docs: split task 15 into 15a-15e after two failed attempts
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Marcos Paulo
@@ -5,9 +5,9 @@ interchangeable here, and the split is not about which is "smartest" — it is
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about which failure mode each task punishes.
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**Honest caveat up front:** I have not benchmarked these three on this
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repository. The routing below is reasoned from task shape and each model's
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known strengths. Validate it cheaply on **task 07** (small, self-contained,
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easy to judge) before fanning out across ten worktrees.
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repository. The routing below is reasoned from task shape and each model's known
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strengths. Validate it cheaply on **task 07** (small, self-contained, easy to
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judge) before fanning out across ten worktrees.
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## Short answer
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@@ -18,22 +18,27 @@ points where M3 is the wrong tool.
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## Routing table
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| Task | Model | Why this one |
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| --- | --- | --- |
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| 01 scaffold + gates | **Codex** | Config-heavy, many interacting tools (Astro + husky + lint-staged + CI), and success is binary — it builds and hooks fire, or not. Codex's long autonomous run-until-green loop suits it, and getting the foundation wrong is expensive later. |
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| 02 design tokens | **Gemini** | Needs the whole CSS corpus in one context (8 stylesheets, ~90 KB) plus **visual judgement on screenshots**. Gemini's long context and multimodal comparison are the differentiator; the others would work file-by-file and miss cross-file drift. |
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| 03 verification net | **Codex** | Writing test tooling with a tight feedback loop. Precision about what an assertion pins matters more than speed. |
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| 04 content schema | **MiniMax-M3** | Small, well-specified, one file. |
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| 05–06 content migration | **MiniMax-M3** | High-volume mechanical string moves with a `diff` as the oracle. Cheap, parallel, verifiable. Exactly M3's sweet spot. |
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| 07 primitives | **MiniMax-M3** | Small components from templates. Use this task to calibrate the whole routing decision. |
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| 08–11 component blocks | **MiniMax-M3 ×4 parallel** | Four bounded tasks, one template each, checklist-gated. Cost per task matters because there are many. |
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| 12–14, 17 pages | **MiniMax-M3** | Bounded, snapshot-diff verified. |
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| 15 full guide | **Codex** | The hard one: 50 KB `app.js`, 12 render functions, tab state, bilingual swap. Long sustained reasoning over interacting pieces; the task most likely to need many iterations against a failing check. |
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| 16 review desk | **Codex** | Same shape and worse — search, filtering, file fetching, six query params, markdown rendering, client-side diff. Highest defect risk in the plan. |
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| 18 motion | **Gemini** | Judging whether motion looks right is perceptual. Feed it before/after captures. |
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| 19 contract re-point | **Codex** | 42 assertions to translate without losing coverage. Meticulous, mechanical, verifiable. |
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| 20 cutover | **you, with M3 assisting** | Touches production publishing. A human should be watching. |
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| review of every task | **Gemini** | Fresh eyes, whole-diff-in-context, and it did not write the code. Never review with the model that wrote it. |
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| Task | Model | Why this one |
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| ------------------------- | -------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| 01 scaffold + gates | **Codex** | Config-heavy, many interacting tools (Astro + husky + lint-staged + CI), and success is binary — it builds and hooks fire, or not. Codex's long autonomous run-until-green loop suits it, and getting the foundation wrong is expensive later. |
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| 02 design tokens | **Gemini** | Needs the whole CSS corpus in one context (8 stylesheets, ~90 KB) plus **visual judgement on screenshots**. Gemini's long context and multimodal comparison are the differentiator; the others would work file-by-file and miss cross-file drift. |
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| 03 verification net | **Codex** | Writing test tooling with a tight feedback loop. Precision about what an assertion pins matters more than speed. |
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| 04 content schema | **MiniMax-M3** | Small, well-specified, one file. |
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| 05–06 content migration | **MiniMax-M3** | High-volume mechanical string moves with a `diff` as the oracle. Cheap, parallel, verifiable. Exactly M3's sweet spot. |
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| 07 primitives | **MiniMax-M3** | Small components from templates. Use this task to calibrate the whole routing decision. |
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| 08–11 component blocks | **MiniMax-M3 ×4 parallel** | Four bounded tasks, one template each, checklist-gated. Cost per task matters because there are many. |
