# `Anubis.Protocol.Behaviour`

Behaviour that each MCP protocol version module must implement.

Each protocol version (e.g., 2024-11-05, 2025-03-26, 2025-06-18) implements
this behaviour to isolate version-specific logic. This makes it trivial to add
support for new MCP spec versions without scattering conditionals across the codebase.

## Version differences

- **2024-11-05**: Initial spec, SSE transport, basic tools/resources/prompts
- **2025-03-26**: Added Streamable HTTP, JSON-RPC batching, authorization framework, tool annotations
- **2025-06-18**: Removed batching, added structured tool output, elicitation, resource_link type

# `feature`

```elixir
@type feature() :: atom()
```

# `message`

```elixir
@type message() :: map()
```

# `method`

```elixir
@type method() :: String.t()
```

# `params`

```elixir
@type params() :: map()
```

# `version`

```elixir
@type version() :: String.t()
```

# `notification_methods`

```elixir
@callback notification_methods() :: [method()]
```

All notification methods supported by this version.

# `notification_params_schema`

```elixir
@callback notification_params_schema(method()) :: term()
```

Peri schema for validating notification params by method for this version.

# `progress_params_schema`

```elixir
@callback progress_params_schema() :: map()
```

Progress notification params schema for this version.

# `request_methods`

```elixir
@callback request_methods() :: [method()]
```

All request methods supported by this version.

# `request_params_schema`

```elixir
@callback request_params_schema(method()) :: term()
```

Peri schema for validating request params by method for this version.

# `supported_features`

```elixir
@callback supported_features() :: [feature()]
```

List of features/capabilities this protocol version supports.

# `version`

```elixir
@callback version() :: version()
```

Returns the version string this module implements (e.g., '2025-03-26').

---

*Consult [api-reference.md](api-reference.md) for complete listing*