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Agent skill

Wrdn Effect Schema Boundaries

by UsefulSoftwareCo in UsefulSoftwareCo/executor

Normalize unknown or loosely typed data at boundaries with Effect Schema, named guards, or typed adapters.

MITAuto-check: notes

Install Wrdn Effect Schema Boundaries

skills CLI
$ npx skills add UsefulSoftwareCo/executor --skill wrdn-effect-schema-boundaries -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install UsefulSoftwareCo/executor wrdn-effect-schema-boundaries --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/UsefulSoftwareCo/executor.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/wrdn-effect-schema-boundaries .claude/skills/wrdn-effect-schema-boundaries && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
wrdn-effect-schema-boundaries
GitHub stars
4.1k
Token cost
~392 tokens
SKILL.md length
101 words
Files
1
Skills in repo
21
Repo updated
First seen
Licence
MIT

At a glance

Normalize unknown or loosely typed data at boundaries with Effect Schema, named guards, or typed adapters.

  • Lint flags double casts
  • SKILL.md covers Fix Shape, Good and Bad
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Inline object assertions

What it does

Wrdn Effect Schema Boundaries is an agent skill from UsefulSoftwareCo/executor. Normalize unknown or loosely typed data at boundaries with Effect Schema, named guards, or typed adapters. Use when lint flags double casts, inline object assertions, unknown shape probing, or ad hoc property checks on unknown values.

Its SKILL.md is about 390 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: The missing integration layer for AI agents. Let them call any OpenAPI / MCP / GraphQL / custom js functions in secure environment. The licence is MIT.

When your agent uses it

  • Lint flags double casts
  • Inline object assertions
  • Unknown shape probing
  • Ad hoc property checks on unknown values

Example prompts

  • “/wrdn-effect-schema-boundaries”

Requirements

  • Pre-approved tools (allowed-tools): Read, Grep, Glob, Bash

What it can do on your machine

Read from SKILL.md and the folder at commit 27dccb8. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves these tools, so the agent can use them without asking each time:

    • Read
    • Grep
    • Glob
    • Bash

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Wrdn Effect Schema Boundaries loads about 392 tokens when it runs. Until then it costs about 66 tokens; SKILL.md has 101 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~66
When it runs · the whole SKILL.md, loaded when a task matches
~392

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
    allowed-tools: Read, Grep, Glob, Bash

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from UsefulSoftwareCo/executor at commit 27dccb8, republished under its MIT licence (© UsefulSoftwareCo). 101 words, ~392 tokens.

Download SKILL.mdSave it as .claude/skills/wrdn-effect-schema-boundaries/SKILL.md (or your agent's skills folder).
name
wrdn-effect-schema-boundaries
description
Normalize unknown or loosely typed data at boundaries with Effect Schema, named guards, or typed adapters. Use when lint flags double casts, inline object assertions, unknown shape probing, or ad hoc property checks on unknown values.
allowed-tools
Read, Grep, Glob, Bash

You fix one pattern: domain code is asserting or probing an unknown shape instead of parsing it once at the boundary.

Fix Shape

  • Prefer Schema.decodeUnknownEffect(MySchema)(value) for untrusted input.
  • Prefer Schema.decodeUnknownEffect(Schema.fromJsonString(MySchema))(text) or Schema.decodeUnknownOption(Schema.parseJson())(text) for JSON strings.
  • Keep domain code typed after the decode; do not keep unknown and probe it repeatedly.
  • Replace JSON.parse, value as string, as unknown as X, as Record<string, unknown>, inline object assertions, "field" in value, and Reflect.get with a schema, typed adapter, or named guard.
  • A named guard is acceptable only when parsing is not the right abstraction and the guard has a precise return type.

Good

ts
const ParsedConfig = Schema.Struct({
  endpoint: Schema.String,
});

const config = yield * Schema.decodeUnknownEffect(ParsedConfig)(raw);
ts
const config = yield * Schema.decodeUnknownEffect(Schema.fromJsonString(ParsedConfig))(rawText);

Bad

ts
const config = raw as unknown as { endpoint: string };
ts
const config = JSON.parse(rawText) as { endpoint: string };
ts
const pattern = updated.pattern as string;

© UsefulSoftwareCo, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .agents/skills/wrdn-effect-schema-boundaries of UsefulSoftwareCo/executor.

