.

---

Claude Desktop Setup

Add DevInsight to your claude_desktop_config.json:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "devinsight": {
      "command": "/absolute/path/to/devinsight-mcp/.venv/bin/python3",
      "args": [
        "/absolute/path/to/devinsight-mcp/server.py"
      ]
    }
  }
}

If you installed the command with pip install ., you can point Claude Desktop at it instead:

{
  "mcpServers": {
    "devinsight": {
      "command": "/absolute/path/to/devinsight-mcp/.venv/bin/devinsight-mcp"
    }
  }
}

Using the virtual environment's Python interpreter (rather than a bare python) ensures Claude Desktop finds the mcp package regardless of what's active in your shell.

Fully quit and reopen Claude Desktop afterwards — it only reads this file on startup. Then try:

Use repo_stats on ~/projects/my-app

or

Review all TODOs in this repository.

---

Security notes

DevInsight is read-only: it never writes, deletes or executes anything from the repositories it scans. The only external command it runs is git log with a fixed argument list.

It can, however, read any path you give it that your user account can read, so only connect it to clients you trust. It does not follow symlinked directories when drawing the tree, and it skips lock files and binaries in statistics.

---

Available Tools

Primitive	Name	Purpose
Tool	repo_stats	Language and line-count breakdown
Tool	find_todos	Find TODO / FIXME / HACK / XXX comments
Tool	git_log_summary	Summarize recent Git activity
Tool	find_large_files	Detect files exceeding a configurable size
Tool	repo_health	Overall 0-100 health score with recommendations
Tool	tech_stack	Detect languages, frameworks, databases, package managers, CI/CD, deployment
Resource	repo://tree/{path}	Render the repository tree
Prompt	review_todos	Ask Claude to prioritize TODOs

Usage examples

repo_stats(path="~/projects/my-app")
→ { "total_files": 142, "total_lines": 18734,
    "by_extension": { ".ts": {...}, ".tsx": {...}, ... } }

find_todos(path=".", max_results=50)
→ [ { "file": "src/api.ts", "line_number": 42,
      "tag": "TODO", "text": "handle retry backoff" }, ... ]

git_log_summary(path=".", count=5)
→ { "commits": [ { "hash": "a1b2c3d4", "author": "...", 
      "date": "2026-07-10", "message": "...", 
      "insertions": 12, "deletions": 3 }, ... ] }

find_large_files(path=".", threshold_lines=300)
→ [ { "file": "src/legacy/parser.py", "lines": 812 }, ... ]

repo_health(path=".")
→ { "score": 78,
    "checks": { "has_git": true, "has_readme": true,
                "has_license": true, "has_tests": false },
    "recommendations": [ "Add a test suite ..." ] }

tech_stack(path=".")
→ { "languages": ["Python"], "frameworks": ["FastAPI"],
    "databases": ["PostgreSQL"], "package_managers": ["pip"],
    "ci_cd": ["GitHub Actions"], "deployment": ["Docker"] }

---

Repository Scanning

Statistics tools (repo_stats, find_todos, find_large_files, repo_health) walk the repo while pruning directories as they go — ignored subtrees are never descended into.

Ignored directories: .git, .github, node_modules, venv, .venv, env, __pycache__, dist, build, .next, .nuxt, .svelte-kit, .idea, .vscode, target, coverage, htmlcov, .pytest_cache, .mypy_cache, .cache

Excluded from statistics: lock files (package-lock.json, pnpm-lock.yaml, yarn.lock, poetry.lock, Cargo.lock, Gemfile.lock, composer.lock, uv.lock, bun.lockb) and binary assets (.png, .jpg, .jpeg, .gif, .pdf, .zip, .exe, .dll) — these are real project content, but noise in line/size stats.

tech_stack looks at these same files directly, since a lock file's mere presence is a useful package-manager signal.

---

Architecture

               Claude Desktop
                      │
                      ▼
             DevInsight MCP Server
                      │
      ┌───────────────┼───────────────┐
      ▼               ▼               ▼
 Git Repository   File System     Git History

---

Project Structure

devinsight-mcp/
├── devinsight_mcp.py      # implementation (installed as the `devinsight-mcp` command)
├── server.py              # thin launcher for `mcp dev server.py`
├── tests/
├── .github/workflows/test.yml
├── pytest.ini
├── requirements.txt
├── pyproject.toml
├── README.md
├── docs/
│   ├── demo.gif
│   ├── demo.tape
│   └── demo_cli.py
└── .gitignore

---

Roadmap

• Repository statistics
• TODO scanner
• Git history summaries
• Large file detection
• Repository tree resource
• TODO review prompt
• Overall repo health score
• Tech stack detection
• Test suite and CI
• Optional allowlist of readable root directories
• Lint summary tool
• GitHub Issues integration
• Dependency vulnerability analysis
• Pull request insights

---

Tech Stack

• Python
• Anthropic MCP Python SDK
• Git
• Claude Desktop
• Model Context Protocol (MCP)

---

Contributing

Contributions, suggestions, and feedback are welcome.

If you'd like to improve DevInsight, feel free to open an issue or submit a pull request.

---

License

MIT — see LICENSE.