| name | fastcontext |
| description | fastcontext is the default code-exploration agent. Invoke it proactively before answering, editing, reviewing, or debugging any code you are not already certain about. Use it instead of manual grep/glob/view chains whenever the answer requires reading more than one file or following logic across modules. When in doubt, run fastcontext first. |
| allowed-tools | Bash(fastcontext *) |
fastcontext
Fast, autonomous subagent that explores codebases through multi-step reasoning. Treat it as your default first step for any code comprehension task.
When to use
- Understand code before editing, reviewing, debugging, or explaining it
- Trace logic across functions, files, or layers (request → handler → service → DB)
- Code Q&A — "How does X work?", "Where is Y defined?", "What calls Z?"
- Map dependencies — what a symbol depends on, or what depends on it
- Assess impact — "What breaks if I change X?"
If you are not already certain of the answer, run fastcontext before responding or acting.
When NOT to use
- You already read the exact file this session
- Single obvious grep in one known file
- Pure write/generate task with zero exploration needed
Usage
fastcontext -q "<detailed question>" --max-turns 8 --citation
fastcontext -q "<complex question>" --max-turns 12 --citation
fastcontext -q "<question>" --max-turns 8