Open the folder on GitHubat commit 27dccb8

Compare with similar skills

Wrdn Effect Schema Boundaries next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Wrdn Effect Schema Boundaries compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Wrdn Effect Schema Boundaries this skillUsefulSoftwareCo/executor4.1k—~392Automated safety check: NotesMIT
Rust Path Typesopeninterpreter/openinterpreter69k2 repos~605Automated safety check: PassApache-2.0
Python Type Safetywshobson/agents40k—~1.4kAutomated safety check: PassMIT
Pyrefly Type Coveragepytorch/pytorch104k—~3kAutomated safety check: PassCustom licence
Typed Dependencies with fp-go EffectIBM/fp-go2k—~4.3kAutomated safety check: PassApache-2.0
Add Effectremotion-dev/remotion62k—~2.8kAutomated safety check: PassCustom licence

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Questions about Wrdn Effect Schema Boundaries

What does Wrdn Effect Schema Boundaries do?

Normalize unknown or loosely typed data at boundaries with Effect Schema, named guards, or typed adapters. Wrdn Effect Schema Boundaries is an agent skill from UsefulSoftwareCo/executor. Normalize unknown or loosely typed data at boundaries with Effect Schema, named guards, or typed adapters.

When should I use Wrdn Effect Schema Boundaries?

Wrdn Effect Schema Boundaries fits situations like: lint flags double casts; inline object assertions; unknown shape probing; ad hoc property checks on unknown values.

How do I install Wrdn Effect Schema Boundaries in Claude Code?

Run `npx skills add UsefulSoftwareCo/executor --skill wrdn-effect-schema-boundaries -a claude-code`. Or copy the skill folder (.agents/skills/wrdn-effect-schema-boundaries in UsefulSoftwareCo/executor) into .claude/skills/wrdn-effect-schema-boundaries in your project. Claude Code loads it when a task matches its description.

How do I install Wrdn Effect Schema Boundaries in Codex?

Run `npx skills add UsefulSoftwareCo/executor --skill wrdn-effect-schema-boundaries -a codex`. Or copy the skill folder (.agents/skills/wrdn-effect-schema-boundaries in UsefulSoftwareCo/executor) into .agents/skills/wrdn-effect-schema-boundaries in your project. Codex loads it when a task matches its description.

Can I use Wrdn Effect Schema Boundaries in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add UsefulSoftwareCo/executor --skill wrdn-effect-schema-boundaries -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/wrdn-effect-schema-boundaries, .gemini/skills/wrdn-effect-schema-boundaries, .github/skills/wrdn-effect-schema-boundaries and .opencode/skills/wrdn-effect-schema-boundaries in your project.

What does Wrdn Effect Schema Boundaries need to run?

SKILL.md names no scripts, command-line tools or credentials: Wrdn Effect Schema Boundaries is instructions for the agent only. Its frontmatter pre-approves these tools: Read, Grep, Glob, Bash.

Does Wrdn Effect Schema Boundaries access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Wrdn Effect Schema Boundaries safe to install?

Our automated static check of SKILL.md found notes only (pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. Review the folder before installing.

What licence does Wrdn Effect Schema Boundaries use?

Wrdn Effect Schema Boundaries is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Wrdn Effect Schema Boundaries use?

About 392 tokens (SKILL.md is roughly 1.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Wrdn Effect Schema Boundaries?

Skills that share tags, products or a category with Wrdn Effect Schema Boundaries: Rust Path Types (openinterpreter/openinterpreter, 69k stars), Python Type Safety (wshobson/agents, 40k stars), Pyrefly Type Coverage (pytorch/pytorch, 104k stars) and Typed Dependencies with fp-go Effect (IBM/fp-go, 2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Wrdn Effect Schema Boundaries?

UsefulSoftwareCo (a GitHub organization) maintains it in UsefulSoftwareCo/executor, which has 4,094 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on October 8, 2026.

Source: UsefulSoftwareCo/executor on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.