René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Spec corrections \u0026 deprecation markers","articleBody":"Tracks: #2794 #2805\n\nSmall corrections plus the deprecation markers required by the lifecycle policy.\n\n## What's in it\n\n- Server emits `-32602` (with `data.uri`) for unknown resources; client accepts both old and new (SEP-2164).\n- A shared \"deprecated per spec\" helper (SEP reference + earliest-removal date in the warning).\n- Apply markers to: HTTP+SSE transport, `includeContext` values, roots/sampling/logging surfaces, the legacy dynamic-client-registration fallback (per SEP-2596).\n\n## Conformance\n\n- `sep-2164-resource-not-found`\n\n## Dependencies\n\n- Depends on: none\n\n## References\n\n- [SEP-2164](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2164)\n- [SEP-2577](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2577)\n- [SEP-2596](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2596)\n- [Deprecated features](https://modelcontextprotocol.io/specification/draft/deprecated)\n","author":{"url":"https://github.com/maxisbey","@type":"Person","name":"maxisbey"},"datePublished":"2026-06-17T11:12:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/2904/python-sdk/issues/2904"}