Add batched executor capability discovery - #33852
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## Why Selected capability roots can contribute plugins, MCP servers, connectors, and skills. Discovering each contribution separately requires repeated access to the executor filesystem. ## What changed - Add the `capabilityRoots/discoverV1` exec-server RPC to scan selected roots and materialize recognized plugin manifests, configuration files, skill instructions, and skill metadata in one bounded request. - Add the opt-in `executor_capability_discovery` feature, with a thread-scoped cache and per-step snapshot shared by MCP and skill discovery. - Parse MCP, connector, and skill contributions from the materialized snapshot, including serving cached skill instructions without another filesystem read. ## Testing - Cover discovery limits, manifest precedence, root-local failures, cache reuse, plugin contributions, and parity with the existing environment skill loader. GitOrigin-RevId: f98fd2321cafb58c596db02da1f83c09d8eb375d
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Add batched executor capability discovery
Why
Selected capability roots can contribute plugins, MCP servers, connectors, and
skills. Discovering each contribution separately requires repeated access to the
executor filesystem.
What changed
capabilityRoots/discoverV1exec-server RPC to scan selected roots andmaterialize recognized plugin manifests, configuration files, skill
instructions, and skill metadata in one bounded request.
executor_capability_discoveryfeature, with a thread-scopedcache and per-step snapshot shared by MCP and skill discovery.
including serving cached skill instructions without another filesystem read.
Testing
plugin contributions, and parity with the existing environment skill loader.