forge

What this plugin does

Description:

Adversarial code hardening for Claude Code. Forge spawns two agents — a Builder and a Breaker — that iterate against each other until the code is unbreakable. The Builder implements a feature, the Breaker writes adversarial tests to prove bugs, and the Builder must fix the implementation without deleting or weakening the tests. The loop continues until the Breaker can't produce a failing test. The result is battle-tested code with a permanent adversarial test suite.

Key features:

- Evidence-based, not opinion-based. Every issue the Breaker raises must have a failing test that proves the bug. No test, no break. This eliminates false positives and subjective feedback.
- Iterative adversarial loop. Builder and Breaker are separate agents that go back and forth for up to N rounds. The Builder cannot dismiss feedback; it must make the failing tests pass.
- Adversarial tests are permanent. The Breaker's tests stay in the repo under tests/adversarial/ as a regression suite. Future changes are protected by the same tests that originally caught the bugs.
- Automatic checkpoint. Creates a git tag before starting so the entire forge session can be rolled back with one command.
- Configurable rounds. Default 5 rounds, adjustable with --rounds N. Stops early if the Breaker can't find issues.
- Auto-detects project stack. Reads config files to determine language, test framework, and conventions. Works with Python, TypeScript, Rust, Go, Ruby, and anything with a test runner.

Catalog observations

Sources

Community

Works with

Claude Code

Reported installs

Not provided

First observed

2026-10-03 22:13 UTC

Last observed

2026-10-08 18:00 UTC

Installation counts are reported by Claude Marketplace, not independently verified active users. Observation dates are not release dates. Pricing and account requirements must be checked with the publisher.

Install in Claude Code

Choose a source and review what the plugin adds before installing.

Community

/plugin marketplace add anthropics/claude-plugins-community
/plugin install forge@claude-community

Claude Code installation documentation

Source evidence

Listing and manifest JSON

Descriptions and compatibility labels come from the linked sources. Where both sources match, the GitHub description is used because web summaries may be shortened. We have not independently tested the declared capabilities.