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PatternsAgent Patterns
Eve Simple Tool Agent
Eve Simple Tool Agent
Build and verify a filesystem-first Eve agent with a typed weather tool and deterministic eval suite. Runs without provider credentials.
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Problems solved
Technical challenges this implementation handles out of the box.
- Scaffold a durable Eve agent from a complete filesystem artifact
- Define a typed tool with validated input and output
- Verify agent discovery, tool calls, output, and replies before shipping
- Run the full test loop without API keys or provider credentials
Use cases
Products and workflows this pattern is designed to support.
- Learning Eve project conventions
- Starting a tool-using backend agent
- Building deterministic smoke tests for an agent
- Validating an Eve Pattern before publishing it
Setup
Requirements, wiring steps, and what this pattern adds to your project.
Getting started
Pick how you want to pull this pattern in. Then wire env vars and routes the same way.
- 1
Install into an empty project directory
Copy the tokenized install command from the preview toolbar and run it in an empty directory so the Eve package and agent tree stay together.
- 2
Install dependencies and run the verification suite
With Node.js 24+, run `pnpm install`, `pnpm verify:discovery`, `pnpm typecheck`, `pnpm build`, and `pnpm eval`.
- 3
Run the Eve development server
Run `pnpm dev` after every verification gate passes.
Files added
10 filespackage.jsontsconfig.jsonREADME.md.gitignore.node-versionagent/agent.tsagent/instructions.mdagent/tools/get_weather.tsevals/evals.config.tsevals/weather.eval.ts
Dependencies
3 totalnpm packages
3AISDKeveZod
Requirements
- Complexity
- Beginner
- Setup time
- ~5 minutes
- Node
- 24+
- Memory
- 256MB
