Vendor exact Matt productivity and engineering skills snapshot

custom-skills/matt/LICENSE

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+MIT License
+
+Copyright (c) 2026 Matt Pocock
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

custom-skills/matt/PROVENANCE.md

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+# Matt skills snapshot provenance
+
+This directory vendors an exact snapshot of Matt Pocock's public skills repository.
+
+- Source: https://github.com/mattpocock/skills
+- Commit: `84fdeffd12f2ee307994d1eb6feb48173b6e0502`
+- Source roots: `skills/productivity/` and `skills/engineering/`
+- Destination roots: `custom-skills/matt/productivity/` and `custom-skills/matt/engineering/`
+- Snapshot inventory: 76 files from the two source roots, plus the upstream `LICENSE`.
+- License: the upstream MIT license is retained verbatim at `custom-skills/matt/LICENSE`.
+- Hash evidence: `SNAPSHOT.sha256` records the source path, destination path, byte count, source SHA-256, and destination SHA-256 for every copied file.
+
+Reproduce the snapshot from the pinned commit with:
+
+```sh
+git archive 84fdeffd12f2ee307994d1eb6feb48173b6e0502 skills/productivity skills/engineering LICENSE | tar -x
+```
+
+Copy `skills/productivity/` to `custom-skills/matt/productivity/`, copy `skills/engineering/` to `custom-skills/matt/engineering/`, and copy `LICENSE` to `custom-skills/matt/LICENSE`.
+
+Verify every source and destination pair with `cmp` and the matching rows in `SNAPSHOT.sha256`.
+
+The copied upstream files are byte-preserved and are not adapted for Firstmate.

custom-skills/matt/engineering/README.md

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+# Engineering
+
+Skills I use daily for code work.
+
+## User-invoked
+
+Reachable only when you type them (Claude Code: `disable-model-invocation: true`; Codex: `policy.allow_implicit_invocation: false` in `agents/openai.yaml`).
+
+- **[ask-matt](./ask-matt/SKILL.md)** — Ask which skill or flow fits your situation. A router over the user-invoked skills in this repo.
+- **[grill-with-docs](./grill-with-docs/SKILL.md)** — Grilling session that also builds your project's domain model, sharpening terminology and updating `CONTEXT.md` and ADRs inline.
+- **[triage](./triage/SKILL.md)** — Move issues through a state machine of triage roles.
+- **[improve-codebase-architecture](./improve-codebase-architecture/SKILL.md)** — Scan a codebase for deepening opportunities, present them as a visual HTML report, then grill through whichever one you pick.
+- **[setup-matt-pocock-skills](./setup-matt-pocock-skills/SKILL.md)** — Configure this repo for the engineering skills (issue tracker, triage labels, domain doc layout). Run once per repo.
+- **[to-spec](./to-spec/SKILL.md)** — Turn the current conversation into a spec and publish it to the issue tracker.
+- **[to-tickets](./to-tickets/SKILL.md)** — Break any plan, spec, or conversation into a set of tracer-bullet tickets, each declaring its blocking edges — text in a local file, or native blocking links on a real tracker.
+- **[implement](./implement/SKILL.md)** — Build the work described by a spec or set of tickets, driving `/tdd` at pre-agreed seams and closing out with `/code-review` before committing.
+- **[wayfinder](./wayfinder/SKILL.md)** — Plan a huge chunk of work — more than one agent session can hold — as a shared map of decision tickets on the issue tracker, resolved one at a time until the way to the destination is clear.
+
+## Model-invoked
+
+Model- or user-reachable (rich trigger phrasing so the model can reach for them).
+
+- **[prototype](./prototype/SKILL.md)** — Build a throwaway prototype to answer a design question: a single shareable HTML file for state/logic, or several toggleable UI variations.
+
+- **[diagnosing-bugs](./diagnosing-bugs/SKILL.md)** — Disciplined diagnosis loop for hard bugs and performance regressions: build a feedback loop that goes red on this bug → minimise → hypothesise → instrument → fix → regression-test.
+- **[research](./research/SKILL.md)** — Investigate a question against high-trust primary sources and capture the findings as a cited Markdown file in the repo, run as a background agent.
+- **[tdd](./tdd/SKILL.md)** — Test-driven development with a red-green-refactor loop. Builds features or fixes bugs one vertical slice at a time.
+- **[domain-modeling](./domain-modeling/SKILL.md)** — Actively build and sharpen a project's domain model — challenge terms, stress-test with scenarios, update `CONTEXT.md` and ADRs inline.
+- **[codebase-design](./codebase-design/SKILL.md)** — Shared discipline and vocabulary for designing deep modules: small interfaces, clean seams, testable through the interface.
+- **[code-review](./code-review/SKILL.md)** — Two-axis review of the diff since a fixed point: **Standards** (does it follow the repo's coding standards, plus a Fowler smell baseline?) and **Spec** (does it faithfully implement the originating issue/spec?), run as parallel sub-agents.
+- **[resolving-merge-conflicts](./resolving-merge-conflicts/SKILL.md)** — Work through an in-progress git merge or rebase conflict hunk by hunk, resolving by intent traced to each side's primary source, then finish the operation — never `--abort`.
+- **[wizard](./wizard/SKILL.md)** — Generate an interactive bash wizard that walks a human through steps only they can perform: provisioning infrastructure, setting up credentials or CI secrets, walking an unfamiliar third-party dashboard, or running a one-off migration or cutover.

