You need Node.js 22 or later, git, and bash. On Windows, run the installer from Git Bash. PowerShell breaks the script’s line endings.
nexus login
Sign in with your browser, or paste a Fireworks API key (fw_...).Already set up? Skip to step 2.
Quit Cursor IDE
Fully quit Cursor IDE before you connect or run off. A running Cursor IDE overwrites the change from memory. If it’s open, Nexus CLI waits until you quit. --force writes anyway, which isn’t recommended.
Connect Cursor IDE
nexus cursornexus cursor status
Nexus CLI registers the Fireworks catalog in the picker and points every mode you already have in modelConfig at the default model. It never adds modes.
Reopen and pick a model
Reopen Cursor IDE and choose a Fireworks model. The default is nexus/auto. To change the default for every mode, run nexus cursor --model glm-latest.
Cursor IDE after Nexus CLI, with Auto selected
nexus cursor status shows the provider, where the key comes from, and the configured model.
While connected, only Fireworks models work. Cursor IDE’s built-in models are hidden until you run off. Cursor IDE also enforces a server-side allowlist, so not every Fireworks model is selectable. Some features may still use Cursor’s own backend, depending on plan and version.
Nexus CLI registers Nexus Auto in Cursor IDE as nexus/auto, because Cursor reserves the bare auto name for its own router.
Anthropic and OpenAI model turns: connect a Provider Key. Cursor IDE can’t send extra headers, so Nexus CLI doesn’t send keys saved with nexus auto, and manual setup can’t add them either. Without a Provider Key, Nexus Auto serves every turn with open models.
Provider scope:nexus auto --providers has no effect in Cursor IDE.
Nexus CLI can connect Cursor IDE to Fireworks models deployed in your Azure subscription. See Nexus for Microsoft Foundry. Nexus Auto is not available on Foundry.
Model name is not valid: "auto", or the same error for another Fireworks ID: Cursor IDE stopped sending your Fireworks key. Cursor can turn the key off after Fireworks rejects a request, such as when the key is revoked or a model ID is not found. Without a key, Cursor treats Fireworks IDs as unknown models. Open Settings → Models, turn OpenAI API Key back on, and retry.
The key was revoked: turning it back on is not enough. Run nexus login --force for a new key, fully quit Cursor IDE, and run nexus cursor. With manual setup, paste a new key from Fireworks settings.
See Nexus Auto for issues that affect every harness.
Cursor IDE stores AI settings in SQLite, in User/globalStorage/state.vscdb under ~/.config/Cursor (Linux), ~/Library/Application Support/Cursor (macOS), or %APPDATA%\Cursor (Windows):
Setting
Value
secret://cursorAuth/openAIKey
Your Fireworks key, encrypted with Electron safeStorage
cursorAuth/openAIKey
The same key in plain text, for older Cursor builds
openAIBaseUrl
https://api.fireworks.ai/inference/v1
useOpenAIKey
true
aiSettings.userAddedModels
The Fireworks catalog, tracked for a clean off
aiSettings.modelOverrideDisabled
Cursor’s built-in models, hidden while connected
aiSettings.modelConfig[<mode>]
The Fireworks model for each mode
On Linux, encryption needs libsecret. Without it, Cursor IDE only obfuscates the key and Nexus CLI warns you.off restores your previous AI settings and key from the snapshot under ~/.nexus/cursor/. Without a snapshot, it removes only what Nexus CLI added. Use --db-path for a non-default state.vscdb.
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To change the default for every mode, run `,_jsx(_components.code,{children:`nexus cursor --model glm-latest`}),`.`]}),_jsx(Frame,{caption:`Cursor IDE after Nexus CLI, with Auto selected`,children:_jsx(OptimizedImage,{src:`https://mintcdn.com/fireworksai-docs/VYpNGusqwFX7L4nT/images/nexus/cursor-ide-model-picker.png?fit=max\u0026auto=format\u0026n=VYpNGusqwFX7L4nT\u0026q=85\u0026s=62e6c6629cbb1328ca0d515053c595d2`,alt:`Cursor IDE model picker showing Auto selected with Fireworks DeepSeek, GLM, Kimi, and MiniMax models`,\"data-og-width\":`2000`,width:`2000`,\"data-og-height\":`1104`,height:`1104`,\"data-path\":`images/nexus/cursor-ide-model-picker.png`,\"data-optimize\":`true`,\"data-opv\":`3`,srcset:`https://mintcdn.com/fireworksai-docs/VYpNGusqwFX7L4nT/images/nexus/cursor-ide-model-picker.png?w=280\u0026fit=max\u0026auto=format\u0026n=VYpNGusqwFX7L4nT\u0026q=85\u0026s=06ca1081c779603d05dff4fb0ad0b33d 