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GocciaScript: Skill for Claude Code

.agents/skills/gocciascript-issue-validation/SKILL.md

gocciascript-issue-validation is a skill for Claude Code, Codex from frostney/GocciaScript. It costs 56 tokens per session (814 once invoked), scanned A, original, MIT.

A project-specific validation guide for GocciaScript engine issues involving test262, the ECMAScript standards test suite, or language and internationalization compatibility. It explains how to check expected behavior against the ECMA-262 and ECMA-402 specifications.

In plain words
What is it for?
Use it alongside an issue-implementation workflow for parser compatibility, ECMAScript behavior, Intl features, or test262 failures. It helps find specification clauses, cross-references, historical changes, and appropriate project tests.
Why use it?
It reduces the risk of fixing a JavaScript-language or internationalization issue based on an incorrect interpretation of the standard. It directs validation toward the relevant specification clauses and project test harness.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: installed under .agents/ (shared by several agents).

This is frostney/GocciaScript's own configuration. It tells Claude Code and Codex how to work on GocciaScript itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything GocciaScript configures →

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is bun scripts/run_test262_suite.ts \.

not rated 20repo changed 8d ago A scan SkillSpector: pass 56 tokens original MIT
View source ↗ frostney/GocciaScript
Reuse

Borrowing it

Nothing to install: this file belongs to frostney/GocciaScript. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/frostney/GocciaScript/main/.agents/skills/gocciascript-issue-validation/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/frostney/GocciaScript

Made for: Claude Code, Codex.

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README.md
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Your own site · 80×15
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Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 814 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00056 $0.00814
Opus 5.5 $0.00022 $0.00326
Sonnet 5.5 $0.00011 $0.00163
Haiku 4.5 $0.00006 $0.00081

Measured 8d ago against content hash 3a6de0a99b95, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gocciascript-issue-validation scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.agents/skills/gocciascript-issue-validation/SKILL.md · 57 lines

How it starts

The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.

GocciaScript Issue Validation

Project-specific validation rules for GocciaScript issues. Use this skill with the generic implement workflow when the issue references test262, ECMAScript/ECMA-402 behavior, or compatibility flags.

Spec Lookup

For ECMA-262 or ECMA-402 semantics, use the pinned [email protected] server from the project MCP config under .agents/mcp/ when it is available. tc39-mcp spec-reading tools default to ECMA-262, so pass the spec explicitly for the standard you are checking:

  • ECMA-262 language/core built-ins: spec: "262"
  • ECMA-402 Intl behavior: spec: "402"
  1. Use spec.search when the exact clause id is unknown, for example spec.search({ spec: "402", query: "Intl.DateTimeFormat" }) for Intl work.
  2. Use clause.get for the relevant clause before deciding expected behavior, for example clause.get({ spec: "402", id: "sec-intl.datetimeformat" }).
  3. Use spec.crossrefs when behavior depends on abstract operations or cross-spec references. For ECMA-402 algorithms that call ECMA-262 operations, start from spec: "402" and set include_cross_spec: true.
  4. Use spec.diff or spec.history with the same explicit spec when the issue may involve recent prose drift.
  5. Use test262.search to map a clause id or feature area to conformance tests.
  6. Use test262.get to inspect a specific conformance test when the MCP server returns one.
  7. Use proposal.list or proposal.get for proposal-stage features.

Record the spec, edition, clause id, section number, and snapshot SHA when the MCP response provides one. If tc39-mcp is not available, fall back to the official TC39 sources (tc39.es/ecma262, tc39.es/ecma402) rather than guessing.

Test262 Validation

When an issue references test262 files, patterns, or categories:

  1. Read docs/test262.md before running the reproduction.
  2. Use scripts/run_test262_suite.ts with GocciaScriptLoaderBare; do not run stock test262 files directly through GocciaRunner, GocciaTestRunner, or hand-built wrappers.
  3. Use the pinned test262 SHA from .github/workflows/pr.yml or .github/workflows/ci.yml unless the issue explicitly targets another SHA.
  4. Build the bare loader from a clean artifact state first:

Read the full file on GitHub · 57 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 8d ago Changed · -1 lines 3a6de0a99b95
  2. 11d ago Changed c9ce963b8785
  3. 26d ago Changed fa8e5b9fc74f
  4. 29d ago Changed · -2 tokens per session 62c1a7ba9df9
  5. 1mo ago Changed da0b05ac1916
  6. 1mo ago First seen · 58 lines · 58 tokens per session scan A 36cef952c81c

Subscribe to this mod's changes

gocciascript-issue-validation is a skill published in the GitHub repository frostney/GocciaScript (20 stars, last pushed yesterday), licensed MIT. It adds 56 tokens to every session and 814 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

LanguagesTestingecmascriptfpcfreepascalinterpreterjavascriptpascal
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