- Introduced `Max` as a first-class reasoning effort tier across all packages, including AI providers, coding agent configurations, and RPC protocols.
- Refactored model effort ladders to use wire-exact mappings and removed legacy effort aliasing (e.g., `max-to-xhigh` mapping).
- Updated model registry and provider configurations to support `Max` tier routing, color themes, and UI icon associations.
- Expanded test suites to provide end-to-end coverage for the new reasoning tier, including updated compatibility and fallback scenarios.
The RPC transport did not treat cancellation as an independent, resettable
control plane, so two lifecycle contract violations shared a root cause:
A. Server-side: the stdin loop in `rpc-mode.ts` awaited each commands
`handleCommand` before pulling the next frame, so `abort_bash` queued
behind the `bash` it must cancel. Extracted `dispatchRpcInputFrame` and
dispatch `bash` in the background: the input loop keeps reading, so
`abort_bash` (or any other command) can preempt an in-flight shell.
Response correlation still rides `command.id`; ordering across
concurrent commands is documented as not guaranteed.
B. Client-side: `RpcClient.stop()` aborted the shared `#abortController`
but never replaced it, so a subsequent `start()` handed a pre-aborted
signal to `readJsonl` and the stdout reader exited immediately with a
spurious "Agent process exited before ready" while the spawned child
leaked in `#process`. Mint a fresh `AbortController` inside `start()`
and clean up the child on any post-spawn failure.
Adds:
- `dispatchRpcInputFrame` unit tests covering the concurrent bash + abort
ordering, serial dispatch of other commands, and background error
reporting.
- `RpcClient` lifecycle tests covering start->stop->start on the same
instance (via a mock fixture agent) and retry after a failed start.
- Documents the bash concurrency contract in `docs/rpc.md`.
Fixes#4079
- Added host tool execution framework with HostTool, HostToolContext, and host_tool() factory for custom tool integration.
- Added RpcConcurrencyError exception and _PromptLifecycleCoordinator to enforce single-flight constraint on prompt lifecycle methods.
- Enhanced JSON parsing with 10 validation helpers and enum frozensets for safe field extraction with detailed error messages.
- Replaced manual event/error list management with _BoundedHistory for bounded-size history with offset tracking.
- Added deep JSON cloning to prevent external mutations of stored payloads and improved UTF-8 error handling in subprocess stderr.
- Added custom_tools parameter to RpcClient and set_custom_tools() method for runtime tool registration.
- Added typed event listeners and granular event handling for all RPC notification types.
- Added set_todos RPC command and todoPhases session state field for todo phase management.
- Added RpcClient initialization parameters (thinking, tools, no_session, rpc_defaults) for startup configuration.
- Added install_headless_ui() method and todo management methods (get_todos, set_todos, clear_todos).
- Added TodoItem and TodoPhase dataclasses with parser functions for structured todo representation.
- Added RPC mode behavior: disables session title generation by default and resets workflow settings to built-in defaults.
- Moved documentation files from packages/coding-agent/docs/ to root docs/ directory to flatten the documentation structure.
- Updated all internal documentation links to account for the new file locations, adjusting relative paths to maintain correct references across the monorepo.
- Updated README.md and issue template configuration to reference documentation at the new root docs/ location instead of packages/coding-agent/docs/.
can1357