ubiquitous-invention/plans/Plan-agent-coordination/Epic-task-as-runnable-unit/Epic-task-as-runnable-unit.md
Randall Stillwell b2aff2045b feat(mcp): claim_task tool + register claim/complete pair
Pairs with the parallel complete_task commit. claim_task opens an
agent_runs row, flips status to in_progress only when it's safe
(ready/draft → in_progress, never overwriting a deliberate
blocked/done/in_progress), and returns the resolved workflow prompt
+ source level. Idempotent re-claim by the same actor returns the
existing run with reused=true and refreshes notes only — started_at
is sacred. Different-actor re-claim errors with ALREADY_CLAIMED
naming the existing actor and run id.

Tenancy fence: if the backlog item exists but in a different workspace
than the resolved handle, we refuse with "doesn't belong to workspace"
rather than 404. Prevents cross-tenant existence fishing.

All three writes (run insert + status flip + audit insert) happen in
one db.transaction() so a partial claim is unreachable.

tools/index.ts now registers both claim_task and complete_task.

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-06-02 22:23:05 -05:00

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2 KiB
Markdown

---
kind: epic
slug: task-as-runnable-unit
title: Task as runnable unit — workflow prompts and a runs table
plan_slug: agent-coordination
status: ready
priority: P2
tenant_id: global
cursor_epic_id: null
updated_at: "2026-06-01"
---
# Epic objective
Every backlog item can carry a workflow prompt; every agent session against a task gets recorded in a `runs` table. These two changes are the foundation that `claim_task` / `complete_task` build on.
## In scope / out of scope
**In scope**
- Schema additions for workflow prompts.
- New `runs` table + tRPC router.
- Minimal UI for editing the prompt and viewing recent runs.
**Out of scope**
- The actual MCP tools (next epic).
- Orchestrator process (deferred epic).
## Related tasks
| Task | Link |
|------|------|
| Add workflow prompt to backlog items | `./Task-add-workflow-prompt-to-backlog-items.md` |
| Runs table and tRPC router | `./Task-runs-table-and-trpc-router.md` |
## Dependencies
- Depends on: `Plan-daily-driver-finish` (don't extend stubs).
- Blocks: `Epic-mcp-claim-complete`.
## Acceptance criteria
- [x] A task row can store an optional workflow prompt that overrides the epic/plan default. (Schema column `workflow_prompt`, parser plumbing, slug-based inheritance walk all shipped.)
- [x] An `agent_runs` row captures `started_at`, `finished_at`, `actor_user_id`, `outcome`, `tokens_input`, `tokens_output`, `tokens_total`, `notes`, `error`, and `metadata`. (One column more than the spec — added `tokens_total` because Symphony's "absolute totals win" rule needs explicit storage.)
- [x] Minimal UI lets an operator read recent runs at `/[workspaceSlug]/settings/runs`. Prompt-editing UI is deferred to `Task-workflow-prompt-task-detail-ui.md` because `apps/web` doesn't yet have a backlog-item detail panel.
## Proposed timeline
| Phase | Window | Notes |
|-------|--------|-------|
| Schema + procedures | Day 1 | Columns, table, tRPC router. |
| UI surfacing | Day 2 | Inline prompt editor, recent-runs panel. |