Mutation Test Generator

Replaces a $55k QA Tester. Mutates code, finds the gaps, drafts the missing tests.

The Problem

An SMB or small dev team spends $55k/yr on a QA Tester who writes unit tests for new PRs and audits coverage. The agent runs Stryker mutation testing — mutates the diff, finds the lines no test catches, drafts the missing tests, opens a follow-up PR.

The Outcome

PR opened → agent runs Stryker against the diff, finds surviving mutants (lines no test catches), drafts the missing tests + opens a stacked PR. Mutation score posted as a PR check.

Day in the Life

On every PR: runs stryker run on the diff'd files only

For every surviving mutant: drafts a unit test that would have killed it

Opens a stacked PR with the new tests + posts the mutation score on the parent PR check

▶Technical specs

Runtime

node

Pattern

native-agent

Tier

heavy

Setup Time

hours

Integrations

one-clickmanual setup

StrykerGitHubJest

Additional Credentials

GITHUB_TOKENANTHROPIC_API_KEY

We connect these securely during setup. OAuth integrations above connect with one click — no manual token entry.

▶Open source info

Repository

stryker-mutator/stryker-js

Stars

2,867

License

Apache-2.0

Last Commit

2026-05-12

Replace

QA Tester

$55,000/yr

AgentDepot · Solo plan

$99/month

Save $53,812/yr · 46.3x cheaper

Request this agent →

Free 15-min setup call · Agent live before you hang up

Also Replaces

×Codecov Pro $29/mo

×Mutating-tester SaaS $50/mo

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