gen-test-plan

gen-test-plan is a skill for Claude Code from existential-birds/beagle. It costs 25 tokens per session (4,302 once invoked), scanned A, original, Apache-2.0.

A skill that examines a code repository and creates a YAML plan for end-to-end testing. End-to-end testing checks a feature through the same programs and interfaces a user would use.

In plain words
What is it for?
Use it to identify the technology stack, inspect changes, and create tests that build programs, start servers, call endpoints, use real databases, or check command output.
Why use it?
It turns code changes into checks of real user-visible behavior without simply rerunning the project's unit or integration test suite.

Skill for Claude Code

Written for Claude Code: disable-model-invocation in frontmatter. Also seen: mentions CLAUDE.md.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is 3. Run the tests by invoking the **run-test-plan** skill ([run-test-plan](../run-test-plan/SKILL.md)).

Part of the beagle-testing plugin — 2 skills shipped together

Good fit Use it to identify the technology stack, inspect changes, and create tests that build programs, start servers, call endpoints, use real databases, or check command output.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/existential-birds/beagle
agentmods
npx agentmods add skills/existential-birds/beagle/gen-test-plan

Made for: Claude Code.

Or install beagle-testing, the plugin that ships this one along with the rest of its 2 skills.

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 gen-test-plan

README.md
[![agentmods](https://agentmods.dev/badge/skills/existential-birds/beagle/gen-test-plan/github.svg)](https://agentmods.dev/skills/existential-birds/beagle/gen-test-plan)
Your own site
<a href="https://agentmods.dev/skills/existential-birds/beagle/gen-test-plan"><img src="https://agentmods.dev/badge/skills/existential-birds/beagle/gen-test-plan/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 gen-test-plan

Your own site · 80×15
<a href="https://agentmods.dev/skills/existential-birds/beagle/gen-test-plan"><img src="https://agentmods.dev/badge/skills/existential-birds/beagle/gen-test-plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 25 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,302 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin original 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 $0.00025 $0.04302
Opus 5.5 $0.00010 $0.01721
Sonnet 5.5 $0.00005 $0.00860
Haiku 4.5 $0.00003 $0.00430

Measured 1mo ago against content hash e8ebe66d0c6c, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gen-test-plan scanned grade A with 1 finding 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 1mo 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- Start a server and hit it with curl
plugins/beagle-testing/skills/gen-test-plan/SKILL.md · 378 lines

How it starts

The opening of the file, as written. The whole thing — 378 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Generate Test Plan

Analyze the repository's tech stack, branch changes vs default, and generate an executable YAML test plan focused on user-facing impact.

This is an E2E test plan — not an automated test wrapper. The generated plan will be executed by an autonomous agent acting exactly as a human QA tester would: launching real binaries, hitting real endpoints, interacting with real databases, and verifying real observable behavior.

Critical Rule: No Automated Test Duplication

NEVER generate test steps that re-run the project's existing automated test suite. This means:

  • No cargo test, pytest, npm test, go test, mix test, or equivalent commands as test steps
  • No wrapping unit/integration test modules in a test case
  • No "run the tests and check they pass" — that's CI's job, not QA's

If you find yourself writing a test step that invokes the project's test runner, stop and rethink. Ask: "What would a human tester do to verify this feature works?" The answer is never "run the unit tests."

What E2E test steps look like:

  • Build the binary and run it with real arguments, check stdout/stderr/exit code
  • Start a server and hit it with curl
  • Run a CLI command that writes to a real database, then query the database to verify
  • Launch the TUI and verify it renders (via screenshot or process lifecycle)
  • Chain multiple commands that exercise a full user workflow end-to-end

Hard gates

Complete these in order. Do not advance to the next gate until its Pass condition is met (each pass should leave retrievable evidence: pasted command output, a written list, or the generated file on disk). Scheduling: Gate 1 before Step 2; Gate 2 before Step 5; Gate 3 before Step 7; Gates 4–5 during Step 8 (after the Step 7 summary).

  1. Diff and base pinned (after Step 1) — Resolve the base branch from --base when provided, otherwise use the repo default (main or master per Step 1). Compare HEAD to $(git merge-base HEAD origin/<base_branch>) (or equivalent if the remote ref differs). Pass: You record current_branch, base_branch, the merge-base SHA or range used, and changed_files from git diff --name-only <merge-base>..HEAD (empty list allowed if you paste or quote that output and state “no file changes vs base”).

Read the full file on GitHub · 378 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. 1mo ago First seen · 378 lines · 25 tokens per session scan A e8ebe66d0c6c

Subscribe to this mod's changes

gen-test-plan is a skill published in the GitHub repository existential-birds/beagle (82 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 25 tokens to every session and 4,302 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-16.

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