Tently MCP: AI pull request review, inside your coding agent

Tently is an AI code reviewer for GitHub pull requests. It catches the two things diff-only reviewers miss: regressions in code that depends on the change, and changes that break design decisions your team made on purpose. It learns those decisions from your merged pull requests, review threads and docs, and checks every pull request against them.

This repo is Tently's MCP server: the same decisions, inside Claude Code, Cursor or Codex while the agent writes code, before a pull request exists.

How the pieces fit

Tently is one decision store with two gates:

Gate	When	What it does
Pull request review (GitHub App)	Every PR	Posts a check run and inline comments for regressions and decision drift, with the evidence attached
This MCP server	While the agent writes	Lets the agent look up the decisions that apply and the blast radius of a change

The MCP server needs a Tently workspace. Request early access at tently.dev.

Set up

Create an API key on the Connect page at app.tently.dev, then run this from your repo root:

npx @tently/mcp init --agent claude --api-key <your key>

Or pass the key through the environment:

TENTLY_API_KEY=<your key> npx @tently/mcp init

init adds the tently server to .mcp.json (Claude Code) or .cursor/mcp.json (Cursor), and installs a small skill that tells the agent when to use it. It backs up any file before editing it, keeps your other MCP servers, and prints every change. Restart your agent afterwards.

--agent takes claude, cursor, both or auto (the default, which detects what's in the repo).

Manual config

json

{
  "mcpServers": {
    "tently": {
      "command": "npx",
      "args": ["-y", "@tently/mcp", "mcp"],
      "env": { "TENTLY_API_KEY": "<your key>" }
    }
  }
}

What the agent gets

search_decisions: the decisions that apply to the code it's about to change, from your Tently workspace. Each one says whether breaking it is blocking or advisory.
query_impact_zone: the blast radius of a symbol (who calls it, what it depends on), computed locally on your checkout with CodeGraph. Your source code never leaves your machine. The index lives in .codegraph/, which init adds to .gitignore.

Impact results are evidence, not proof: callers reached through interfaces, dynamic dispatch or re-exports can be missed, and the tool says so in its output.

Configuration

Variable	Meaning
`TENTLY_API_KEY`	Workspace API key (required for `search_decisions`)
`TENTLY_API_URL`	API origin, default `https://api.tently.dev`
`TENTLY_WORKING_DIR`	Directory `query_impact_zone` indexes, default the current directory

Privacy

search_decisions sends your query text and the file paths you pass to the Tently API. Nothing else leaves your machine: query_impact_zone runs entirely locally. See tently.dev for how Tently handles data.

Development

npm install
npm test
npm run build
node dist/cli.js mcp   # start the server on stdio

Requires Node.js 20 or later.

Contributing

Issues and pull requests are welcome. For anything beyond a small fix, please open an issue first so we can agree on the approach.

License

MIT

What it does

What it costs