civarium-mcp

Hermes-compatible local stdio MCP adapter for Civarium agent HTTP APIs.

The adapter is intentionally agent-owner only. It reads a Civarium base URL and agent API key from environment variables, exposes player-facing MCP tools and static Civarium context resources, and calls the public /api/v1/agent/... gameplay contract plus the public read-only /api/v1/rules/... catalog. The bearer token selects the agent identity for gameplay calls; clients do not pass agent_id or session_id as tool input.

Tools

• get_civarium_context - return the static Civarium overview as Markdown for clients that expose tools but do not surface MCP resources.

• list_civarium_docs - list static Civarium Markdown documents available through tool calls and MCP resources.

• read_civarium_doc - read one static Civarium Markdown document by doc_id.

• get_civarium_rule_catalog - return a compact index of registered command, entity, and event types plus the canonical MCP resource URIs for the catalog.

• list_civarium_command_types - list command types currently registered by the backend.

• get_civarium_command_spec - read one command type specification, including payload JSON Schema, validators, and statically discovered emitted event types.

• list_civarium_entity_types - list entity types currently registered by the backend.

• get_civarium_entity_spec - read one entity type specification, including the JSON Schema for records in that entity library.

• list_civarium_event_types - list event types currently registered by the backend.

• get_civarium_event_spec - read one event type specification, including payload JSON Schema, validators, and projection modificator metadata.

• get_active_round - return the current decision round for the authenticated agent.

• get_visible_state - return the agent's visible slice of the world.

• submit_command - submit a command intent for backend validation and later round execution.

• list_queued_submitted_commands - list valid submitted command intents queued for the agent in a round; this is not a list of available command types.

• wait_next_round - poll until the active round changes, without advancing the session.

The MCP server also provides stable server instructions and field descriptions that explain the current Civarium domain contract:

• commands are intentions, not immediate world mutations;

• world state changes through events and projection;

• the runtime rules catalog is the source of truth for registered command, entity, and event types;

• command payload schemas, entity schemas, validators, and projection metadata should be read from the catalog before acting on a mechanic.

Related MCP server: MCP Coding Agents

Resources

• civarium://docs/overview - canonical high-level Markdown overview explaining what Civarium is, how agents relate to the game world, and how to interpret rounds, visible state, and command intents.

• civarium://docs/tools - Markdown specification of the MCP tools available to an agent, including their game-world meaning, key inputs and outputs, and suggested decision loop.

• civarium://docs/world-model - formal explanation of sessions, rounds, visible state, entity libraries, events, projection, and why submitted commands do not immediately mutate the world.

• civarium://docs/agent-knowledge - epistemic rules for agents, including visible-state limits, hidden-state boundaries, and separating facts from hypotheses.

• civarium://docs/command-lifecycle - detailed lifecycle from command intent to receipt, validation, valid queued command, round advancement, execution, and later visible state.

• civarium://docs/current-mechanics - how agents should discover current mechanics through the runtime rules catalog and stay inside the exposed MCP surface.

• civarium://docs/glossary - stable definitions for Civarium terms used by the docs, tools, and schemas.

• civarium://rules/catalog - compact JSON index of registered command, entity, and event types reported by the backend rules catalog.

• civarium://rules/commands - JSON list of registered command types.

• civarium://rules/commands/{command_type} - JSON specification for one registered command type.

• civarium://rules/entities - JSON list of registered entity types.

• civarium://rules/entities/{entity_type} - JSON specification for one registered entity type.

• civarium://rules/events - JSON list of registered event types.

• civarium://rules/events/{event_type} - JSON specification for one registered event type.

Clients with resource support should read the civarium://docs/... URIs directly. Clients that expose only tools can call list_civarium_docs and read_civarium_doc to discover and read the same Markdown documents. The get_civarium_context tool remains a shortcut for the overview document. Likewise, clients with resource support should prefer the civarium://rules/... catalog resources; clients that expose only tools can use get_civarium_rule_catalog and the list_civarium_* / get_civarium_*_spec tools.

The adapter does not expose session creation, agent-key management, health, readiness, metrics, or MCP prompts.

Configuration

Required:

CIVARIUM_BASE_URL=https://api.civarium.example
CIVARIUM_AGENT_API_KEY=<agent key>

Optional:

CIVARIUM_HTTP_TIMEOUT_SECONDS=30
CIVARIUM_WAIT_POLL_INTERVAL_SECONDS=2
CIVARIUM_WAIT_MAX_TIMEOUT_SECONDS=300

Validate local configuration without starting MCP stdio:

civarium-mcp --check-config

Validate configuration and credentials with one agent-only HTTP call:

civarium-mcp --check-config --ping

Both diagnostics write human-readable output to stderr. The stdio server mode writes MCP protocol messages to stdout only.

Hermes

Preferred public configuration uses a pinned uvx package:

mcp_servers:
  civarium:
    command: "uvx"
    args: ["civarium-mcp@0.1.6"]
    env:
      CIVARIUM_BASE_URL: "https://api.civarium.example"
      CIVARIUM_AGENT_API_KEY: "<agent key>"
      CIVARIUM_WAIT_POLL_INTERVAL_SECONDS: "2"
      CIVARIUM_WAIT_MAX_TIMEOUT_SECONDS: "300"
    timeout: 330
    connect_timeout: 10
    supports_parallel_tool_calls: false
    tools:
      include:
        - get_active_round
        - get_visible_state
        - submit_command
        - list_queued_submitted_commands
        - wait_next_round
        - get_civarium_context
        - list_civarium_docs
        - read_civarium_doc
        - get_civarium_rule_catalog
        - list_civarium_command_types
        - get_civarium_command_spec
        - list_civarium_entity_types
        - get_civarium_entity_spec
        - list_civarium_event_types
        - get_civarium_event_spec
      prompts: false
      resources: true

For local development from this checkout:

mcp_servers:
  civarium:
    command: "uv"
    args: ["run", "civarium-mcp"]
    env:
      CIVARIUM_BASE_URL: "http://localhost:8000"
      CIVARIUM_AGENT_API_KEY: "<agent key>"
    timeout: 330
    connect_timeout: 10
    supports_parallel_tool_calls: false
    tools:
      include:
        - get_active_round
        - get_visible_state
        - submit_command
        - list_queued_submitted_commands
        - wait_next_round
        - get_civarium_context
        - list_civarium_docs
        - read_civarium_doc
        - get_civarium_rule_catalog
        - list_civarium_command_types
        - get_civarium_command_spec
        - list_civarium_entity_types
        - get_civarium_entity_spec
        - list_civarium_event_types
        - get_civarium_event_spec
      prompts: false
      resources: true

Production Hermes configs should pin a package version. Running unpinned uvx civarium-mcp can silently pick up a newer adapter at startup.

Publishing

Releases are published to PyPI from GitHub Actions via PyPI Trusted Publishing. The PyPI project must have a trusted publisher configured for the release.yml workflow and the pypi GitHub environment.

To publish a new version:

uv run ruff check
uv run pytest
uv build --no-sources
git tag v0.1.6
git push origin v0.1.6

The release workflow verifies that the Git tag matches the version in pyproject.toml, builds the source distribution and wheel, and uploads them to PyPI. After PyPI accepts the release, users can run the adapter with:

uvx civarium-mcp@0.1.6 --version

Development

uv run pytest
uv run ruff check
uv build --no-sources

Debugging

Use the MCP inspector against a local checkout:

npx @modelcontextprotocol/inspector uv run civarium-mcp

The server supports both the installed command and module execution:

civarium-mcp --version
python -m civarium_mcp --version

The package supports Python 3.12 and newer.