fix: harden background questions, session prompts, and ACP execution - #170
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Gate AskUserQuestion background mode on the TaskList, TaskOutput, and TaskStop controls in both engines, re-evaluating the policy after the active tool set changes so a retained tool instance cannot keep advertising a mode it can no longer run. Stop rebuilding the system prompt when session instructions change mid-session, so an AGENTS.md edit no longer rewrites a bound agent's prompt. Let an ACP session fall back to local process execution when the client advertises no terminal or the spawn is not Bash-shaped, accept stdio MCP servers that declare no runtime identity, and prune a staged runtime entry when its removal teardown throws so the same runtime id can be registered again.
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Included review availability: Your plan provides up to 10 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe PR adds ACP local process fallback, local stdio MCP support, runtime cleanup fixes, stable bound system prompts, and conditional ChangesACP execution and MCP support
Session prompt and runtime cleanup
Conditional
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to The PR hardens session prompts, background-question behavior, and ACP execution paths, with the supplied checks and tests passing. No actionable merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant ACPClient
participant AcpProcessService
participant ACPConnection
participant IHostProcessService
ACPClient->>AcpProcessService: launch process request
alt terminal-enabled recognized shell
AcpProcessService->>ACPConnection: create ACP terminal
else other process
AcpProcessService->>IHostProcessService: spawn local process
end
sequenceDiagram
participant AskUserQuestionTool
participant IAgentToolPolicyService
participant TaskControls
AskUserQuestionTool->>IAgentToolPolicyService: evaluate active task controls
IAgentToolPolicyService->>TaskControls: check TaskList, TaskOutput, and TaskStop
IAgentToolPolicyService-->>AskUserQuestionTool: allow or deny background mode
AskUserQuestionTool->>AskUserQuestionTool: select schema and validate request
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@packages/acp-server/src/acp-terminal/acpTerminalRunner.ts`:
- Around line 58-59: Update the ACP terminal selection in acpTerminalRunner to
pass command into isBashToolInvocation, ensuring executable classification
occurs before choosing the ACP path. Preserve the local spawn fallback for
non-Bash commands, and add a regression test covering a non-Bash -c invocation
with bashEnv.
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.changeset/acp-local-execution-and-stdio-mcp.md.changeset/guard-background-questions.md.changeset/stable-session-system-prompt.mdpackages/acp-server/src/acp-terminal/acpTerminalRunner.tspackages/acp-server/src/convert.tspackages/acp-server/src/start.tspackages/acp-server/test/acp-terminal.test.tspackages/acp-server/test/convert.test.tspackages/acp-server/test/e2e-turn.test.tspackages/acp-server/test/lifecycle.test.tspackages/agent-core-v2/src/agent/profile/profileService.tspackages/agent-core-v2/src/agent/tools/ask-user-question/askUserQuestionTool.tspackages/agent-core-v2/src/runtime/runtimeUnitHost.tspackages/agent-core-v2/test/agent/profile/binding.test.tspackages/agent-core-v2/test/agent/questionTools/tools/ask-user.test.tspackages/agent-core-v2/test/runtime/runtimeUnitHost.test.tspackages/agent-core/src/agent/tool/index.tspackages/agent-core/src/tools/builtin/collaboration/ask-user.tspackages/agent-core/test/agent/tool.test.tspackages/agent-core/test/tools/ask-user.test.ts
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- packages/agent-core-v2/src/agent/profile/profileService.ts
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The terminal selector matched only the argument shape and the non-interactive env, so any other caller spawning `<binary> -c <script>` with the same env was routed to the client terminal, which can refuse to run that binary. Require the executable to be a shell as well.
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Related Issue
No issue — internal bug fixes found while auditing the agent engine and the ACP bridge.
Problem
Four defects, all reachable from normal use:
ProfileServicerebuilt it on everyAGENTS.mdchange, so editing instructions mid-session silently swapped the prompt the model had already been reasoning against, and invalidated the prompt cache.AskUserQuestionoffered background tasks that could not exist. The tool advertisedbackground: truein its schema and description regardless of whetherTaskList,TaskOutput, andTaskStopwere active. Choosing it produced a task nothing could list, read, or stop.AcpTerminalRunnerthrew when the client declared no terminal capability, so a whole class of ACP clients could not run a single shell command.What changed
instructions.onDidChangere-render.refreshSystemPromptstill reads instructions, so an explicitly requested refresh works — only the implicit rebuild is gone.AskUserQuestionnow derives its schema and its description from the live tool policy, in both engines. The v1 path passes the predicate, not a resolved boolean, so a policy change later in the session is picked up rather than frozen at construction.AcpTerminalRunnerfalls back to the local process service instead of throwing.IHostProcessServiceis threaded through the session runtime, the workspace attachment, the provider factory, andstart.ts.runtimeUnitHostprunes the staged entry in afinally, so a throwing teardown cannot strand it.Checklist
/approve).gen-changesetsskill, or this PR needs no changeset.gen-docsskill, or this PR needs no doc update.Verification
pnpm run typecheck0 ·pnpm run lint0 errors · agent-core 54/54 · agent-core-v2 and acp suites green.The
AskUserQuestionfix is mutation-proven: replacing the predicate with a resolved boolean turnsrechecks AskUserQuestion background mode after the task policy changesred (1 failed / 20 passed), and restoring it returns 21/21. That distinction is the entire point of the change, so it is the one guarded by a test that provably fails without it.Summary by CodeRabbit
New Features
Bug Fixes
AGENTS.mdchanges.