Skip to content
TrustedSkillsbeta
Back to all skills

N8N Expression Testing

Checked
proffesor-for-testing·vlatest·productivity·MIT

Validates n8n workflow expressions against a test environment to identify syntax errors and runtime issues proactively.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add proffesor-for-testing/agentic-qe --skill n8n-expression-testing -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

proffesor-for-testing

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned proffesor-for-testing/agentic-qe at 124d8c735e.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
124d8c735e
Manifest
assets/skills/n8n-expression-testing/SKILL.md
Scanned
8 files, 2,542 lines
Copies in repo
2 — all of them scanned
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill allows AI agents to execute and validate n8n expressions directly within the workflow environment. It enables dynamic testing of logic, data transformations, and conditional statements without requiring manual deployment or external debugging tools.

When to use it

  • Validate complex JSON manipulation logic before committing changes to production workflows.
  • Test conditional branching rules to ensure correct path selection based on input variables.
  • Debug expression syntax errors in real-time during the development phase.
  • Verify data formatting outputs generated by previous workflow nodes.

Key capabilities

  • Direct execution of n8n expression strings within the agent context.
  • Real-time validation of logic and data transformation rules.
  • Support for dynamic variable substitution during test runs.
  • Immediate feedback on syntax errors or logical failures.

Example prompts

  • "Test this n8n expression: {{ $json.amount > 100 ? 'High' : 'Low' }} with input {\"amount\": 50}."
  • "Validate the JSON transformation logic for mapping user roles to permission levels in an n8n workflow."
  • "Run a test on this conditional statement to check if it correctly filters out null values from the array."

Tips & gotchas

Ensure your AI agent has access to valid n8n syntax and variable structures to avoid false positives during testing. Complex expressions involving external API calls may require mocked data inputs for accurate validation within this isolated testing environment.