custom-skills/matt/engineering/ask-matt/PHASE-BOUNDARIES.md

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+# Phase boundaries
+
+A **phase** is a chunk of work inside a session — the grilling, the implementation, the QA. The definition is fuzzy on purpose: a phase ends when you think *"ok, we're done with that"*.
+
+The **phase boundary** is the gap between two phases, and it is the only place this decision belongs. Mid-phase there is no decision to make — continue, or split the work that's left into subagents. Compacting mid-phase makes the agent lose the thread.
+
+## The five options
+
+| Option       | What it does                                                    |
+| ------------ | --------------------------------------------------------------- |
+| **Continue** | Stay in the session. No context switch at all.                    |
+| **`/clear`** | Empty the context window and start from nothing.                  |
+| **`/handoff`** | Write a portable markdown file and seed a session anywhere with it. |
+| **Subagent** | Send the task to its own context window and get a report back.     |
+| **`/compact`** | Compress this context and seed a fresh session with the summary.  |
+
+## The tree
+
+Work top to bottom at the boundary. The first **yes** wins.
+
+**1. Can you continue in this session?** Two things make the answer yes: the next phase needs this phase as a **primary source**, or you have enough [smart zone](https://www.aihero.dev/ai-coding-dictionary/smart-zone) left (~150k tokens) for the next phase to fit. Grilling → implementation is the standard yes: the implementation wants the reasoning verbatim, not a summary of it. Continue costs nothing and loses nothing, so rule it out before anything else.
+
+**2. Is the context irrelevant to what comes next?** Is everything in this session — the exploration, the decisions, the dead ends — disposable? If so, **`/clear`**. It is the cheapest move on the board: it takes no time and hands back the whole window. `/clear` also isn't terminal — the old session stays resumable.
+
+The cost of getting this wrong is one-way. Clear a *relevant* context and you lose the **why** behind what you built, and no amount of reading the diff back gets it returned.
+
+**3. Do you need to hand off?** `/handoff` is narrow. You need it only when you are:
+
+- swapping to a **new harness** (Claude → Codex),
+- moving to a **new directory** or repo,
+- sending the work to a **colleague**,
+- or forking a side task you found **mid-phase** without derailing what you're doing.
+
+That list is the whole clause. What `/handoff` buys is **portability** — a file that travels. If nothing is travelling, you don't need it.
+
+**4. Can the task be done AFK?** Is it scoped tightly enough to run with you away from the keyboard, no steering? Then send it to a **subagent** and leave this session untouched. Automated review is the standard case: the agent reads the diff and reports, and you aren't needed while it does.
+
+**5. Otherwise, `/compact`.** Relevant context, same harness, same directory, and you need to stay in the loop — this is where the tree lands, and it lands here often. Pass it an instruction (`/compact we're going to QA this area`) so the summary keeps what the next phase needs.
+
+`/compact` is the **default, not the first reach**. It sits at the bottom because the four questions above it are all cheaper or more precise. The failure mode when people start here is a fresh session that is confidently wrong about a decision the summary flattened.
+
+## Primary and secondary sources
+
+Every move except **Continue** turns a **primary source** into a **secondary source** — the session as it happened, replaced by a summary of it. The trade is always the same shape:
+
+| Source                            | Information | Noise | Room to move |
+| --------------------------------- | ----------- | ----- | ------------ |
+| Primary (Continue)                | Full        | Lots  | Little       |
+| Secondary (`/compact`, `/handoff`) | Lossy       | Less  | Lots         |
+
+This is why question 1 comes first. You only pay the lossiness when staying costs more than it saves.
+
+## These are judgement calls
+
+The questions are not objective — each has taste in it, and the same boundary can go two ways on two days. The value is in asking them **in order**, at the boundary rather than in the middle of the work.