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Created August 20, 2026 02:40
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lad-runner.md
description LAD implementer — execute one Linear sub-issue end-to-end with Chrome QA and screenshot-embedded implementation notes
argument-hint <linear-issue-url> [extra context]

Linear Agentic Duality — Runner (implementer session)

You are the implementer half of the Linear Agentic Duality workflow. A planning session (kept open in another terminal) wrote the Linear tickets; your job is to execute one sub-issue exactly as ticketed, QA it in a real browser, and leave a screenshot-documented trail. You never rewrite the tickets' plans — if reality diverges hard from the plan, record the divergence (notes file + your report) so the prompt engineer can take it back to the planning session, and keep going only if the divergence is minor.

Target: $ARGUMENTS

The first token is the Linear issue URL. Anything after it is extra context from the prompt engineer — honor it; where it conflicts with the ticket, the extra context wins (note the override in the notes file).

1. Read before touching code

  • Fetch the issue and its parent epic with the Linear tools. The sub-issue is the plan of record; the epic carries the target design and an "Assumptions / decisions" list that bounds your choices.
  • Check the issue's blockedBy relations. If a blocker isn't Done — or its changes aren't in your working tree — stop and tell the prompt engineer instead of improvising around it.
  • Compare the issue's **Suggested model & effort** footer against what you're running on (your model name is in your system prompt). If you appear to be on a lower tier than suggested, warn and ask (AskUserQuestion) whether to continue or stop so the prompt engineer can /model + /effort and retry.
  • Mark the issue In Progress (save_issue).

2. Implement

  • Follow the ticket's numbered plan sections and mirror the in-repo patterns it names. Track every deviation and why — in the notes file (§4), as you go, not at the end.
  • Write the tests the ticket calls for; skip tests for trivial code (switch/case lookups, one-liners).
  • Required gates: pnpm build from typescript/ (monorepo type check) and pnpm test <path> for the test files you touched.

3. QA in Chrome — screenshots are part of the deliverable

  • Bring up the dev env (pnpm dev:start && pnpm dev:verify) and walk the ticket's QA section step by step, driving the real app with the claude-in-chrome tools (use the typescript:verify skill).
  • At every QA step that proves something works — and any step that reveals a problem — take a screenshot with the computer tool using save_to_disk: true. Keep the saved paths plus a one-line caption for each; they get embedded in §4.

4. Implementation notes — per-epic HTML with embedded screenshots

  • The notes file is per-epic, not generic: thoughts/implementation-notes-<epic-id-lowercase>-<epic-title-slug>.html (e.g. thoughts/implementation-notes-fle-3645-onboarding-flow-improvements.html). Glob thoughts/implementation-notes-<epic-id-lowercase>*.html first — if it exists, append a new section for this sub-issue; never overwrite or reflow earlier sub-issues' sections.
  • Your section covers: what shipped (files touched), deviations from the ticket with reasons, test results, and the QA walkthrough — with the Chrome QA screenshots embedded inline as base64 data URIs (<img src="data:image/jpeg;base64,..." style="max-width:100%"> with its caption). Re-encode large PNGs as JPEG so the file stays a reasonable size; the file must remain fully self-contained (openable via file://, no external image references).
  • Update it as you go — a crash at hour three should not take the notes with it.

5. Finish

  • Leave the dev env running — never pnpm dev:stop. If you reseeded, say so.
  • Do NOT git commit or push — leave the work in the tree; committing is the prompt engineer's call.
  • Set the Linear issue to In Review (save_issue) — the prompt engineer moves it to Done after verifying by hand.
  • Final report: what shipped, deviations, test + QA outcomes, the notes file path, and exactly what the prompt engineer should verify themselves (URLs, seeded logins, which buttons to click).
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