error-handler

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

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.

Security

Grade A, and why

error-handler 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 2d 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.

skills/error-handler/SKILL.md · 53 lines

What it actually says

grep -rn "catch\|try\|throw\|Error(" src/ --include="*.ts" -l | head -10
grep -rn "class.*Error" src/ --include="*.ts" | head -10

export class AppError extends Error {
  constructor(
    message: string,
    public readonly statusCode: number,
    public readonly code: string,
    public readonly isOperational = true,
  ) {
    super(message)
    this.name = this.constructor.name
  }
}

export class NotFoundError extends AppError {
  constructor(resource: string) {
    super(`${resource} not found`, 404, 'NOT_FOUND')
  }
}

export class ValidationError extends AppError {
  constructor(details: ZodIssue[]) {
    super('Validation failed', 400, 'VALIDATION_ERROR')
  }
}

export class UnauthorizedError extends AppError {
  constructor() { super('Unauthorized', 401, 'UNAUTHORIZED') }
}

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.

Related

Other skills, from other repositories