Cursor Composer 2.5 API for Local AI Harnesses

Put Composer behind every coding agent.

An unofficial CLI that exposes Cursor Composer 2.5 through one local OpenAI-compatible API.

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>_PowerShell
PowerShell 7.6.3
PS C:\Users\user>
PS C:\Users\user>irm https://cursor-api-windows.mynameistito.com/install.ps1 | iex
PS C:\Users\user>cursor-api key set
PS C:\Users\user>cursor-api start
PS C:\Users\user>cursor-api health
PS C:\Users\user>cursor-api url
composer-2.5

For deeper agent runs where quality matters more than response speed.

composer-2.5-fast

For tight edit loops, quick planning passes, and interactive agent sessions.

Base URL: http://127.0.0.1:6903/v1 · API key: cursor-local

Allowed where agents can point at a local API.

Each supported client can point at the same local OpenAI-compatible endpoint.

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OpenCode

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Codex

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Pi

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Kilo Code

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Aider

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VS Code

One endpoint
Keep each agent pointed at the same localhost URL instead of hand-editing every client when ports or models change.
Composer models
Expose composer-2.5 and composer-2.5-fast through OpenAI-compatible and Anthropic-compatible request shapes.
Windows daemon
Run the bridge in the background with daemon controls, health checks, logs, and update commands.
Bundled bridge
Ship cursor-api.exe beside the bundled Node bridge needed for local Cursor SDK calls.

Drop it into the tools you already use.

Configure your agent client with a local base URL, the literal key, and either Composer model name.

Open setup guide

Windows-native control plane.

Settings live in AppData, the API key is encrypted, and updates preserve local configuration.

API key

cursor-local

Base URL

http://127.0.0.1:6903/v1

Models

composer-2.5 / composer-2.5-fast

Encrypted key

%APPDATA%\cursor-api\api-key.enc

Daemon state

%APPDATA%\cursor-api\run\

Logs

%APPDATA%\cursor-api\logs\