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fix(mcp): fail clearly when OAuth callback port is in use #31490

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fix(mcp): fail clearly when OAuth callback port is in use #31490

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8 changes: 7 additions & 1 deletion packages/opencode/src/mcp/oauth-callback.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -144,7 +144,13 @@ export async function ensureRunning(redirectUri?: string): Promise<void> {

const running = await isPortInUse(port)
if (running) {
return
// Cannot reuse: the other listener may not be opencode, and OAuth
// callbacks landing there surface as a misleading CSRF error.
throw new Error(
`OAuth callback port ${port} is already in use. ` +
`Set "oauth.callbackPort" (or "oauth.redirectUri") on the MCP server ` +
`entry in your opencode config to use a different port.`,
)
}

currentPort = port
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