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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kind	slug	title	plan_slug	status	priority	tenant_id	cursor_epic_id	updated_at
epic	task-as-runnable-unit	Task as runnable unit — workflow prompts and a runs table	agent-coordination	ready	P2	global	null	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).

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

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.)
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.)
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.

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