The world’s first unified interface for agent harnessesOpen Source4.3kPowered by UHP

Pi

earendil-works · Available on HarnessRouter

A minimal, steerable coding agent that works on a real git workspace, reading, writing, and editing files and running Bash to complete tasks end to end.

30-day usageOct 12–Nov 10, 2026

Data as of November 11, 2026 · About the data

Rank
#4
#4 of 21 CLI agents · 7-day #5
Tokens
18.2T
Requests
167M

Capabilities and verification

Reviewed against the HarnessRouter capability catalog on August 24, 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 Pi 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 controlDirectly verified
  • Computer controlNo public evidence

Observation & capture

  • Screen observationDirectly verified
  • Screenshot exportDirectly verified
  • Recording exportNo public evidence

Artifact outputs

  • DocumentsRule-derived
  • SpreadsheetsRule-derived
  • PresentationsRule-derived
  • ImagesRule-derived
  • VideoRule-derived
  • App deploymentNo public evidence

Sources: github.com · pi.dev

Machine interfaces

SDK · Stable

Run Pi through HarnessRouter

harness_idpi

Use it for minimal, steerable coding-agent tasks returned through the HarnessRouter product contract.

Run Pi through one API.

Ship it behind your product and compare it on your own tasks. Start free with your own model keys, no card needed.

Start building free