cover

A command that adds behavioral tests for code you changed. These tests verify observable results and important edge cases.

In plain words
What is it for?
Use it on selected files or the current code diff to create tests, verify they fail before the change, and run them afterward.
Why use it?
It reduces the risk of changing code without adding tests that would detect a regression.

Command

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.

agentmods
npx agentmods add commands/localplugins/plugins/cover
Clone the repo
git clone --depth 1 https://github.com/localplugins/plugins
Per session 20 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 243 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00020 $0.00243
Opus 5 $0.00010 $0.00121
Sonnet 5 $0.00004 $0.00049
Haiku 4.5 $0.00002 $0.00024

Measured yesterday against content hash ae8b2e4b1730, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

cover 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 yesterday.

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.

green-keeper/commands/cover.md · 19 lines

What it actually says

Cover

Add real tests for what changed. Arguments: $ARGUMENTS

Workflow

  1. Config. Read .green-keeper/config.json (run /green-setup first if missing).
  2. Scope. Determine the changed code to cover: the paths in the arguments, else the working-tree diff (git diff + staged).
  3. Write tests. For each changed unit, delegate to the test-writer subagent (behavioral tests per test-quality, matching the repo's framework/layout).
  4. Guard. Delegate to the green-guardian subagent for revert-verification — every new/updated test must fail on the pre-change code and pass after. Reworked if not.
  5. Run. Execute the new tests; confirm green.
  6. Report. List the behaviors now covered and where the tests live.

Never write tautological or mock-only tests. Never access the network.

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. yesterday First seen · 19 lines · 20 tokens per session scan A ae8b2e4b1730

Subscribe to this mod's changes

cover is a command published in the GitHub repository localplugins/plugins (5 stars, last pushed 1mo ago), licensed MIT. It adds 20 tokens to every session and 243 once invoked, about $0.0001 per session on Opus 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 2026-08-31.