# Validate Output

> A Claude skill from 0-uddeshya-0/agent-skills.

- **Type:** Skill
- **Install:** `agentstack add skill-0-uddeshya-0-agent-skills-validate-output`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [0-uddeshya-0](https://agentstack.voostack.com/s/0-uddeshya-0)
- **Installs:** 0
- **Category:** [AI & ML](https://agentstack.voostack.com/c/ai-and-ml)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [0-uddeshya-0](https://github.com/0-uddeshya-0)
- **Source:** https://github.com/0-uddeshya-0/agent-skills/tree/main/skills/validate-output

## Install

```sh
agentstack add skill-0-uddeshya-0-agent-skills-validate-output
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# skill: validate-output

## purpose
Confirm that output actually answers the question asked, in the format requested, covering all required parts. Catches the two most common output failures: answering a different question, and ignoring format instructions.

## when_to_use
- Output has an explicit format requirement (JSON, numbered list, under N words)
- Task had multiple required parts and you want to verify all were covered
- Output will be parsed programmatically

## when_not_to_use
- Simple single-fact answers with no format requirement
- Creative tasks with no correct output
- You've already run this once on the same output — do not loop

## input
```
output: string              # The response to validate
original_task: string       # What was actually asked
format_required: string     # Format instructions ("JSON", "bullet list", "under 100 words")
required_parts: list        # Specific items that must be present (can be empty)
```

## output
```json
{
  "valid": true | false,
  "issues": [
    { "type": "wrong_answer|missing_part|wrong_format|too_long|too_short", "detail": "string" }
  ],
  "score": "int (0-100)",
  "fix_needed": true | false,
  "suggested_fix": "string | null"
}
```

## instructions

```
Check against four criteria:
1. ANSWERS THE QUESTION: Does it address what was asked? Not a related topic.
2. COVERS REQUIRED PARTS: Are all required_parts present?
3. CORRECT FORMAT: Is format_required followed exactly?
4. RIGHT LENGTH: Is length appropriate? Flag if obviously off.

Score: 100 = all met, 75-99 = minor issues, 50-74 = fix recommended, = 75 AND no wrong_answer issues.
suggested_fix is a single directive, not a rewrite. null if valid.

Return JSON only.
```

## constraints
- Max output tokens: 250
- suggested_fix: one directive only, not a full rewrite
- Do not rewrite the output — diagnose and instruct only

## example

**Input:**
```
output: "Tips for Python: use list comprehensions, avoid globals, write docstrings."
original_task: "List the 3 most common causes of memory leaks in Python web applications."
format_required: "numbered list"
required_parts: ["memory leaks", "web application context"]
```

**Output:**
```json
{
  "valid": false,
  "issues": [
    { "type": "wrong_answer", "detail": "Output gives general Python tips, not memory leak causes" },
    { "type": "missing_part", "detail": "No mention of memory leaks or web app context" },
    { "type": "wrong_format", "detail": "Requested numbered list, got comma-separated prose" }
  ],
  "score": 10,
  "fix_needed": true,
  "suggested_fix": "Rewrite: list exactly 3 causes of memory leaks in Python web apps (e.g. unclosed DB connections, circular references, unbounded caches) in a numbered list."
}
```

## feedback_log

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [0-uddeshya-0](https://github.com/0-uddeshya-0)
- **Source:** [0-uddeshya-0/agent-skills](https://github.com/0-uddeshya-0/agent-skills)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-0-uddeshya-0-agent-skills-validate-output
- Seller: https://agentstack.voostack.com/s/0-uddeshya-0
- Browse the marketplace: https://agentstack.voostack.com/browse

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