Frida Agent Builder

Frida Agent Builder

Use this skill for reusable Frida agents and multi-script projects.

Project Shape

Prefer a small TypeScript agent when scripts will grow beyond a single hook:

agent/
├── package.json
├── tsconfig.json
├── src/
│   ├── index.ts
│   ├── log.ts
│   └── hooks/
└── dist/

For Frida 17 and Java APIs in bundled agents, include frida-java-bridge when required by the build/runtime style.

Build Rules

• Keep one hook family per file.
• Export an init() function per hook family and call it from src/index.ts.
• Use structured logging with tags and JSON for complex values.
• Add rpc.exports only for host-controlled actions or test probes.
• Avoid global broad hooks unless the task explicitly requires discovery.
• Keep generated artifacts out of source control unless the repository convention includes them.

Scaffold Script

Use scripts/scaffold-frida-agent.py to create a minimal TypeScript Frida agent:

python3 /path/to/frida-agent-builder/scripts/scaffold-frida-agent.py ./agent --java

Then install and build:

npm install
npm run build

References

Read references/agent-patterns.md for project conventions, RPC patterns, host command examples, and packaging notes.