# Pallas — FastAgent MCP Bridge

Pallas is the generic runtime that turns [fast-agent](https://github.com/evalstate/fast-agent) agent definitions into StreamableHTTP MCP servers.

It is **completely deployment-agnostic**: all environment-specific values (agent names, ports, hosts, model) live in the calling project's `agents.yaml` and `fastagent.config.yaml`.

---

## Installation

```bash
pip install git+ssh://git@git.helu.ca:22022/r/pallas.git
```

Or as a project dependency in `pyproject.toml`:

```toml
dependencies = [
    "pallas-mcp @ git+ssh://git@git.helu.ca:22022/r/pallas.git",
]
```

---

## Usage

Pallas reads configuration from the **working directory** at runtime.

```
my-project/
├── agents/
│   ├── __init__.py
│   └── jarvis.py          # FastAgent definitions
├── agents.yaml            # Deployment topology
├── fastagent.config.yaml  # FastAgent + model config
└── fastagent.secrets.yaml # API keys (gitignored)
```

Run from your project root:

```bash
pallas                     # start all agents + registry
pallas --agent jarvis      # start a single agent
```

Or via `python -m`:

```bash
python -m pallas.server
```

---

## `agents.yaml` format

```yaml
name: my-project           # used in log prefixes and registry names
version: "1.0.0"
host: my-host.example.com  # hostname for registry URLs
namespace: com.example.my-project
registry_port: 8200

agents:
  jarvis:
    module: agents.jarvis  # importable Python module path
    port: 8201
    title: Jarvis
    description: "My assistant agent"
    depends_on: [research]  # optional: start these first

  research:
    module: agents.research
    port: 8250
    title: Research Agent
    description: "Web search and knowledge graph"
```

---

## `fastagent.config.yaml` extensions

Pallas reads two extra keys beyond the standard fast-agent config:

```yaml
default_model: openai.my-custom-model-name

# Explicit capability declarations — avoids brittle name-regex heuristics
model_capabilities:
  vision: false
  context_window: 200000
  max_output_tokens: 32000
```

Capabilities are published in the registry and used to register unknown models
with fast-agent's `ModelDatabase`.

---

## Environment variable

| Variable | Default | Purpose |
|---|---|---|
| `PALLAS_AGENTS_CONFIG` | `agents.yaml` | Override path to deployment config |

---

## What Pallas provides

| Module | Purpose |
|---|---|
| `pallas.server` | CLI entry point and agent orchestration |
| `pallas.registry` | `GET /.well-known/mcp/server.json` registry server |
| `pallas.multimodal_server` | `MultimodalAgentMCPServer` — `AgentMCPServer` subclass with image support |
| `pallas.health` | LLM preflight validation + `get_health` MCP tool |