280w, https://mintcdn.com/fireworksai-docs/VYpNGusqwFX7L4nT/images/nexus/cursor-ide-model-picker.png?w=560\u0026fit=max\u0026auto=format\u0026n=VYpNGusqwFX7L4nT\u0026q=85\u0026s=b06b7a2f368b0146f7c1998cd8fc744b 560w, https://mintcdn.com/fireworksai-docs/VYpNGusqwFX7L4nT/images/nexus/cursor-ide-model-picker.png?w=840\u0026fit=max\u0026auto=format\u0026n=VYpNGusqwFX7L4nT\u0026q=85\u0026s=d670afe047b5f285e400f2fb7bf25404 840w, https://mintcdn.com/fireworksai-docs/VYpNGusqwFX7L4nT/images/nexus/cursor-ide-model-picker.png?w=1100\u0026fit=max\u0026auto=format\u0026n=VYpNGusqwFX7L4nT\u0026q=85\u0026s=301985e52345fc370834f5ba6e8ce2f6 1100w, https://mintcdn.com/fireworksai-docs/VYpNGusqwFX7L4nT/images/nexus/cursor-ide-model-picker.png?w=1650\u0026fit=max\u0026auto=format\u0026n=VYpNGusqwFX7L4nT\u0026q=85\u0026s=dce4ce69a399f96ec2f89ee4c723d997 1650w, https://mintcdn.com/fireworksai-docs/VYpNGusqwFX7L4nT/images/nexus/cursor-ide-model-picker.png?w=2500\u0026fit=max\u0026auto=format\u0026n=VYpNGusqwFX7L4nT\u0026q=85\u0026s=10a20e461cb012f386bcb37b5becd594 2500w`})}),_jsxs(Check,{children:[_jsx(_components.code,{children:`nexus cursor status`}),` shows the provider, where the key comes from, and the configured model.`]})]})]}),`\n`,_jsx(Warning,{children:_jsxs(_components.p,{children:[_jsx(_components.strong,{children:`While connected, only Fireworks models work.`}),` Cursor IDE’s built-in models are hidden until you run `,_jsx(_components.code,{children:`off`}),`. Cursor IDE also enforces a server-side allowlist, so not every Fireworks model is selectable. Some features may still use Cursor’s own backend, depending on plan and version.`]})}),`\n`,_jsx(Heading,{level:`2`,id:`use-nexus-auto`,children:`Use Nexus Auto`}),`\n`,_jsxs(_components.p,{children:[`Nexus CLI registers Nexus Auto in Cursor IDE as `,_jsx(_components.code,{children:`nexus/auto`}),`, because Cursor reserves the bare `,_jsx(_components.code,{children:`auto`}),` name for its own router.`]}),`\n`,_jsxs(_components.ul,{children:[`\n`,_jsxs(_components.li,{children:[_jsx(_components.strong,{children:`Anthropic and OpenAI model turns:`}),` connect a `,_jsx(_components.a,{href:`/nexus/provider-keys`,children:`Provider Key`}),`. Cursor IDE can’t send extra headers, so Nexus CLI doesn’t send keys saved with `,_jsx(_components.code,{children:`nexus auto`}),`, and manual setup can’t add them either. Without a Provider Key, Nexus Auto serves every turn with open models.`]}),`\n`,_jsxs(_components.li,{children:[_jsx(_components.strong,{children:`Provider scope:`}),` `,_jsx(_components.code,{children:`nexus auto --providers`}),` has no effect in Cursor IDE.`]}),`\n`]}),`\n`,_jsx(Heading,{level:`2`,id:`mcp-and-tools`,children:`MCP and tools`}),`\n`,_jsx(_components.p,{children:`Nexus CLI doesn’t touch MCP. Set up servers in Cursor IDE as usual.`}),`\n`,_jsxs(_components.p,{children:[`Nexus CLI does not add web search to Cursor IDE. See `,_jsx(_components.a,{href:`/nexus/web-search`,children:`Web Search`}),`.`]}),`\n`,_jsx(Heading,{level:`2`,id:`microsoft-foundry`,children:`Microsoft Foundry`}),`\n`,_jsxs(_components.p,{children:[`Nexus CLI can connect Cursor IDE to Fireworks models deployed in your Azure subscription. See `,_jsx(_components.a,{href:`/nexus/microsoft-foundry`,children:`Nexus for Microsoft Foundry`}),`. Nexus Auto is not available on Foundry.`]}),`\n`,_jsx(Heading,{level:`2`,id:`troubleshooting`,children:`Troubleshooting`}),`\n`,_jsxs(_components.ul,{children:[`\n`,_jsxs(_components.li,{children:[_jsxs(_components.strong,{children:[_jsx(_components.code,{children:`Model name is not valid: \"auto\"`}),`, or the same error for another Fireworks ID:`]}),` Cursor IDE stopped sending your Fireworks key. Cursor can turn the key off after Fireworks rejects a request, such as when the key is revoked or a model ID is not found. Without a key, Cursor treats Fireworks IDs as unknown models. Open `,_jsx(_components.strong,{children:`Settings → Models`}),`, turn `,_jsx(_components.strong,{children:`OpenAI API Key`}),` back on, and retry.`]}),`\n`,_jsxs(_components.li,{children:[_jsx(_components.strong,{children:`The key was revoked:`}),` turning it back on is not enough. Run `,_jsx(_components.code,{children:`nexus login --force`}),` for a new key, fully quit Cursor IDE, and run `,_jsx(_components.code,{children:`nexus cursor`}),`. With manual setup, paste a new key from `,_jsx(_components.a,{href:`https://app.fireworks.ai/settings/users/api-keys`,children:`Fireworks settings`}),`.