← All articles

What developer agents are good at

The best developer use cases for Paperclip agents are tasks that are:

• Well-specified: The requirements are clear enough that an agent can know when it's done
• Testable: There's a way to verify the output is correct
• Bounded: The scope is limited enough to complete in one session

This rules out big architectural decisions and exploratory R&D. It includes a lot of everyday dev work.

A practical developer agent stack

You (developer, board)
├── Code Review Agent — reviews PRs before you see them
├── Test Writer Agent — writes unit and integration tests
├── Documentation Agent — keeps docs in sync with code
└── Dependency Update Agent — handles routine dependency bumps

Use case 1: Pre-PR code review

Create a "Code Review Agent" that:

1. Gets assigned a PR URL
2. Checks out the branch
3. Reviews for common issues: security, performance, code style, missing tests
4. Posts a structured review as a comment
5. Requests changes or approves (triggers your review)

Your review starts from a pre-analyzed PR, not a blank slate. You spend time on judgment calls, not catching obvious issues.

Instructions snippet:

# Code Review Agent

You review pull requests for code quality, security, and correctness.

For each PR:
1. Check out the branch
2. Read the PR description and understand the intent
3. Review changed files for:
   - Security issues (SQL injection, XSS, secrets in code, input validation)
   - Logic errors and edge cases
   - Missing error handling
   - Test coverage gaps
   - Performance concerns
4. Write a structured review: Approved / Changes Requested, with specific line-level comments
5. Never approve a PR that contains hardcoded secrets or obvious security issues

Use case 2: Test writing

A Test Writer Agent assigned to a task like "Write tests for the auth module":

1. Reads the code to understand what it does
2. Identifies test cases: happy path, error cases, edge cases
3. Writes tests using the project's testing framework
4. Runs the tests to verify they pass
5. Commits and pushes the test file

This is one of the highest-ROI developer agent workflows — test coverage improves, the agent does the tedious work of writing 20 similar test cases, and your time is freed for the hard cases.

Use case 3: Documentation maintenance

A Documentation Agent that:

• Watches for changes to exported functions/APIs
• Updates JSDoc comments and README sections
• Rewrites outdated examples
• Creates new docs for new features

Assign it on a weekly basis: "Review the docs and update anything that's stale based on recent commits."

Use case 4: Dependency updates

A Dependency Update Agent that:

1. Runs npm outdated or pip list --outdated
2. Checks the changelog for each outdated package
3. Creates a PR updating packages where the upgrade is non-breaking
4. Writes a summary of what changed and why it's safe to update
5. Requests your review before merge

Minor version updates with no breaking changes can often be handled autonomously. Major version upgrades get flagged for human review.

Use case 5: Side project development

For solo developers with side projects:

Weekend project: Build a small CLI tool for X
- You write the design spec
- Developer agent implements it
- You review each PR
- Agent addresses feedback
- Agent writes tests
- Agent writes README

Many developers report that agents help them complete side projects that would otherwise sit in their backlog indefinitely. Not because the agent does better work — because it removes the activation energy of starting each session.

Setting up a developer agent

Workspace: The developer agent needs access to your git repos. For claude_local, the agent runs on your machine or VPS with access to the file system.

Configure the agent's workspace to point to your project:

{
  "adapterConfig": {
    "instructionsFilePath": "/path/to/your/project/AGENTS.md"
  }
}

AGENTS.md for a developer agent:

# Developer Agent — [Project Name]

You write code, tests, and documentation for [project description].

## Working directory
All code work happens in `/path/to/project`.

## Workflow
For each task:
1. Read the task description carefully
2. Check existing code to understand context
3. Write the implementation
4. Write or update tests
5. Verify tests pass
6. Commit with a descriptive message
7. Update the task with what you did and what to review

## Code style
- TypeScript strict mode
- Jest for tests
- ESLint + Prettier formatting
- Descriptive variable names, minimal comments

What developer agents struggle with

Debugging production incidents: Too much context, too many variables. Human expertise is essential.

Architecture decisions: "Should we use microservices?" requires judgment about your organization, not just code.

UI/UX design work: Visual and interaction design is hard to specify and verify programmatically.

Novel algorithmic problems: Agents are good at applying known patterns; less good at inventing new solutions.

The rule: if you could write a detailed spec for it, an agent can probably do it. If you're still figuring out the spec, do it yourself.

Self-hosting for developer workloads

Developer agents use more compute than content agents — code execution, multiple file reads, git operations. A 2 GB RAM VPS is the minimum; 4 GB is better.

Hetzner CX22 (€4.51/month, 4 GB RAM) is the recommended choice. Railway gives you $20 free credit for a managed start.

This is an independent guide. Paperclip Hosting is not affiliated with the official Paperclip project. Guide steps are based on real deployments and are subject to change as the software evolves.