GitOps Safe MCP

A deliberately narrow stdio MCP server extracted from spectrenet-mcp commit 2e63f009d8f4642e17398685baef0251811d6637. It exposes only:

• repository_status: Git status and five recent commits (read-only).

• diff_summary: unstaged diff statistics and working-tree names (read-only).

• tofu_validate: tofu fmt -check -recursive and tofu validate -no-color.

• ansible_syntax: one contained YAML playbook through a pinned/operator-managed ansible-playbook --syntax-check command.

There are no Git write, OpenTofu plan/apply, Ansible playbook-run, shell, or arbitrary-command tools.

Important Ansible warning

Ansible syntax-check is not guaranteed to be inert: lookup plugins and some collection/plugin loading can execute code while parsing a playbook. Treat the configured repository and dependencies as trusted code. Run this server under a dedicated unprivileged account, with a scrubbed environment, read-only repository mount, no production credentials, and restricted network/filesystem access. The executable must be configured as an absolute operator-managed path (or an absolute operator-owned wrapper); it is never accepted from a tool argument.

Related MCP server: Gumi-MCP

Safety boundaries

All configured child paths and requested playbooks are resolved (including symlinks), must be relative, must exist, and must remain strictly below their allowed resolved root. Every subprocess receives the same explicit minimal allowlist (PATH, basic user/locale/terminal/temp variables, and XDG_*); Ansible alone additionally receives the contained ANSIBLE_CONFIG. Unrelated process credentials, cloud tokens, and provider secrets are not inherited. Subprocesses use argv arrays, fixed verbs/flags, timeouts, and bounded stdout/stderr. Audit JSONL includes timestamp, UUID request ID, tool/target, non-mutating marker, exit code, timeout status, and duration—but not command output or environment values.

This is defense in depth, not a sandbox. See Security and Architecture.

Install and run

Python 3.11+ and uv are recommended:

uv sync --extra test
cp .env.example .env.reference  # reference only; the package does not load dotenv files
uv run gitops-safe-mcp

Inject settings with a service manager or secret/configuration manager. Ensure the audit directory is writable only by the service/operator.

Verify

uv run --extra test pytest
uv run python -m compileall -q src tests
uv build

Tests use temporary fake repositories and fake executables. They do not run OpenTofu or Ansible against real infrastructure.