# `ConduitMcp.Client.Transport.InProcess`
[🔗](https://github.com/nyo16/conduit_mcp/blob/v0.11.0/lib/conduit_mcp/client/transport/in_process.ex#L1)

A `ConduitMcp.Client.Transport` that serves requests from a server module
in the same VM, for tests and development.

    {ConduitMcp.Client,
     name: :local,
     transport: {ConduitMcp.Client.Transport.InProcess, server: MyApp.MCPServer}}

Each request runs `ConduitMcp.Handler.dispatch/3` against the server
module, which classifies its era (`ConduitMcp.Era.classify/2`) exactly as
the HTTP transports do, in its own task under the client's
`Task.Supervisor`; the result comes back to the connection as a
transport event. The server module (`dsl: false`, DSL or
`ConduitMcp.Endpoint`) is the one you would mount behind
`ConduitMcp.Transport.StreamableHTTP`; no HTTP stack, socket or optional
dependency is involved.

There are no sessions and no HTTP headers, so plugs (authentication, rate
limiting, `ConduitMcp.Plugs.HeaderValidation`) do not run. Give the
server a caller identity with `:principal` instead.

Cancelling a request kills its task. The server never sends
server-to-client requests over this transport.

A modern `tools/call` sent with `:on_progress` (or after `set_log_level/2`)
runs to its response with the tool's `notifications/progress` and
`notifications/message` delivered as they happen, as over Streamable HTTP.
`subscriptions/listen` needs a stream this transport cannot hold and is
answered `-32601`.

## Options

  * `:server` (required) - the server module.
  * `:assigns` - `conn.assigns` for every request (default `%{}`).
  * `:principal` - a `ConduitMcp.Principal` map put on every request's
    conn with `ConduitMcp.Principal.put/2` (default: none).
  * `:remote_ip` - the conn's `remote_ip` (default `{127, 0, 0, 1}`).
  * `:server_name`, `:server_version`, `:instructions` - as for
    `ConduitMcp.Transport.StreamableHTTP` (an Endpoint's `:name` and
    `:version` are used when unset).

---

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