Godot Grill

Settle the decisions only the developer can make, before anyone designs a scene tree or writes code. The output is a decision record, not a design.

Related skills: godot-brainstorming for the scene tree, signal map, and plan once decisions are settled, scene-organization for composition vs. inheritance trade-offs, godot-mentor for teaching-mode delivery of what follows.

1. Decisions, not facts

Ask only what only the user knows: intent, constraints, priorities, taste.

Node types, API signatures, and version differences are facts. Look them up (godot-brainstorming/references/node-selection.md, the domain skills), decide, and record the choice. Never spend a question on one.

Architecture choices — data home, state representation, save format — are decided from the user's answers, not asked as technology picks. Ask the constraint behind them ("will designers edit items in the Inspector?"), then map the answer to Resource .tres yourself.

Question	Verdict
"Throwaway prototype, or a system other code builds on?"	Decision — ask
"Should the player be a CharacterBody2D or a RigidBody2D?"	Fact — decide, record it
"When two clients disagree, who is right?"	Decision — ask
"Can a Tween chain steps in 4.3?"	Fact — never ask

2. The seeded dependency tree

Four roots have no prerequisites:

Root	Options
Scope	throwaway slice / one feature / a system others build on
Dimension	2D / 3D / 2.5D
Language	GDScript / C# / both
Authority	single-player / networked (and if networked, who is authoritative)

Settling this…	…unblocks
Scope	prunes branches: a throwaway slice skips persistence, data home, networking, and testing
Authority	state ownership (source of truth); signals vs. RPCs
Dimension	physics model; camera model
Language	interop boundary, when the answer is "both"
Scope + Dimension	entity model: composition vs. inheritance
Entity model	data home (Resource .tres / autoload / node-local @export); communication (signals up, calls down / EventBus / DI)
Authority + Entity model	state representation (enum FSM / node FSM / AnimationTree / none); persistence boundary
Data home + Persistence	save format (ConfigFile / JSON / Resource serialization)

The right-hand column names what an answer lets you decide; ask the user the constraint behind it, never the technology. The tree is a seed, not a script. Answers grow it — "networked" creates branches a single-player answer never does. Skip any root the request or the project already answers (project.godot, existing scripts). Most sessions visit few nodes.

3. Rounds

Before round 1, read where the project keeps decision records, checking in order: the user's instructions or the project's agent instructions file (CLAUDE.md, AGENTS.md, …); then an existing decisions or ADR directory. A recorded decision is a settled prerequisite: never re-ask it; start the frontier past it.

The frontier is every open decision whose prerequisites are settled. Ask the whole frontier in one message, numbered, each with a recommended answer:

❓ **Q1** — **<title>**: <the question, with its options>

➡️ <recommended answer, and why in one clause>

Then stop and wait. A question whose prerequisite is still open belongs to a later round. Everything you ask is in the numbered list: no closing "also, what genre…?" after it. Anything worth asking gets a number and a ➡️; anything else waits for the next round.

Round 1 is small and settles scope first — scope prunes the most tree. A "throwaway slice" answer commonly ends the session at round 2.

After each round, re-derive the frontier from the answers. If an answer contradicts a recorded decision, say so and ask whether to reopen it — never overwrite a record silently.

4. Ending the grill

The grill ends when the frontier is empty, or on the off-ramp: "just build it" / "skip the questions" / "stop grilling", in any round, including the first message. Then stop asking, and list every assumption you are now making for the open decisions, where the user can scan and overrule them.

On the off-ramp there are no confirmation or approval gates: list the assumptions, write the record, and build — with the matching domain skill, or godot-brainstorming from Step 2 without its per-section check-ins.

When the frontier empties, write the record (§5), confirm shared understanding in one message, and wait. Then hand off:

• it needs a scene tree, signal map, or plan → godot-brainstorming, from Step 2
• it is a single known change → the matching domain skill

5. The decision record

GodotPrompter has no decisions folder of its own. Write the record where this project keeps them, checking in order: the user's instructions or the project's agent instructions file (CLAUDE.md, AGENTS.md, …); then an existing decisions or ADR directory. If none applies, ask the user, suggesting docs/decisions/, or use docs/decisions/ when you cannot ask (a subagent or non-interactive run). Name the file YYYY-MM-DD-<topic>.md. The path must stay stable: the next grill reads it back.

# <Topic> — decisions

| Decision | Choice | Why | Revisit when |
|---|---|---|---|
| Bag model | Fixed 20 slots | Grid UI already designed | a weight system is wanted |
| Item data | Resource `.tres` | Inspector editing, typed exports | items exceed ~200 |

## Open / deferred
- Equipment stat aggregation — deferred to a later pass.
- Save slots — **assumed** 1 (off-ramp); revisit before shipping.

Revisit when keeps a decision reopenable, not binding. Off-ramp assumptions go under Open / deferred, marked assumed. If you cannot write files, put the record in your final message instead.

6. Anti-patterns

Anti-pattern	Why it is wrong	Instead
One question at a time	Order fixed in advance; questions arrive before their prerequisites; more turns	Ask the whole frontier
Asking a fact	Spends the user's attention on the model's job	Look it up, decide, record
A question with no recommendation	The user answers in a vacuum; rounds slow down	Every question gets ➡️
A trailing question outside the numbered list	It has no recommendation and is easy to miss when answering by number	Number it, or hold it for the next round
Grilling a bug fix or an explicit ask	The over-correction this skill must not become	Route to the domain skill
Re-asking a recorded decision	Feels like amnesia; wastes the record	Read where the project keeps decision records first
Coding after the last answer	Skips the shared-understanding check	Confirm, then hand off

Checklist

• Read existing decision records before round 1
• Round 1 settled scope first
• Every question is a decision — numbered, with a recommended answer
• Whole frontier per round; waited after each
• Off-ramp taken → assumptions listed
• Record written (or in the final message when files cannot be written)
• Frontier emptied → user confirmed before design or code; off-ramp → no gates, built on the listed assumptions