coverage

A command for finding untested code branches and lines in Solidity projects using Forge, then generating tests for those paths. Coverage measures which parts of the code run during tests; a branch is one possible path through a condition.

In plain words
What is it for?
Use it to measure Forge test coverage, test revert paths and conditional branches, cover loop edge cases, and verify the resulting coverage improvements.
Why use it?
It shows where the test suite misses failure cases, conditions, or edge cases. It then checks whether targeted tests improve those gaps.

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/omermaksutii/rugproof/coverage
Clone the repo
git clone --depth 1 https://github.com/omermaksutii/RugProof
Per session 15 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 423 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 $0.00015 $0.00423
Opus 5 $0.00008 $0.00211
Sonnet 5 $0.00003 $0.00085
Haiku 4.5 $0.00002 $0.00042

Measured 2d ago against content hash f0de67ee0246, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

coverage 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 2d 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.

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.

commands/coverage.md · 56 lines

What it actually says

/coverage — close test coverage gaps

Procedure

Step 1 — Run coverage

mcp__forge-runner__coverage(format=json)

Returns per-file branch / line / function coverage.

Step 2 — Identify gaps

For each file under src/:

  • Lines covered < 90%? Identify which lines.
  • Branches covered < 80%? Identify which branches.

Step 3 — Generate targeted tests

For each gap, generate a test that exercises the uncovered path. Lean on /test-gen infrastructure.

Common gap patterns:

  • Revert branches (require failure paths) — write a test that triggers the revert.
  • Conditional logic (if (x > 10)) — test both arms.
  • Loop edge cases (empty array, single element, max bound).

Step 4 — Re-run coverage

Verify the new tests close the gaps. Iterate.

Step 5 — Output

Coverage:
  Before:  src/Vault.sol      lines 78% / branches 71%
           src/Oracle.sol     lines 92% / branches 84%
  After:   src/Vault.sol      lines 96% / branches 88%   ✓
           src/Oracle.sol     lines 98% / branches 91%   ✓

Generated:
  test/generated/coverage/VaultGaps.t.sol     (12 tests)
  test/generated/coverage/OracleGaps.t.sol    (4 tests)

Notes

  • 100% line coverage is achievable. 100% branch coverage is harder; aim for 90%.
  • Some lines are intentionally untested (e.g. unreachable revert in storage-init). Allow // rugproof-skip-coverage inline.
  • Coverage is a minimum, not a measure of correctness. High coverage + no invariants is misleading.
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. 2d ago First seen · 56 lines · 15 tokens per session scan A f0de67ee0246

Subscribe to this mod's changes

coverage is a command published in the GitHub repository omermaksutii/RugProof (9 stars, last pushed 1mo ago), licensed MIT. It adds 15 tokens to every session and 423 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.