feature-implementation

name

feature-implementation

description

Guides the full lifecycle of a feature-implementation tagged MCP item (the feature container) — from queue through review. Creates or resumes the feature container, fills gate-enforced notes at each phase (feature-summary, implementation-notes, session-tracking, review-checklist), dispatches implementation subagents, and advances through queue, work, and review to terminal. Use when the user says: implement a feature, start a new feature, feature workflow, resume feature work, guide feature lifecycle, or references a feature-implementation item UUID.

Feature Implementation Workflow

End-to-end workflow for a feature-implementation tagged item — the feature container that holds the plan and holistic review. Child work items under this container use the feature-task tag with lighter gates (task-scope instead of the feature-level feature-summary, and no review phase by default — task-level review is opt-in via the needs-task-review trait, which adds a review-checklist note to that child). A second child-level trait, needs-test-author, is opt-in the same way (applied per the /implement Step 1 trigger rule) and adds its own gate-enforced notes.

Covers all three phases (queue → work → review) with gate-enforced notes at each transition.

Usage: /feature-implementation [item-uuid]

• If item-uuid is provided: load the existing item and resume from its current phase
• If omitted: create a new item and start from the beginning

---

Phase 0 — Setup

If an item UUID was provided, call:

get_context(itemId="<uuid>")

Check canAdvance and missingRequiredNotes to determine which phase the item is in, then jump to the appropriate phase below.

If no UUID was provided, create the item:

manage_items(
  operation="create",
  items=[{ title: "<feature title>", tags: "feature-implementation", priority: "medium" }]
)

Note the returned UUID and expectedNotes list. Confirm the item is in queue role, then continue to Phase 1.

---

Phase 1 — Queue: Define the Feature Summary

Goal: Fill the single required queue-phase note before advancing to work.

1a. Fill feature-summary

Use manage_notes to upsert the feature-summary note:

manage_notes(
  operation="upsert",
  notes=[{
    itemId: "<uuid>",
    key: "feature-summary",
    role: "queue",
    body: "<content>"
  }]
)

What to write: Keep this note lean (target under 2k chars) — it stays at the feature level, not the child-task level where the full spec-quality disciplines apply. Cover:

• Goal — the problem this solves and who benefits.
• Findings → tasks table — a table mapping each finding or requirement to the child task that will address it.
• Dependency edges — ordering constraints between child tasks, if any.
• Non-goals pointer — a reference to where non-goals are documented per child (each child's task-scope note carries its own alternatives/non-goals/blast-radius/risk/test strategy per the spec-quality framework); this note does not repeat that analysis.

1b. Enter plan mode

After filling the note, use EnterPlanMode to explore the codebase and produce a concrete implementation plan. The pre-plan hook will inject additional guidance.

When the plan is approved, post-plan hook fires — proceed directly to Phase 2 without pausing.

1c. Advance to work

advance_item(transitions=[{ itemId: "<uuid>", trigger: "start" }])

Gate check: feature-summary must be filled. If gate rejects, fill the missing note and retry. If instead the response has errorCode: "resource_unavailable" (errorKind: "transient"), this is resource-lease contention, not a note gate failure — see Quick Reference below.

Confirm newRole: "work" in the response before dispatching implementation subagents.

---

Phase 2 — Work: Implement and Document

Goal: Delegate implementation, then fill work-phase notes before advancing to review.

2a. Materialize any child items

If the feature has sub-tasks, create them now using create_work_tree with the feature UUID as parentId and the feature-task tag. Each child fills a task-scope queue note (the full spec-quality disciplines — alternatives, non-goals, blast radius, risk flags, test strategy — apply there, not in the feature-level feature-summary). Dispatch implementation subagents with each child item UUID.

Each subagent must:

• Call advance_item(trigger="start") on their item to enter work phase
• Fill work-phase notes following the JIT progression loop (the subagent-start hook provides guidance via guidancePointer and skillPointer)
• Return to the orchestrator — do NOT call advance_item again. The orchestrator handles all further transitions.

By default, feature-task items have no review phase — advance_item(trigger="start") from work goes straight to terminal. A child only gets a review phase if it (or its schema's default_traits) carries the needs-task-review trait, which adds the review-checklist note back in, or the needs-test-author trait, which adds test-independence-audit.

2b. Fill implementation-notes

After implementation agents return:

manage_notes(
  operation="upsert",
  notes=[{
    itemId: "<uuid>",
    key: "implementation-notes",
    role: "work",
    body: "<content>"
  }]
)

What to write: Key decisions made during implementation. Deviations from the plan. Any surprises (wrong class names, API differences, test isolation issues). Files changed with line counts. If an observation was fixed, reference its item ID.

2c. Fill session-tracking

manage_notes(
  operation="upsert",
  notes=[{
    itemId: "<uuid>",
    key: "session-tracking",
    role: "work",
    body: "<content>"
  }]
)

What to write: Run ./gradlew :current:test. Report total count and any failures, new test classes or cases added, and a summary of what changed this session. This note comes from the session-tracked default trait and feeds /session-retrospective.

2d. Advance to review

advance_item(transitions=[{ itemId: "<uuid>", trigger: "start" }])

Gate check: both implementation-notes and session-tracking must be filled. Confirm newRole: "review" in the response.

---

Phase 3 — Review: Verify, Deploy, and Close

Goal: Fill the required review-checklist note (per the review-quality skill), deploy and verify in the running MCP server, then close the item.

3a. Fill review-checklist

Follow the review-quality skill's framework — plan alignment against feature-summary and each child's task-scope, test quality, and (if /simplify ran) test coverage of its changes.

manage_notes(
  operation="upsert",
  notes=[{
    itemId: "<uuid>",
    key: "review-checklist",
    role: "review",
    body: "<content>"
  }]
)

What to write: A feature-level verdict aggregating across children — reference each child's own review-checklist if the needs-task-review trait produced one. See the review-quality skill for the full findings format and verdict types (Pass / Fail — blocking issues / Pass with observations).

3b. Deploy to Docker (if needed)

Run /deploy_to_docker --current to rebuild the image with the new code. Reconnect MCP after deploy: /mcp.

3c. Smoke test the change

Exercise the new capability via MCP tool calls. Confirm it behaves as described in the feature-summary note's goal.

3d. Fill deploy-notes (optional)

manage_notes(
  operation="upsert",
  notes=[{
    itemId: "<uuid>",
    key: "deploy-notes",
    role: "review",
    body: "<content>"
  }]
)

What to write: Whether a Docker rebuild was done and what image tag was used. Plugin version bump (if any). MCP reconnect required. Any smoke test results.

3e. Close the item

advance_item(transitions=[{ itemId: "<uuid>", trigger: "start", summary: "<one-line summary>" }])

Confirm newRole: "terminal". Run get_context() health check to verify no stalled items.

---

Quick Reference

Phase	Required notes	Advance trigger
queue	feature-summary	start → work
work	implementation-notes, session-tracking	start → review
review	review-checklist	start → terminal

Gate error pattern: "required notes not filled for <phase> phase: <keys>" → Fill the listed notes, then retry advance_item.

Resource-lease contention pattern: applied: false, errorCode: "resource_unavailable", errorKind: "transient", contendedResources: [...] on a start into work — a different failure mode than the gate error above. Do NOT fill notes or spin-retry; the resource is held by another item. Work a different item and retry later, or report contention upstream.