scema-mcp

The loop as Model Context Protocol tools.

Part of Scematica Omni — an agent runtime that perceives an environment, projects competing futures, ranks them under a stated preference, decides or refuses to, and seals a verifiable record of what it did.

The organising idea across every crate: each layer can say "I don't know", and saying it costs nothing. An agent that cannot express ignorance expresses a number of the right shape instead, and nothing downstream can tell it from a measurement.

{ "mcpServers": { "scema-omni": { "command": "scema-mcp", "args": ["--allow", "/proj"] } } }

omni_observe, omni_simulate, omni_explain, omni_verify, omni_policy, omni_memory, and omni_decide when enabled. Newline-delimited JSON-RPC on stdio, so stdout is the transport and every diagnostic goes to stderr.

Links the loop directly rather than proxying a daemon: same library, one less hop, and no way for two surfaces to disagree about what the loop does.

Two guards specific to a model caller. Paths resolve through Workspace — not paranoia about a hostile model, but because a cooperative one asked to audit a project will reason its way to ~/.ssh, that being genuinely relevant to an audit. And omni_decide is not advertised at all without --allow-decide, because a tool that is listed and always fails teaches a model to retry it.

A refused path comes back as a tool result with isError, never a JSON-RPC error: clients surface the latter as "the server broke", and a model told that stops trying, where one told "that path is outside the workspace, which is X" corrects itself.

Licensed MIT.