AegisGitea-MCP/docs/deployment.md

# Deployment

This page covers running the HTTP server for remote clients. For a local stdio setup see
[getting-started.md](getting-started.md). Read [hardening.md](hardening.md) as well: this server
hands the power of its Gitea token to every client that can authenticate.

## Choose a mode

- Admin-token only: set `GITEA_TOKEN` and `MCP_BEARER_TOKEN`. Every client with the bearer token
  acts as the token owner.
- Per-user OAuth: additionally set `OAUTH_ENABLED=true` with the OAuth settings. Users sign in
  with their own Gitea account and act under their own permissions. The static bearer keeps
  working next to it as the admin identity; leave `MCP_BEARER_TOKEN` unset to turn that off.

## Docker

Image: `git.hiddenden.cafe/hiddenden/aegisgitea-mcp`. Tag `dev` is built from the dev branch and
`latest` from main. `uv run aegis-gitea-mcp setup` prints this compose service, with your port:

```yaml
services:
  aegis-gitea-mcp:
    image: git.hiddenden.cafe/hiddenden/aegisgitea-mcp:dev
    restart: unless-stopped
    env_file: .env
    environment:
      MCP_TRANSPORT: http
      MCP_HOST: 0.0.0.0  # allowed because authentication is configured
      DATA_DIR: /var/lib/aegis-mcp
    ports:
      - "127.0.0.1:8080:8080"
    volumes:
      - aegis-mcp-data:/var/lib/aegis-mcp
    read_only: true
    tmpfs:
      - /tmp
    cap_drop:
      - ALL
    security_opt:
      - no-new-privileges:true

volumes:
  aegis-mcp-data:
```

Points that matter:

- Inside the container the server must bind `0.0.0.0` so the published port works. That is
  allowed only because `MCP_BEARER_TOKEN` or OAuth is configured; otherwise it exits with code 2.
- The port is published on `127.0.0.1` only. The reverse proxy on the same host is the public
  entry point.
- `DATA_DIR` must be a persistent volume writable by the container user. It holds the audit log
  and the encrypted OAuth token store (`oauth-tokens.json`, mode 0600). Losing the volume loses
  all OAuth logins and the audit history. Back it up, and protect the backup like the secrets it
  protects.
- Keep `.env` out of version control and out of the image (mode 0600; `setup` writes it that
  way). Compose passes it as environment, so it is visible to `docker inspect` for anyone with
  Docker access.

Check it: `curl http://127.0.0.1:8080/health`.

## Reverse proxy and TLS

Terminate TLS at a reverse proxy. `PUBLIC_BASE_URL` must be the public https URL (it is required
for OAuth, and http is only accepted for loopback hosts). Mistral Le Chat needs a valid public
certificate.

Caddy:

```
gitea-mcp.example.com {
    reverse_proxy 127.0.0.1:8080 {
        flush_interval -1
    }
}
```

nginx: inside the proxying `location`, set `proxy_buffering off;` so streamed responses are not
held back. Also forward `Host` (`proxy_set_header Host $host;`) and keep the default read timeout
in mind for long tool calls.

The server rejects requests whose `Host` is not allowed (DNS-rebinding protection). Allowed hosts
are the loopback names with the port, the host of `PUBLIC_BASE_URL`, and `ALLOWED_HOSTS`. If
you reach it under another name, add that name to `ALLOWED_HOSTS`. With a non-loopback
`MCP_HOST` (the container) and neither `PUBLIC_BASE_URL` nor `ALLOWED_HOSTS`, every remote `Host`
is rejected with 421, and the server logs a warning at startup naming the two variables.

The server trusts `X-Forwarded-For` only from `FORWARDED_ALLOW_IPS` (default `127.0.0.1`). When
the proxy reaches the container from another address, for example a Docker network, add that
address or network (`FORWARDED_ALLOW_IPS=172.18.0.0/16`). Without it every request looks like it
comes from the proxy and shares one per-IP rate limit bucket. `*` trusts any peer, so use it only
when the port is reachable solely from the proxy.

## OAuth application in Gitea

`setup --public-base-url https://gitea-mcp.example.com` registers the application for you as the
admin's user application. To do it by hand: in Gitea open Settings, Applications, Manage OAuth2
Applications, create an application named `aegis-gitea-mcp` as a confidential client with the
redirect URI `https://gitea-mcp.example.com/oauth/callback`, and put the client id and secret in
`GITEA_OAUTH_CLIENT_ID` and `GITEA_OAUTH_CLIENT_SECRET`. Then set `OAUTH_ENABLED=true`,
`PUBLIC_BASE_URL` and `TOKEN_ENCRYPTION_KEY` (at least 32 characters, `openssl rand -hex 32`).

Gitea has no instance-wide OAuth application API, so the application belongs to the admin account
that created it. Re-running setup reuses it; if the stored client secret is missing, Gitea has to
regenerate it, and setup asks before doing so.

`OAUTH_SCOPES` is the scope list sent to Gitea. Keep it to granular scopes. Narrow it (for
example to `read:repository,read:issue`) to limit what signed-in users' tokens can do through this
server regardless of their Gitea rights.

## Upgrades

- Application: pull the new image (or package) and restart. The data volume is kept.
- `TOKEN_ENCRYPTION_KEY` must stay the same, or stored OAuth logins can no longer be decrypted
  and users have to sign in again.
- Upgrading Gitea: tool names and schemas come from the pinned swagger, so a Gitea upgrade does
  not change them. To pick up a newer API, re-pin the swagger and regenerate the catalog:

  ```bash
  curl -fsS https://git.example.com/swagger.v1.json -o spec/gitea-swagger.v1.json
  uv run python scripts/generate_catalog.py
  uv run python scripts/check_docs.py --write
  uv run pytest
  ```

  Review the diff of `tools.json` and `docs/tools.md`: renamed or removed operations change tool
  names. Until the new spec is pinned, `gitea_api_request` reaches new endpoints.

## CI

The workflows in `.gitea/workflows/` lint, test and build. The `docs-check` job runs
`uv run python scripts/check_docs.py`, which fails when `docs/tools.md` or the README tool summary
is stale, or when a document names a tool that does not exist. `scripts/generate_catalog.py
--check` fails when `tools.json` does not match the pinned swagger.