`]}),`\n`]}),`\n`,_jsxs(_components.p,{children:[`See `,_jsx(_components.a,{href:`/nexus/auto#troubleshooting`,children:`Nexus Auto`}),` for issues that affect every harness.`]}),`\n`,_jsx(Heading,{level:`2`,id:`manual-setup-advanced`,children:`Manual setup (advanced)`}),`\n`,_jsxs(Steps,{children:[_jsx(Step,{title:`Open model settings`,icon:`gear`,children:_jsxs(_components.p,{children:[`In Cursor IDE, open `,_jsx(_components.strong,{children:`Settings`}),`, then `,_jsx(_components.strong,{children:`Models`}),`.`]})}),_jsx(Step,{title:`Add your Fireworks key`,icon:`key`,children:_jsxs(_components.p,{children:[`Under `,_jsx(_components.strong,{children:`API Keys`}),`, paste your Fireworks key into `,_jsx(_components.strong,{children:`OpenAI API Key`}),`. Turn on `,_jsx(_components.strong,{children:`Override OpenAI Base URL`}),` and enter `,_jsx(_components.code,{children:`https://api.fireworks.ai/inference/v1`}),`.`]})}),_jsx(Step,{title:`Add a model`,icon:`plus`,children:_jsxs(_components.p,{children:[`Add a custom model with a Fireworks ID, such as `,_jsx(_components.code,{children:`glm-latest`}),`, then select it in chat.`]})})]}),`\n`,_jsxs(_components.p,{children:[`See `,_jsx(_components.a,{href:`/nexus/manual-setup#what-changes-without-the-nexus-cli`,children:`what changes without the Nexus CLI`}),`.`]}),`\n`,_jsx(Heading,{level:`2`,id:`what-the-nexus-cli-writes`,children:`What the Nexus CLI writes`}),`\n`,_jsxs(Accordion,{title:`See what Nexus CLI writes`,id:`see-what-nexus-cli-writes`,children:[_jsxs(_components.p,{children:[`Cursor IDE stores AI settings in SQLite, in `,_jsx(_components.code,{children:`User/globalStorage/state.vscdb`}),` under `,_jsx(_components.code,{children:`~/.config/Cursor`}),` (Linux), `,_jsx(_components.code,{children:`~/Library/Application Support/Cursor`}),` (macOS), or `,_jsx(_components.code,{children:`%APPDATA%\\\\Cursor`}),` (Windows):`]}),_jsxs(Table,{children:[_jsx(_components.thead,{children:_jsxs(_components.tr,{children:[_jsx(_components.th,{children:`Setting`}),_jsx(_components.th,{children:`Value`})]})}),_jsxs(_components.tbody,{children:[_jsxs(_components.tr,{children:[_jsx(_components.td,{children:_jsx(_components.code,{children:`secret://cursorAuth/openAIKey`})}),_jsxs(_components.td,{children:[`Your Fireworks key, encrypted with Electron `,_jsx(_components.code,{children:`safeStorage`})]})]}),_jsxs(_components.tr,{children:[_jsx(_components.td,{children:_jsx(_components.code,{children:`cursorAuth/openAIKey`})}),_jsx(_components.td,{children:`The same key in plain text, for older Cursor builds`})]}),_jsxs(_components.tr,{children:[_jsx(_components.td,{children:_jsx(_components.code,{children:`openAIBaseUrl`})}),_jsx(_components.td,{children:_jsx(_components.code,{children:`https://api.fireworks.ai/inference/v1`})})]}),_jsxs(_components.tr,{children:[_jsx(_components.td,{children:_jsx(_components.code,{children:`useOpenAIKey`})}),_jsx(_components.td,{children:_jsx(_components.code,{children:`true`})})]}),_jsxs(_components.tr,{children:[_jsx(_components.td,{children:_jsx(_components.code,{children:`aiSettings.userAddedModels`})}),_jsxs(_components.td,{children:[`The Fireworks catalog, tracked for a clean `,_jsx(_components.code,{children:`off`})]})]}),_jsxs(_components.tr,{children:[_jsx(_components.td,{children:_jsx(_components.code,{children:`aiSettings.modelOverrideDisabled`})}),_jsx(_components.td,{children:`Cursor’s built-in models, hidden while connected`})]}),_jsxs(_components.tr,{children:[_jsx(_components.td,{children:_jsx(_components.code,{children:`aiSettings.modelConfig[\u003cmode>]`})}),_jsx(_components.td,{children:`The Fireworks model for each mode`})]})]})]}),_jsxs(_components.p,{children:[`On Linux, encryption needs `,_jsx(_components.code,{children:`libsecret`}),`. Without it, Cursor IDE only obfuscates the key and Nexus CLI warns you.`]}),_jsxs(_components.p,{children:[_jsx(_components.code,{children:`off`}),` restores your previous AI settings and key from the snapshot under `,_jsx(_components.code,{children:`~/.nexus/cursor/`}),`. Without a snapshot, it removes only what Nexus CLI added. 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