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TileMap Review · randallliuxin | DecimalAI

randallliuxin/tilemap-review

NewSkillScoreMaintained

Reviews Godot TileMap implementation for known pitfalls. Triggers AFTER implementation, when code involves TileMapLayer, TileSet, TileSetAtlasSource, TileSetScenesCollectionSource, terrain painting, set_cell, erase_cell, get_cell_tile_data, collision polygons on tiles, or NavigationRegion2D with tile-based navigation. Do NOT use this skill for planning or teaching — only for post-implementation review.

Code Reviewby randallliuxin

Links this skill to your agents and keeps it current with the author’s updates.

Automatic

Coding pack

1 · One-time — install the CLI (docs ↗)

pip install decimalai

2 · Get the skill — writes .claude/skills/randallliuxin-tilemap-review/SKILL.md

decimalai skills pull randallliuxin-tilemap-review --out .claude/skills/

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/randallliuxin-tilemap-review/SKILL.md https://app.decimal.ai/s/randallliuxin-tilemap-review/SKILL.md

Raw file: /s/randallliuxin-tilemap-review/SKILL.md ↗ · machine-readable summary at /s/randallliuxin-tilemap-review.json ↗

In productionGlobal

how this skill behaves on real traffic · last 30 days

No production data for this skill yet — usage numbers appear here once agents start running it.

Anonymized aggregate across every org using this skill — proof from real production use, not a demo.

Does this skill help? · Benchmark: with vs. withoutsign in to run this on your agents

22 test cases from the publisher’s eval.yaml · each run twice on gemini-3.6-flash — with the skill injected, then without · last run 25h ago

Yes — +18% lift-30% tokens0% turns77% of whole cases pass with skill (17/22)

Test case	Without → With	Effect	Δ tokens	Δ turns
case-05	✗→✓	▲ Improved	-43%	0%
case-07	✗→✓	▲ Improved	-47%	0%
case-08	✗→✓	▲ Improved	-65%	0%
case-09	✗→✓	▲ Improved	-65%	0%
case-19	✗→✓	▲ Improved	-66%	0%

Showing 5 of 22 cases

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

randallliuxin / godotmaker

skills/reviewer/tilemap/SKILL.md

View on GitHub ↗

License NOASSERTIONImported 8/3/2026Version v1

Skill contents

SKILL.md

TileMap Review

Post-implementation reviewer for Godot TileMap code. Checks against known gotchas that LLMs consistently get wrong.

When to trigger

After TileMap-related code is written or modified. Look for:

TileMapLayer, TileSet, TileSetAtlasSource, TileSetScenesCollectionSource nodes
Cell operations (set_cell, erase_cell, set_cells_terrain_connect)
TileData access (get_cell_tile_data)
Collision/navigation polygon configuration on tiles
y_sort_enabled on TileMapLayer
NavigationRegion2D with TileMapLayer children

Review process

Read gotchas.md
Scan the implemented code against each gotcha
For each hit:

Cite the gotcha ID (e.g. G1)
Show the offending code
Provide the fix

If no hits, report clean
Optionally run checklist.md static checks for automated verification

When you need specific API details, delegate to the godot-api skill.

Want to see if randallliuxin/tilemap-review would activate on your phrasing? Try it before you install — no LLM call, no signup.

Latest benchmark · publisher runVerified

8/20/2026, 02:52 UTC · 22 cases

Lift

+18%

77% vs 59%

Agent turns

1.0 vs 1.0

Tokens

-30%

1,210.05 vs 1,719

fail → pass · 5pass → pass · 12fail → fail · 4pass → fail · 1

Per-case results (22)

