Wrdn Effect Value Inferred Types

What it does

When your agent uses it

• Review flags an interface/type alias that mirrors a returned object such as a plugin extension

Example prompts

• “/wrdn-effect-value-inferred-types”

Requirements

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

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Find the source value. Look for an object returned from a named factory, extension: (...) => ({ ... }), a client object, route map, or…
2. 2Find the duplicate type. A nearby interface X or type X = { ... } repeats the object methods/properties.
3. 3Check whether the value is the source of truth. If the interface is a contract with multiple implementations, keep the interface.
4. 4Preserve the exported type name. Replace its definition with ReturnType and update callers only if needed.
5. 5Use satisfies only at boundaries. Do not make the implementation satisfy a duplicate shape that could drift.

What it can do on your machine

Read from SKILL.md and the folder at commit 9ef04e9. 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 Value Inferred Types loads about 805 tokens when it runs. Until then it costs about 75 tokens; SKILL.md has 254 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~75

When it runs · the whole SKILL.md, loaded when a task matches

~805

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

• 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 9ef04e9, republished under its MIT licence (© UsefulSoftwareCo). 254 words, ~805 tokens.

name

wrdn-effect-value-inferred-types

description

Replace duplicated object API types with types inferred from the runtime value or factory that owns the shape. Use when lint or review flags an interface/type alias that mirrors a returned object such as a plugin extension, client surface, route map, or handler table.

allowed-tools

Read, Grep, Glob, Bash

const makePluginExtension = (ctx: PluginCtx<Store>) => {
  const addSource = ...
  const removeSource = ...

  return {
    addSource,
    removeSource,
  };
};

export type PluginExtension = ReturnType<typeof makePluginExtension>;

const makePluginExtension =
  (options: PluginOptions) =>
  (ctx: PluginCtx<Store>) => ({
    addSource: ...,
  });

export type PluginExtension = ReturnType<ReturnType<typeof makePluginExtension>>;

export interface McpPluginExtension {
  readonly addSource: (config: McpSourceConfig) => Effect.Effect<AddResult, Failure>;
  readonly removeSource: (namespace: string, scope: string) => Effect.Effect<void, Failure>;
}

extension: (ctx) => {
  return {
    addSource,
    removeSource,
  } satisfies McpPluginExtension;
};

const makeMcpPluginExtension = (ctx: PluginCtx<McpStore>) => {
  return {
    addSource,
    removeSource,
  };
};

export type McpPluginExtension = ReturnType<typeof makeMcpPluginExtension>;

extension: makeMcpPluginExtension;

© 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-value-inferred-types of UsefulSoftwareCo/executor.

Open the folder on GitHubat commit 9ef04e9