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Richard Feldman 756637fef5
Subagents PR 2: Thread spawning + execution (#46187) 
This PR implements the behind-the-scenes subagent execution logic:

### Core subagent execution
- Add `Thread::new_subagent()` constructor for creating subagent threads
- Implement `SubagentTool::run()` to spawn and manage subagent lifecycle
- Add `SubagentContext` for parent-child thread relationship
- Implement `submit_user_message()`, `interrupt_for_summary()`,
`request_final_summary()`
- Add timeout support and context-low detection (25% threshold)
- Propagate cancellation from parent to child threads

### Thread management
- Add `MAX_SUBAGENT_DEPTH` (4) and `MAX_PARALLEL_SUBAGENTS` (8) limits
- Add `register/unregister_running_subagent()` for tracking
- Add `restrict_tools()` for allowed_tools filtering
- Add `is_subagent()`, `depth()`, `is_turn_complete()` accessors

### Thread changes
- Add `ToolCallContent::SubagentThread` variant
- Add `ToolCallUpdateSubagentThread` for UI updates
- Add `tool_name` field for subagent detection
- Add `is_subagent()` method on `ToolCall`
- Add image support in `ContentBlock`

Release Notes:

- N/A

---------

Co-authored-by: Amp <amp@ampcode.com>
2026-01-12 18:07:41 +00:00
..
docs eval: Add HTML overview for evaluation runs (#29413) 2025-04-25 17:49:05 +03:00
src Subagents PR 2: Thread spawning + execution (#46187) 2026-01-12 18:07:41 +00:00
.gitignore Add judge to new eval + provide LSP diagnostics (#28713) 2025-04-14 20:18:47 +00:00
build.rs Use distinct user agents in agent eval and zeta-cli (#35897) 2025-08-08 23:26:38 +00:00
Cargo.toml eval: Port to agent2 (#40704) 2025-10-22 17:55:26 +00:00
LICENSE-GPL
README.md eval: Add support for reading from a .env file (#29426) 2025-04-25 15:53:02 +00:00
runner_settings.json eval: Port to agent2 (#40704) 2025-10-22 17:55:26 +00:00

README.md

Eval

This eval assumes the working directory is the root of the repository. Run it with:

cargo run -p eval

The eval will optionally read a .env file in crates/eval if you need it to set environment variables, such as API keys.

Explorer Tool

The explorer tool generates a self-contained HTML view from one or more thread JSON file. It provides a visual interface to explore the agent thread, including tool calls and results. See ./docs/explorer.md for more details.

Usage

cargo run -p eval --bin explorer -- --input <path-to-json-files> --output <output-html-path>

Example:

cargo run -p eval --bin explorer -- --input ./runs/2025-04-23_15-53-30/fastmcp_bugifx/*/last.messages.json --output /tmp/explorer.html