AgentAPIvsArbor
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
AgentAPI
Coder · Agent harness
OSS
Panel
7.32 spec wins
- Reliability
- 7.2
- Usefulness
- 6.7
- Cost
- 8.5
- Longevity
- 6.8
“Its web platform is a chat page served to your own laptop on port 3284, which makes it the most honest cloud on this board.”
Arbor
penso · Agent harness
OSSMCP
Panel
7.26 spec wins
- Reliability
- 7.0
- Usefulness
- 7.0
- Cost
- 8.7
- Longevity
- 6.0
“It manages your repositories, your worktrees, your terminals and your processes, so the only unmanaged thing left in the room is you.”
Spec by spec
| Spec | AgentAPI | Arbor |
|---|---|---|
| Architecture | ||
| Category | Agent harness | Agent harness |
| Runs | local | local |
| Platforms | macos, linux, windows, web | macos, linux, windows, web |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | No | Yes |
| MCP server | No | Yes |
| Capabilities | ||
| Runs terminal commands | Yes | Yes |
| Multi-file edits | NoEditing is done by the wrapped agent; AgentAPI only relays messages to and from it. | Yes |
| Git operations | No | Yes |
| Browser control | No | No |
| Sandboxed execution | No | No |
| Multi-agent orchestration | No | Yes |
| Headless / CI mode | Yes | No |
| Models | ||
| Backbone | via wrapped agents (Claude Code, Goose, Aider, Gemini CLI, Amp, Codex) | Claude Code, Codex, OpenCode |
| Bring your own model | Yes | Yes |
| Local models | No | YesOllama appears among the providers Arbor can be pointed at. |
| Cost | ||
| Pricing model | free | byok |
| Starts at | $0/mo | $0/mo |
| Free tier | Yes | Yes |
| Bring your own key | Yes | Yes |
| Openness | ||
| Open source | Yes | Yes |
| License | MIT | MIT |
| GitHub stars | 1,500 | 831 |
Which one would each critic pick
| Critic | AgentAPI | Arbor | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 7.5 | 7.5 | no preference |
| El Crítico | 6.5 | 6.8 | Arbor — The desktop app, the web interface and the command line all read one daemon, and nothing documents what an in-flight session does when it dies. |
| El Profesor | 7.0 | 7.5 | Arbor — The unit of work is an issue and the working tree is created for it, so the boundary of the task and the boundary of the checkout are the same boundary. |
| La Inversora | 7.3 | 6.8 | AgentAPI — Coder gives this away because an agent that speaks HTTP belongs in a remote development environment, and that is the product with the price on it. |
| La Jefa | 7.0 | 6.3 | AgentAPI — Zero licence cost and the rare tool here that fits automation without argument, but the row carries no SSO, no SCIM and no audit log. |
| El Hacker | 8.5 | 8.3 | AgentAPI — MIT, one downloaded binary, `agentapi server -- claude`, and their answer on MCP is a README section showing you how to build that server yourself. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.