codeviewer-mcp

codeviewer-mcp is a TypeScript MCP server for stateful, AST-aware code review workflows.

It is designed for clients that can run MCP servers over STDIO (local command execution) and call tools in iterative review loops.

What this repository provides

• A local MCP server process (dist/index.js) that exposes review tools
• Stateful review sessions stored in SQLite
• AST-based context localization for JS/TS code
• Deterministic preflight checks (TypeScript diagnostics + basic security pattern checks)
• Structured review output with verdicts, categorized feedback, and optional search/replace patch suggestions

MCP tools exposed by the server

1) register_plan

Registers a review session and its ordered plan steps.

Input:

• project_path (optional string)
• steps (string array, required, at least 1)

Output:

• session_id (UUID)
• steps_registered (number)
• status (ACTIVE)

2) review_code_chunk

Reviews one code chunk against a specific plan step.

Input:

• session_id (UUID)
• plan_step (positive integer)
• target_file (string)
• code_chunk (string)
• modification_type (INSERT | MODIFY | DELETE | REPLACE)
• target_node (optional string)
• active_skills (optional string array)

Output:

• verdict (PASS or NEEDS_WORK)
• critical_issues (number)
• feedback (array)
• patches (array)
• plan_step_status (PENDING | IN_PROGRESS | VALIDATED)

Runtime behavior

• On startup, the server initializes a SQLite database (default: .codeviewer-mcp.sqlite in project root).
• For each review_code_chunk request, the server:
  1. Validates the session and plan step
  2. Re-indexes project AST context
  3. Runs preflight checks on the submitted chunk
  4. Produces a structured review response
  5. Logs chunk + review data and updates plan step status

Requirements

• Node.js 20+ (recommended)
• npm
• Build tools required by native Node modules (for better-sqlite3)

Installation (manual/local)

This repository is intended to run as a local MCP server process.

1. Clone the repository

git clone https://github.com/Master0fFate/codeviewer-mcp.git
cd codeviewer-mcp

2. Install dependencies

npm install

3. Build

npm run build

4. Start server

npm start

Development mode (no prebuild step):

npm run dev

Environment variables

• MCP_PROJECT_PATH (optional): project root used for AST indexing. Defaults to current working directory.
• MCP_REVIEWER_DB_PATH (optional): SQLite DB path. Defaults to <MCP_PROJECT_PATH>/.codeviewer-mcp.sqlite.

Example:

MCP_PROJECT_PATH=/absolute/path/to/target/repo \
MCP_REVIEWER_DB_PATH=/absolute/path/to/reviewer.sqlite \
node dist/index.js

Installing into MCP clients / LLM harnesses

The server uses STDIO transport, so integration is done by registering a local command.

Canonical command

Use this command in your MCP client configuration:

node /absolute/path/to/codeviewer-mcp/dist/index.js

Recommended args/env form:

{
  "command": "node",
  "args": ["/absolute/path/to/codeviewer-mcp/dist/index.js"],
  "env": {
    "MCP_PROJECT_PATH": "/absolute/path/to/target/project",
    "MCP_REVIEWER_DB_PATH": "/absolute/path/to/target/project/.codeviewer-mcp.sqlite"
  }
}

Claude Code

1. Open your Claude Code MCP/server configuration file.
2. Add a new server entry using the canonical STDIO command.
3. Set MCP_PROJECT_PATH to the repository Claude Code should review.
4. Save config and restart Claude Code.
5. Confirm the server appears and exposes register_plan and review_code_chunk.

Example server block:

{
  "name": "codeviewer-mcp",
  "command": "node",
  "args": ["/absolute/path/to/codeviewer-mcp/dist/index.js"],
  "env": {
    "MCP_PROJECT_PATH": "/absolute/path/to/repo"
  }
}

OpenCode

1. Open OpenCode MCP settings.
2. Register a new STDIO MCP server named codeviewer-mcp.
3. Point command/args to your built dist/index.js.
4. Provide MCP_PROJECT_PATH in environment settings.
5. Restart OpenCode and validate tool discovery.

Example entry:

{
  "mcpServers": {
    "codeviewer-mcp": {
      "command": "node",
      "args": ["/absolute/path/to/codeviewer-mcp/dist/index.js"],
      "env": {
        "MCP_PROJECT_PATH": "/absolute/path/to/repo"
      }
    }
  }
}

Droid(factory)

1. Open Droid(factory) MCP connector configuration.
2. Add a local STDIO server entry.
3. Use node as command and dist/index.js as the argument.
4. Configure environment variables for project/database paths.
5. Restart Droid(factory) runtime and verify tool availability.

Use the canonical JSON block shown above.

Kilo Code CLI

1. Open Kilo Code CLI MCP configuration.
2. Add a new server alias (for example codeviewer-mcp).
3. Register the same STDIO launch command.
4. Set MCP_PROJECT_PATH for the target repository.
5. Restart the CLI session and list MCP tools to confirm connection.

Use the canonical JSON block shown above.

Note: client config schema and config file location can vary by version. If your MCP client expects different key names, map the same command/args/env values into its schema.

Verification checklist after integration

• Server process starts without error
• Client shows connected MCP server
• Tools discovered:
  • register_plan
  • review_code_chunk
• A sample register_plan call returns a session_id
• A sample review_code_chunk call returns a structured verdict

Development and validation

Run tests:

npm test

Build:

npm run build

Repository layout

• /src/index.ts - process entrypoint and STDIO transport
• /src/server.ts - MCP server + tool registration
• /src/schemas.ts - zod schemas for tool contracts
• /src/state.ts - SQLite state store
• /src/ast.ts - AST indexing and context localization
• /src/preflight.ts - static preflight checks
• /src/reviewer.ts - review decision + output shaping
• /tests - vitest test suite
• /prompts/universal-auditor-general-v2.1.md - audited prompt artifact

License

MIT