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| 12–14, 17 pages | **MiniMax-M3** | Bounded, snapshot-diff verified. |
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| 15 full guide | **split** | Ran twice on Codex, zero usable commits both times. This table's own swap rule applied: too big, so it became 15a–15e. |
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| 15a guide selector | **Codex** | Collapsing nine near-identical render functions into one island is the reasoning-heavy part that remains. |
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| 15b copy prompt | MiniMax-M3 | Small, mechanical, and has an exact oracle: the clipboard payload must be byte-identical. |
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| 15c language toggle | **Codex** | Needs a design decision written down, not a port — the selector-map approach cannot survive. |
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| 15d assemble full guide | **Codex** | Assembly, but wide: 22 KB of bilingual markup against three islands and task 10's blocks. |
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| 15e retire responsive.css | `agy` | Screenshot-diff driven — needs vision. |
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| 16 review desk | **Codex** | Same shape and worse — search, filtering, file fetching, six query params, markdown rendering, client-side diff. Highest defect risk in the plan. |
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| 18 motion | **Gemini** | Judging whether motion looks right is perceptual. Feed it before/after captures. |
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| 19 contract re-point | **Codex** | 42 assertions to translate without losing coverage. Meticulous, mechanical, verifiable. |
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| 20 cutover | **you, with M3 assisting** | Touches production publishing. A human should be watching. |
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| review of every task | **Gemini** | Fresh eyes, whole-diff-in-context, and it did not write the code. Never review with the model that wrote it. |
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## The reasoning in one line each
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@@ -41,11 +46,11 @@ points where M3 is the wrong tool.
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Use it for volume: 13 of the 20 tasks. Its weakness is long multi-file
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reasoning where the spec is vague; every task above that it owns has a
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template and a mechanical oracle.
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- **Codex** — best at "keep iterating until the check passes" over a
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complicated existing codebase. Use it where the loop is long and the answer is
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not obvious: scaffold, the two hard pages, verification.
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- **Codex** — best at "keep iterating until the check passes" over a complicated
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existing codebase. Use it where the loop is long and the answer is not
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obvious: scaffold, the two hard pages, verification.
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- **Gemini** — biggest context and genuinely useful multimodal comparison. Use
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it where the input is *everything at once* or where the judgement is
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it where the input is _everything at once_ or where the judgement is
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**visual**: token consolidation, motion, screenshot diffing, and code review.
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## Cross-checking rule
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@@ -56,13 +61,13 @@ reviews; Codex writes → Gemini reviews; Gemini writes → Codex reviews. The
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## Swap the routing if you see this
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| Symptom | Move the task to |
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| --- | --- |
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| M3 spends more than ~3 iterations failing the same gate | Codex |
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| M3 edits files outside its task scope | Codex, and tighten the brief |
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| Codex "fixes" a red suite by deleting assertions | anything — but re-read `context/verification.md` to it first; `gate.sh` blocks the merge either way |
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| Gemini gives confident visual sign-off with no screenshots attached | require the artifacts; do not accept prose |
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| A task needs more than two models' worth of hand-holding | the task is too big — split it |
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| Symptom | Move the task to |
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| ------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------- |
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| M3 spends more than ~3 iterations failing the same gate | Codex |
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| M3 edits files outside its task scope | Codex, and tighten the brief |
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| Codex "fixes" a red suite by deleting assertions | anything — but re-read `context/verification.md` to it first; `gate.sh` blocks the merge either way |
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| Gemini gives confident visual sign-off with no screenshots attached | require the artifacts; do not accept prose |
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| A task needs more than two models' worth of hand-holding | the task is too big — split it |
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## Cost shape
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