Tool search configuration support

[almaleksia]

Adding tool_search option to CreateSession/ResumeSession and tool_references as optional field in ToolResult.

[Copilot]

Pull request overview

This PR adds cross-SDK support for configuring the runtime’s tool-search behavior on session create/resume, and extends tool results to optionally carry tool-search references returned by a tool-search tool.

Changes:

• Add tool_search/toolSearch session option to CreateSession/ResumeSession across Rust, Python, Node, Go, Java, and .NET SDKs.
• Add optional tool-search reference metadata to tool results (tool_references/toolReferences) across SDKs.
• Update tests and request builders/serialization layers to carry the new fields through to the CLI/runtime wire format.

Show a summary per file

File	Description
rust/tests/e2e/tool_results.rs	Updates E2E test helper to include tool_references in expanded tool results.
rust/src/wire.rs	Adds tool_search to create/resume wire payload structs (camelCase on the wire).
rust/src/types.rs	Introduces ToolSearchConfig; threads tool_search through SessionConfig/ResumeSessionConfig; adds tool_references to ToolResultExpanded.
rust/src/tool.rs	Ensures MCP tool-result conversion initializes tool_references.
rust/src/session.rs	Ensures tool failure results initialize tool_references.
python/copilot/tools.py	Adds tool_references to ToolResult (needs adjustment to avoid a useless string expression).
python/copilot/session.py	Adds ToolSearchConfig TypedDict; forwards tool_references when responding with tool results.
python/copilot/client.py	Adds tool_search parameter to create/resume and serializes it to toolSearch wire format.
python/copilot/init.py	Exposes ToolSearchConfig from the package API surface.
nodejs/src/types.ts	Adds ToolReferences to tool result type; introduces ToolSearchConfig and toolSearch in session config typing.
nodejs/src/index.ts	Re-exports ToolSearchConfig.
nodejs/src/client.ts	Forwards toolSearch in create/resume session JSON-RPC payloads.
java/src/test/java/com/github/copilot/ToolResultsTest.java	Updates tests for the expanded ToolResultObject record signature.
java/src/main/java/com/github/copilot/SessionRequestBuilder.java	Forwards toolSearch from config into create/resume requests.
java/src/main/java/com/github/copilot/rpc/ToolSearchConfig.java	Adds new RPC model for tool-search configuration.
java/src/main/java/com/github/copilot/rpc/ToolResultObject.java	Adds toolReferences field to the record and updates factory methods/docs.
java/src/main/java/com/github/copilot/rpc/SessionConfig.java	Adds toolSearch to the Java session config object + clone support.
java/src/main/java/com/github/copilot/rpc/ResumeSessionRequest.java	Adds toolSearch to resume request RPC shape.
java/src/main/java/com/github/copilot/rpc/ResumeSessionConfig.java	Adds toolSearch to resume config + clone support.
java/src/main/java/com/github/copilot/rpc/CreateSessionRequest.java	Adds toolSearch to create request RPC shape.
go/types.go	Adds ToolSearchConfig, threads it through session configs and wire request structs; adds ToolReferences to tool result.
go/session.go	Forwards ToolReferences when sending tool results back to the runtime.
go/client.go	Forwards ToolSearch into create/resume requests.
dotnet/src/Types.cs	Adds ToolReferences to tool result type; introduces ToolSearchConfig and threads it into session config base (doc typo present).
dotnet/src/Client.cs	Threads ToolSearch into create/resume request records.

Review details

• Files reviewed: 25/25 changed files
• Comments generated: 2
• Review effort level: Low