Case	Status	Duration (ms)			Turns			Tokens			Tool calls
Case	Status	Without	With	Δ	Without	With	Δ	Without	With	Δ	Without	With	Δ
case-14 A scene has a NavigationRegion2D node with a TileMapLayer child node, but navigation polygons are not rebaking properly. What gotcha should be checked during review?	pass→pass	16,854	11,158	-34%	1	1	0%	2,547	1,965	-23%	0	0	—
case-01 I've updated our 2D character interaction script to clear tiles using erase_cell and adjust y_sort_enabled on a TileMapLayer node. Can you scan the script for tilemap gotchas? List each finding with its issue tag, the problematic lines, and the recommended solution, or state that no issues were found.	fail→fail	6,321	7,108	+12%	1	1	0%	950	1,361	+43%	0	0	—
case-02 Review this Godot GDScript that handles 2D RigidBody2D impulses and state sync during _integrate_forces. Point out any general physics engine integration bugs or state synchronization mistakes.	fail→fail	12,145	5,898	-51%	1	1	0%	1,982	1,183	-40%	0	0	—
case-03 Please review my Godot Control node script responsible for responsive UI layout resizing, anchor margins, and container theme overrides. Identify any standard UI layout errors.	fail→fail	8,944	8,065	-10%	1	1	0%	1,515	1,468	-3%	0	0	—
case-04 Examine this Godot canvas_item shader written in shading language for water surface distortion. Check for invalid texture UV lookups or uniform declaration syntax errors.	fail→fail	5,565	7,111	+28%	1	1	0%	945	1,602	+70%	0	0	—
case-05 I wrote a Godot GDScript snippet that uses set_cell on a TileMapLayer with hardcoded tile source IDs. Review it for mistakes. How should each identified flaw be labeled in your response?	fail→pass	14,357	6,446	-55%	1	1	0%	2,481	1,409	-43%	0	0	—
case-06 Here is a perfectly valid Godot 4 GDScript using TileMapLayer.set_cell(Vector2i(0, 0), 0, Vector2i(1, 1)) without missing parameters or deprecated calls. Please conduct a review. What should the review conclude if no gotcha violations exist?	pass→pass	6,846	3,540	-48%	1	1	0%	1,177	893	-24%	0	0	—
case-07 During your review of my GDScript TileMapLayer code, you notice an unfamiliar method call signature on TileSetAtlasSource. Which specialized domain helper should be consulted for exact Godot API parameter signatures?	fail→pass	6,219	1,693	-73%	1	1	0%	918	485	-47%	0	0	—
case-08 After completing the manual scan of my GDScript map generator for tile errors, what optional static verification step can be executed to run automated sanity checks?	fail→pass	13,255	3,061	-77%	1	1	0%	1,939	672	-65%	0	0	—
case-09 Before scanning Godot TileMap code for implementation errors, what document containing known LLM error patterns should be consulted as the primary reference?	fail→pass	8,506	1,677	-80%	1	1	0%	1,284	451	-65%	0	0	—
case-10 I wrote a script using erase_cell(-1, Vector2i(4, 5)) in GDScript. When performing a tile code review on this operation, what key requirement should be highlighted regarding tile clearing in Godot 4?	pass→pass	11,869	9,611	-19%	1	1	0%	2,038	2,005	-2%	0	0	—
case-11 Our procedural generator calls set_cells_terrain_connect on a TileMapLayer with an array of Vector2 coordinates instead of Vector2i. What issue should be flagged during review?	pass→pass	11,396	6,264	-45%	1	1	0%	1,858	1,312	-29%	0	0	—
case-12 My Godot script attempts to access tile custom data directly via get_cell_tile_data without checking if the target cell exists or returns null. What review step is required?	pass→pass	8,392	5,476	-35%	1	1	0%	1,364	1,046	-23%	0	0	—
case-13 A developer enabled y_sort_enabled on a TileMapLayer but left the parent node's y_sort_enabled disabled. What issue should the review highlight?	pass→pass	7,852	6,668	-15%	1	1	0%	1,158	1,276	+10%	0	0	—
case-15 When reporting hits during a Godot tile map code review, what structural components must be included for each finding?	pass→pass	14,710	2,303	-84%	1	1	0%	2,299	548	-76%	0	0	—
case-16 My Godot script creates a TileSetAtlasSource dynamically in code. Should this script trigger a tilemap code review process?	pass→pass	14,160	3,415	-76%	1	1	0%	1,957	700	-64%	0	0	—
case-17 Our level loader interacts with TileSetScenesCollectionSource to instantiate scene tiles. Review this pattern for common Godot 4 API gotchas.	pass→fail	21,570	14,158	-34%	1	1	0%	3,251	2,508	-23%	0	0	—
case-18 A character passes through tiles because collision polygons are configured on the TileSet but collision_layer on TileMapLayer is 0. What finding should be reported?	pass→pass	9,764	6,529	-33%	1	1	0%	1,483	1,237	-17%	0	0	—
case-19 What is the first step in the systematic review process when reviewing Godot code for tilemap issues?	fail→pass	9,727	1,523	-84%	1	1	0%	1,356	458	-66%	0	0	—
case-20 In Godot 4.3, code uses the old TileMap node with multi-layer indexing instead of individual TileMapLayer nodes. What issue tag and recommendation should be provided?	pass→pass	10,146	6,723	-34%	1	1	0%	1,760	1,456	-17%	0	0	—
case-21 Code calls set_cell(layer, coords, source_id, atlas_coords) but passes alternative_tile as an integer in the 4th argument position instead of atlas_coords Vector2i. What bug does this cause?	pass→pass	9,822	7,080	-28%	1	1	0%	1,648	1,439	-13%	0	0	—
case-22 A GDScript passes global_position directly to set_cell without converting it via local_to_map. What gotcha should be reported?	pass→pass	11,560	5,727	-50%	1	1	0%	1,908	1,147	-40%	0	0	—

These cases were also screened by the skill’s intent / safety pass.See the Trust review ↗Reproduce this benchmark in Colab ↗

How this skill was measured

DecimalAI ran this skill against gemini-3.6-flash twice over the same eval suite — once with the skill loaded and once without — and compared the two runs case by case. 22 cases were attempted. The headline lift of +18 percentage points is the difference between those two pass rates over the 22 comparable cases. 2 cases got worse with the skill loaded, and they are included in that figure.

Model measured: gemini-3.6-flash
Graded by: gemini-3.6-flash
Grading method: judged
Verification: verified
Pass rate without the skill: 59.1%
Pass rate with the skill: 77.3%
Cases attempted: 22
Cases counted toward lift: 22
Cases that regressed: 2
Skill version measured: v1
Run completed: 8/20/2026, 02:52 UTC

Measured example — same prompt, with vs. without the skill · from the benchmark run · case case-05

Prompt

I wrote a Godot GDScript snippet that uses set_cell on a TileMapLayer with hardcoded tile source IDs. Review it for mistakes. How should each identified flaw be labeled in your response?

Without the skill loaded, the model failed this case. With it loaded, the same prompt on the same model passed. This is one improved case from the latest verified run; every case, including any that regressed, is in the table above.

Show both answers

SkillScore blends 4 signalsno signals yet

BenchmarkRun a verified benchmark with positive lift

Live evalNeeds ≥20 evaluated traces in 30 days

AI ratingNeeds ≥10 rated traces

AdoptionNeeds ≥10 serves across ≥2 orgs in 30 days

No signals yet — run a benchmark or collect evaluated traces to earn a score.

Verified on gemini-3.6-flash · re-tested yesterday

Other measured skills in the registry, with their headline benchmark lift.