Add metadata_patch parameter for partial metadata updates#22
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Implement RFC 7396 JSON Merge Patch semantics for selective metadata updates. Adds new metadata_patch parameter to update_context tool that merges with existing metadata instead of replacing it. Supports adding, updating, and deleting keys (via null). Both SQLite (native json_patch) and PostgreSQL (custom jsonb_merge_patch function) backends are fully RFC 7396 compliant with deep merge for nested objects.
Add unit tests, integration tests, and real server tests for metadata_patch parameter. Tests cover basic operations, deep merge for nested objects, null-as-delete behavior, RFC 7396 limitations (array replacement), mutual exclusivity with metadata parameter, and edge cases.
Document the new metadata_patch parameter for update_context tool in README and metadata-filtering guide. Includes RFC 7396 JSON Merge Patch semantics, usage examples, known limitations (null-as-delete, array replacement), and comparison with full metadata replacement.
Update all 8 MCP tool descriptions in server.py following Anthropic's best practices for writing tools for agents. Add clear parameter documentation, usage guidance, constraints, and expected behaviors. Improves LLM ability to use tools correctly and efficiently.
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Implement RFC 7396 JSON Merge Patch semantics for selective metadata updates. Adds new metadata_patch parameter to
update_contexttool that merges with existing metadata instead of replacing it. Supports adding, updating, and deleting keys (via null). Both SQLite (nativejson_patch) and PostgreSQL (customjsonb_merge_patchfunction) backends are fully RFC 7396 compliant with deep merge for nested objects.