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Tree-sitter Skill · a5c-ai | DecimalAI

codingby a5c-ai

Tree-sitter Skill

a5c-ai/Tree-sitter

Source a5c-ai/babysitter ↗License MIT

Expert skill for creating tree-sitter grammars for incremental parsing and syntax highlighting

SkillScore88Maintained

Automatic

Coding pack

Last verified 8/30/2026

What it changes

Passed 21 of 24 test cases with the skill, and 12 of 24 without it.

Without skill50%

With skill88%

Checks it passed that the model alone missed

The nodeTypes value is an array of strings.
The JSON payload uses property key nodeTypes.
The JSON payload uses property key grammarName.

and 15 more in the full report

9 fixed12 passed either way3 still failing0 broke

Pass-rate lift: +38 pp
Tokens: -19%
Agent turns: 0%
Response time: -22%

Model gemini-3.6-flashMeasured 8/30/2026v121 of 24 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/a5c-ai-tree-sitter/SKILL.md https://app.decimal.ai/s/a5c-ai-tree-sitter/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add a5c-ai-tree-sitter, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

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

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/a5c-ai-tree-sitter/ and pins it in .decimal/skills.lock

decimalai skills add a5c-ai-tree-sitter

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

curl -fsSL --create-dirs -o .claude/skills/a5c-ai-tree-sitter/SKILL.md https://app.decimal.ai/s/a5c-ai-tree-sitter/SKILL.md

Raw file: /s/a5c-ai-tree-sitter/SKILL.md ↗ · machine-readable summary at /s/a5c-ai-tree-sitter.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 9 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 9

Prompt

We need a JSON specification object for a micro-assembly parser using Tree-sitter called 'MicroAsm'. Ensure all schema properties (grammar name, node types, editor queries, bindings, generated files) match official schema naming.

What was checked, without and with the skill
Checked	Without skill	With skill
The JSON object uses top-level key grammarName.	Missed	Passed
The queries field elements are drawn from standard query enum values like highlights or folds.	Passed	Passed

case-24 · gemini-3.6-flash · 8/30/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md66 linessingle file

Tree-sitter Skill

Overview

Expert skill for creating tree-sitter grammars for incremental parsing and syntax highlighting.

Capabilities

Write tree-sitter grammar.js files
Handle tree-sitter external scanners
Design queries for syntax highlighting
Implement incremental parsing support
Handle tree-sitter error recovery
Generate bindings for various languages
Integrate with editors (VS Code, Neovim, Helix)
Test grammars with corpus files

Target Processes

language-grammar-design.js
lexer-implementation.js
parser-development.js
lsp-server-implementation.js

Dependencies

tree-sitter CLI
tree-sitter crates/npm packages

Usage Guidelines

Grammar.js: Follow tree-sitter grammar.js conventions
External Scanners: Use external scanners for context-sensitive lexing
Queries: Write highlight.scm and other query files for editor integration
Testing: Build comprehensive corpus test files
Error Recovery: Design grammar with error recovery in mind

Output Schema

Track record

Benchmark

21 / 24

test cases passed, vs 12 / 24 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/10/2026

View 15 scanner checks

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

a5c-ai / babysitter

library/specializations/programming-languages/skills/tree-sitter/SKILL.md

View on GitHub ↗

License MITImported 8/10/2026Version v1

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

a5c-ai/Parser GeneratorExpert skill for parser generation and implementation using LL, LR, LALR, PEG, and Pratt parsing techniquesClose match+41 pp pass-rate lift

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Tree-sitter Skill

Overview

Capabilities

Target Processes

Dependencies

Usage Guidelines

Output Schema

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills