mutation-testing

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Author updated Aug 25, 2026, 07:09 AM
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Interpretation is structured for decision-making; original keeps the upstream SKILL.md unchanged.

Decide Fit First

Core job: Configures mewt or muton mutation testing campaigns — scopes targets, tunes timeouts, and optimizes long-running runs. Use when…
Best fit: Use it when the task has reusable inputs, steps, and validation criteria rather than a one-off answer.
Avoid forcing it: If the source lacks commands, platform support, or external-service evidence, keep those fields unknown instead of guessing.

Design Intent

Structure: The skill is organized around “When to Use”, “When NOT to Use”, “Quick Start”, “Reference Index”, showing how the author expects the agent to judge fit, collect context, and produce verifiable output.
Trigger evidence: Prioritize the author’s wording around when to use it, what context to collect, and what output shape to produce.
Evidence boundary: Author text states facts, repository files prove commands and paths, and Fluxly only adds fit, limits, and usage judgment.

How To Use It

Inputs: Provide target material, scope, expected result, forbidden changes, and validation method.
Invocation: Name mutation-testing directly; if the source includes slash commands, start with the command and then add task context.
Validation: Start small and check whether the result follows “When to Use / When NOT to Use / Quick Start” before expanding.

Boundaries And Review

Dependencies: It usually needs no extra API key, so start with a small validation task.
Permissions: Declared permissions include read / write; ask the agent to state file, command, and rollback boundaries before acting.
Quality bar: A useful result names the deliverable, evidence, and next action. Generic prose means the task needs tighter context.

Mutation Testing — Campaign Configuration (mewt/muton)

Note: muton and mewt share identical interfaces but target different languages — mewt for general-purpose languages (Rust, Solidity, Go, TypeScript, JavaScript), muton for TON smart contracts (Tact, Tolk, FunC). All examples use mewt commands, but they work exactly the same with muton. File names change accordingly: mewt.toml → muton.toml, mewt.sqlite → muton.sqlite.

When to Use

Use this skill when the user:

Mentions "mewt", "muton", or "mutation testing"
Needs to configure or optimize a mutation testing campaign
Wants to run mewt run and needs help getting set up first

When NOT to Use

Do not use this skill when the user:

Wants to analyze or report on completed campaign results
Asks about tests or coverage without mentioning mutation testing

Quick Start

Load workflows/configuration.md — a 5-phase guide from mewt init to a validated, ready-to-run campaign.

General question or unfamiliar command? Run mewt --help or mewt <subcommand> --help, then assist.

Reference Index

File	Content
workflows/configuration.md	5-phase guide: init, scope, optimize, validate, run
references/optimization-strategies.md	Per-file targeting, two-phase campaigns, mutation type filtering

Essential Commands

# Initialize and mutate
mewt init                    # Create mewt.toml and mewt.sqlite
mewt mutate [paths]          # Generate mutants without running tests
mewt run [paths]             # Run the full campaign

# Inspect configuration and scope
mewt print config            # View effective configuration
mewt print targets           # Table of all targeted files
mewt print mutations --language [lang]  # Available mutation types
mewt status                  # Mutant count and per-file breakdown

# Investigate specific mutants
mewt print mutants --target [path]   # All mutants for a file
mewt print mutants --severity high   # Filter by severity
mewt print mutant --id [id]          # View mutated code diff
mewt test --ids [ids]                # Re-test specific mutants

What Results Mean

Caught/TestFail: Tests detected the mutation (good)
Uncaught: Mutation survived — indicates untested logic
Timeout: Tests took too long, inconclusive
Skipped: A more severe mutant already failed on the same line

Fluxly profile Author and license come from source; runtime, permissions, and network are Fluxly detections or estimates

Fluxly category: Other
Author-declared agents: No explicit declaration found; this is not inferred or tested compatibility
Static check: 88 / 100 · heuristic scan, not runtime safety proof
Author / version / license: @trailofbits · no license declared
Fluxly token estimate: Lean
Fluxly setup estimate: Plug-and-play
External API key: No requirement detected
Detected OS requirements: Unspecified
Runtime requirements: Unspecified
Detected file/system behavior: Read-only
Write / modify
Detected network behavior: Local-only
Install commands: None (reference only)

Profile is derived at build time from SKILL.md and install vectors. Subject to drift from author intent.

Heads up: 未限定 allowed-tools，默认拥有全部工具权限。

Output preview mutation-testing.preview

# What Results Mean

- **Caught/TestFail**: Tests detected the mutation (good)
- **Uncaught**: Mutation survived — indicates untested logic
- **Timeout**: Tests took too long, inconclusive
- **Skipped**: A more severe mutant already failed on the same line

SKILL.md SKILL.md

# Mutation Testing — Campaign Configuration (mewt/muton)

> **Note**: muton and mewt share identical interfaces but target different languages — mewt for general-purpose languages (Rust, Solidity, Go, TypeScript, JavaScript), muton for TON smart contracts (Tact, Tolk, FunC). All examples use `mewt` commands, but they work exactly the same with `muton`. File names change accordingly: `mewt.toml` → `muton.toml`, `mewt.sqlite` → `muton.sqlite`.

## When to Use

Use this skill when the user:
- Mentions "mewt", "muton", or "mutation testing"
- Needs to configure or optimize a mutation testing campaign
- Wants to run `mewt run` and needs help getting set up first

## When NOT to Use

Do not use this skill when the user:
- Wants to analyze or report on completed campaign results
- Asks about tests or coverage without mentioning mutation testing

---

## Quick Start

Load [workflows/configuration.md](workflows/configuration.md) — a 5-phase guide from `mewt init` to a validated, ready-to-run campaign.

**General question or unfamiliar command?**
Run `mewt --help` or `mewt <subcommand> --help`, then assist.

---

## Reference Index

| File | Content |
|------|---------|
| [workflows/configuration.md](workflows/configuration.md) | 5-phase guide: init, scope, optimize, validate, run |
| [references/optimization-strategies.md](references/optimization-strategies.md) | Per-file targeting, two-phase campaigns, mutation type filtering |

---

## Essential Commands

```bash
# Initialize and mutate
mewt init                    # Create mewt.toml and mewt.sqlite
mewt mutate [paths]          # Generate mutants without running tests
mewt run [paths]             # Run the full campaign

# Inspect configuration and scope
mewt print config            # View effective configuration

…

Evidence boundary and execution chain

Author text anchors workflow facts; Fluxly only indexes current sections, terms, files, and commands.

sections -> When to Use → When NOT to Use → Quick Start → Reference Index → Essential Commands → What Results Mean
terms    -> Note · General question or unfamiliar command? · Caught/TestFail · Uncaught · Timeout · Skipped
files/cmd -> mewt · muton · mewt.toml · muton.toml · mewt.sqlite · muton.sqlite · mewt run · mewt init
body sha256 -> 6b1e852634de