kandev/docs/plans/cursor-subagent-metadata/task-02-parse-correlate-cursor-task.md

id, title, status, wave, depends_on, plan, spec

id	title	status	wave	depends_on	plan	spec
02-parse-correlate-cursor-task	Parse and correlate cursor/task onto the subagent payload	done	2	01-sdk-extension-seam	plan.md	../../specs/agents/cursor-subagent-metadata.md

Task 02: Parse and correlate cursor/task onto the subagent payload

Parse cursor/task, correlate it to the standard subagent tool_call by toolCallId, and merge its metadata (description, prompt, model, agentId) onto the existing SubagentTaskPayload. Also map the completion rawOutput.isBackground onto IsAsync.

Acceptance

• A subagent tool_call plus a matching cursor/task (in either arrival order) produces one SubagentTaskPayload carrying Cursor's description, prompt, model, and agent id.
• An object-shaped subagentType is ignored (never coerced to the string SubagentType); missing fields leave their targets zero-valued.
• An already-set field is not blanked by a later empty Cursor value.
• A cursor/task with no matching tool_call is dropped at session teardown.
• Completion rawOutput.isBackground:true sets IsAsync; false/absent does not.

Verification

cd apps/backend && go test ./internal/agentctl/server/adapter/transport/acp/...

Files likely touched

• apps/backend/internal/agentctl/server/adapter/transport/acp/dialect_cursor.go (new) — parse params, applyCursorTaskMeta.
• apps/backend/internal/agentctl/server/adapter/transport/acp/adapter_cursor.go (new) — store pending Cursor metadata, merge it in either arrival order, and clear it on teardown.
• apps/backend/internal/agentctl/server/adapter/transport/acp/adapter.go — set the WithCursorTaskHandler callback; per-session map[toolCallId]cursorTaskMeta; clear on teardown.
• apps/backend/internal/agentctl/server/adapter/transport/acp/adapter_tools.go — merge pending metadata onto the first matching tool_call payload.
• apps/backend/internal/agentctl/server/adapter/transport/acp/adapter_session.go — clear unmatched pending metadata on session reset/teardown.
• apps/backend/internal/agentctl/server/adapter/transport/acp/subagent.go — extend cursorSubagentResult to read isBackground → IsAsync.
• apps/backend/internal/agentctl/server/adapter/transport/acp/dialect_cursor_test.go (new)
• apps/backend/internal/agentctl/server/adapter/transport/acp/subagent_test.go — isBackground + correlation cases.

Dependencies

Task 01 (needs the CursorTaskHandler seam).

Parallelism

sequential.

Inputs

• Spec: "API surface" (exact param shape), "Failure modes", "Scenarios".
• Plan: "Area 2", "Area 3".
• Code refs: subagent.go:224,349,371 (extractSubagentResult, cursorSubagentResult, applySubagentResult); tool_payload.go SubagentTaskPayload; adapter.go:449 connection wiring.
• Wire fixture: acp-debug/cursor-acp-linger-20260820-145213.jsonl.

Output contract

Summary, files changed, tests run + counts, blockers, risks; update this task's status and plan.md Wave 2 checkbox and Verification Results.

Results

• Added defensive Cursor param parsing for toolCallId, agentId, description, model, and prompt, ignoring object-shaped subagentType.
• Added per-session correlation state so cursor/task and the subagent tool_call merge into one SubagentTaskPayload in either arrival order, and unmatched pending state is dropped on teardown.
• Extended Cursor result enrichment so rawOutput.isBackground:true sets IsAsync, which reuses the existing background-chip UI.
• cd apps/backend && go test ./internal/agentctl/server/adapter/transport/acp/... passed.