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Model Context Protocol server for OSC (Open Sound Control) endpoint management
The server defines 4 OSC tools with explicit schemas and descriptions. All tools have names that follow verb_noun convention (create_, stop_, get_). Descriptions are present and moderately detailed (50-120 characters), explaining purpose and context. Input schemas include proper JSON Schema with types, descriptions, and min/max constraints. However, critical gaps emerge: (1) Output schemas are not documented, responses are inferred but never formally specified; (2) Error handling lacks recovery guidance and doesn't classify errors (retryable vs fatal); (3) Parameter descriptions are terse, missing context like 'why use filters' or 'when to set bufferSize'; (4) No tool annotations (readOnlyHint, destructiveHint, idempotentHint) despite clear risk profiles (create_osc_endpoint is WRITE, stop_osc_endpoint is IRREVERSIBLE); (5) Response chaining, get_osc_messages returns only messages, not the endpointId needed to chain with get_endpoint_status without extra state tracking. Definition quality is solid but below 'A' grade due to missing output schemas and error guidance.
Create a new OSC endpoint to listen for incoming OSC messages
Get status information for OSC endpoints
Query received OSC messages from endpoints
Stop and remove an existing OSC endpoint
No output schemas documented for any tool. LLMs cannot plan downstream calls or extract the right data from responses. For example, get_osc_messages returns 'MessageQueryResponse' but the structure is not visible in tool definition, agents must guess whether response contains {messages: [{address, values, timestamp}]} or {data: ..., meta: ...}.
Missing tool annotations despite clear risk profiles. create_osc_endpoint should have destructiveHint=true or similar (WRITE operation). stop_osc_endpoint should have destructiveHint=true or irreversibleHint (IRREVERSIBLE risk). get_osc_messages and get_endpoint_status should have readOnlyHint=true. Without annotations, agents cannot optimize (e.g., deferring writes until confirmation) or apply permission checks.
Inferred effective spec: <=2025-11-25.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-22 | C | 68 | <=2025-11-25 | v2 |
| 2026-03-09 | C | 62 | - | v1 |
Error handling missing. No recovery guidance. For example, if create_osc_endpoint fails with 'Port already in use', the response should suggest 'Try a different port or call get_endpoint_status to see available ports.' Currently, error classification (retryable vs fatal) is absent.
Parameter descriptions are terse and lack actionable context. addressFilters in create_osc_endpoint is described as 'OSC address patterns to filter messages (optional)' but gives no examples or format guidance. Description should include: 'OSC address patterns to filter messages, e.g. /mixer/fader, /synth/*, or /drum/kick (optional; omit to accept all).'
Response chaining broken. If get_osc_messages returns a list of messages, the response should include the endpointId from which they came. Without it, agents cannot chain to subsequent operations (e.g., 'Get status of the endpoint that sent these messages') without passing endpointId as implicit context.
Confirmation/dry-run pattern absent for irreversible stop_osc_endpoint. Agents can accidentally stop listening endpoints. Tool should support a 'confirm_stop=true' parameter or include explicit warning in response: 'Endpoint stopped. All buffered messages are discarded.'