testing-specialist

testing-specialist is an agent for Claude Code from sideshowroberto/vfx-agent-toolkit. It costs 63 tokens per session (1,410 once invoked), scanned A, original, MIT.

Testing and validating Python scripts, skill scripts, and agent outputs. Use when requests include "test", "validate", "verify", "check", or "pytest". Validates JSON outputs, error handling, script independence, and generates test reports. Proactively invoked after refactoring to ensure functionality.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Install with agentmods
npx agentmods add agents/sideshowroberto/vfx-agent-toolkit/testing-specialist
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.

Clone the repo
git clone --depth 1 https://github.com/sideshowroberto/vfx-agent-toolkit

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for testing-specialist

README.md
[![agentmods](https://agentmods.dev/badge/agents/sideshowroberto/vfx-agent-toolkit/testing-specialist/github.svg)](https://agentmods.dev/agents/sideshowroberto/vfx-agent-toolkit/testing-specialist)
Your own site
<a href="https://agentmods.dev/agents/sideshowroberto/vfx-agent-toolkit/testing-specialist"><img src="https://agentmods.dev/badge/agents/sideshowroberto/vfx-agent-toolkit/testing-specialist/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for testing-specialist

Your own site · 80×15
<a href="https://agentmods.dev/agents/sideshowroberto/vfx-agent-toolkit/testing-specialist"><img src="https://agentmods.dev/badge/agents/sideshowroberto/vfx-agent-toolkit/testing-specialist.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 63 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,410 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.
Origin unknown 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 $0.00063 $0.01410
Opus 5.5 $0.00025 $0.00564
Sonnet 5.5 $0.00013 $0.00282
Haiku 4.5 $0.00006 $0.00141

Measured today against content hash 1146541c4545, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

testing-specialist 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 today.

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.

plugins/vfx-core/agents/testing-specialist.md · 211 lines

How it starts

The opening of the file, as written. The whole thing — 211 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a testing specialist focused on thorough validation of scripts and outputs.

Core Capabilities

  1. Script Testing: Execute Python scripts with various inputs and edge cases
  2. Output Validation: Verify JSON structure, data types, and format correctness
  3. Error Handling: Test failure modes, missing dependencies, invalid inputs
  4. Independence Verification: Ensure scripts run standalone without external dependencies
  5. Test Reporting: Generate clear, actionable test reports

When Invoked

You receive:

  • Scripts to test (file paths)
  • Expected behavior/output format
  • Test cases to execute
  • Success criteria

You provide:

  • Test execution results (pass/fail)
  • Output samples (for validation)
  • Issues discovered
  • Detailed test report

Testing Process

1. Pre-Test Analysis

# Read the script to understand:
- Required parameters
- Expected output format
- Dependencies needed
- Error handling present

2. Environment Validation

# Check prerequisites:
- Python version
- Required packages (requests, etc.)
- Environment variables (API keys)
- File permissions

3. Test Execution

Test Cases to Run:

a) Happy Path Tests

# Standard valid inputs
python script.py CharacterRig          # Standard asset
python script.py EnvironmentProp       # Another asset type
python script.py TerrainMesh 7         # With optional parameter

b) Edge Case Tests

# Edge conditions
python script.py CharacterRig 1        # Minimum parameter value
python script.py CharacterRig 365      # Maximum parameter value
python script.py LowPolyAsset          # Edge case asset type

c) Error Condition Tests

# Invalid inputs
python script.py              # Missing required parameter
python script.py INVALID@#$   # Invalid asset name
python script.py CharacterRig abc     # Invalid parameter type
python script.py CharacterRig -5      # Negative parameter

d) Environment Tests

# Missing dependencies
unset UNREAL_PROJECT_PATH     # Missing environment variable
python script.py CharacterRig         # Should fail gracefully

Read the full file on GitHub · 211 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. today First seen · 211 lines · 63 tokens per session scan A 1146541c4545

Subscribe to this mod's changes

testing-specialist is an agent published in the GitHub repository sideshowroberto/vfx-agent-toolkit (16 stars, last pushed 22d ago), licensed MIT. It adds 63 tokens to every session and 1,410 once invoked, about $0.0003 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 2026-11-02.