fast-agent
A CLI-first agent harness and Python framework to code, build and evaluate agents, with broad model provider support, shell and file tools, Agent Skills, and MCP, ACP and A2A support.
30-day usageSep 26–Oct 25, 2026
Data as of October 26, 2026 · About the data
No attributed usage rank in the 30-day window ending October 25, 2026.
Capabilities and verification
Reviewed against the HarnessRouter capability catalog on October 26, 2026. Every verified row cites its public source; rule-derived rows apply HarnessRouter's published classification rules to documented behavior. A “No public evidence” badge marks a gap in the public record, not a statement that fast-agent lacks them.
Configuration & support
- Other modelsDirectly verified
- Custom instructionsDirectly verified
- SkillsDirectly verified
- Custom toolsDirectly verified
- MCPDirectly verified
- Sandbox & approvalsDirectly verified
- SessionsDirectly verified
- SubagentsDirectly verified
Execution & agency
- Workspace filesDirectly verified
- Structured actionsDirectly verified
Environment control
- Browser controlNo public evidence
- Computer controlNo public evidence
Observation & capture
- Screen observationNo public evidence
- Screenshot exportNo public evidence
- Recording exportNo public evidence
Artifact outputs
- DocumentsRule-derived
- SpreadsheetsRule-derived
- PresentationsRule-derived
- ImagesRule-derived
- VideoRule-derived
- App deploymentNo public evidence
Sources: fast-agent.ai
Machine interfaces
- Headless CLI · Stable
- ACP server · Stable
- SDK · Stable
- MCP server · Stable
- API · Stable
Run fast-agent through HarnessRouter
API harness ID: fast-agent
Use it for coding-agent tasks returned through the HarnessRouter product contract.
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