# What tasks can Cosine complete end-to-end?

**Cosine can autonomously complete a wide range of engineering tasks — from fixing bugs and writing tests to building new features, refactoring code, and generating documentation.** Each task is handled through Cosine’s autonomous agent loop: understand, plan, write, validate, and deliver a pull request.

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### Common task categories

#### Bug fixes

Cosine identifies, reproduces, and resolves bugs across repositories. It can patch small issues automatically or propose solutions for complex bugs requiring review.

#### Feature development

Cosine implements new functionality based on specifications or Jira tickets. It retrieves relevant context, writes code, updates dependencies, and ensures the feature integrates cleanly with the existing system.

#### Refactoring & migrations

Cosine performs refactors (e.g., upgrading APIs or moving from one framework to another) and automates dependency updates. It handles repetitive, large-scale changes across repos while maintaining code quality.

#### Test generation

Cosine writes and runs unit, integration, and regression tests. Its reinforcement-trained model understands test design patterns and avoids bias from its own implementation.

#### Documentation (AutoDoc)

Cosine’s **AutoDoc** feature generates or updates documentation for your codebase — helping teams maintain clarity even as projects evolve.

#### CI/CD integration

Cosine can work within your CI/CD pipeline, triggering builds and validations before creating a PR. It integrates with tools like **CircleCI**, **GitHub Actions**, and **Jenkins** to ensure every change passes required checks.

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### What makes these tasks autonomous

Each task goes through Cosine’s full reasoning loop:

1. Context retrieval → 2. Plan generation → 3. Code writing and modification → 4. Validation and tests → 5. PR submission.

This means you can assign dozens of tasks simultaneously, and Cosine will progress on them in parallel — no need for supervision.

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### Real-world examples

* A large enterprise used Cosine to handle **backlog cleanup**, closing hundreds of minor issues in under an hour.
* Another team used Cosine for a **cloud migration project**, completing dependency upgrades and config changes in two weeks instead of a month.
* Cosine’s own engineering team has merged **1,700+ PRs since June**, including bug fixes, tests, and new features.

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### Related pages

* [How does Cosine work?](https://docs.cosine.sh/~/revisions/EEDgImat7fvMa1mEOxHy/faqs/getting-started/how-does-cosine-work)
* [What are Cosine’s core features?](https://docs.cosine.sh/~/revisions/EEDgImat7fvMa1mEOxHy/faqs/getting-started/what-are-cosines-core-features)

→ Next: [How does Cosine minimise hallucinations and ensure code quality?](https://docs.cosine.sh/~/revisions/EEDgImat7fvMa1mEOxHy/faqs/technology-and-quality/how-does-cosine-minimise-hallucinations-and-ensure-code-quality)