# startSignup

Begin an agent-driven sign-up to Stable Baseline. Anonymous-callable. Returns a verification_url and a 6-character user_code that the agent must show to the user. The user opens the URL in their browser, signs in or signs up if necessary, enters the code, and clicks Authorize. The agent meanwhile polls pollSignupStatus({device_code}) every poll_interval_seconds until the status changes to authorized, at which point it receives an api_key it can use for subsequent MCP calls. The whole flow has a 10-minute TTL.

Agent View of the PolicyLayer registry record for `startSignup`. HTML page: https://policylayer.com/tools/io-stablebaseline-sb/startsignup

## Facts

- Tool: `startSignup`
- Server: Stable Baseline (`https://api.stablebaseline.io/functions/v1/cloud-serve/mcp`) — https://policylayer.com/tools/io-stablebaseline-sb.md
- Homepage: https://github.com/stablebaseline/mcp
- Risk category: Other (Low risk)
- Registry record: grade F, identity unverified
- Server auth posture: open
- Server CORS policy: https://app.stablebaseline.io
- Server rate-limited: no
- Parameters: 3
- Recommended policy verdict: Rate-limited

## Parameters

| Parameter | Type | Required | Description |
| --- | --- | --- | --- |
| `intent` | string | no | Reason for the signup. Currently only 'mcp_setup' is supported. |
| `agent_label` | string | no | Self-identification of the calling agent (e.g. 'Claude Desktop', 'Cursor', 'Custom CLI'). Shown to the user on the confirmation page so they know what they're a |
| `desired_org_name` | string | no | Optional hint for the org name to suggest if the user has no organisation yet. Ignored for users who already have an org. |

Parameters from the server's own tool schema.

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "startSignup",
    "arguments": {}
  }
}
```

## Why startSignup is rated Low

This tool initiates an OAuth-style device authorization flow for user sign-up/login. It doesn't read user data, write application data, execute code, destroy anything, or move money — it purely starts an authentication handshake and returns a URL and code for the user to authorize. The closest category is Other, as it's an identity/auth initiation step.

From the tool's own definition: "Begin an agent-driven sign-up to Stable Baseline. Anonymous-callable. Returns a `verification_url` and a 6-character `user_code` that the agent must show to the user."

## Use case

AI agents call startSignup as a supporting operation in Stable Baseline workflows.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Stable Baseline:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "startSignup": {
      "limits": [
        {
          "counter": "startsignup_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Stable Baseline (195)

- `cancelAllKgInScope` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/cancelallkginscope.md
- `cancelKgBuildBatch` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/cancelkgbuildbatch.md
- `deleteDiagramInDocument` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deletediagramindocument.md
- `deleteDocument` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deletedocument.md
- `deleteFolder` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deletefolder.md
- `deleteImageInDocument` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deleteimageindocument.md
- `deleteImprovement` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deleteimprovement.md
- `deleteImprovementCategory` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deleteimprovementcategory.md
- `deleteImprovementComment` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deleteimprovementcomment.md
- `deletePlan` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deleteplan.md
- `deletePlanComment` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deleteplancomment.md
- `deletePlanPhase` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deleteplanphase.md
- `deleteResourcePermission` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deleteresourcepermission.md
- `deleteTaskDependency` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deletetaskdependency.md
- `deleteTeam` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deleteteam.md
- `deleteVegaDataFile` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deletevegadatafile.md
- `deleteWhiteboard` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/deletewhiteboard.md
- `removeMember` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/removemember.md
- `removeTeamMember` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/removeteammember.md
- `removeWorkspaceMember` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/removeworkspacemember.md
- `resetDocumentInBrain` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/resetdocumentinbrain.md
- `revokeTeamWorkspaceAccess` — Destructive — https://policylayer.com/tools/io-stablebaseline-sb/revoketeamworkspaceaccess.md
- `autoDesignWhiteboard` — Execute — https://policylayer.com/tools/io-stablebaseline-sb/autodesignwhiteboard.md
- `renderDiagram` — Execute — https://policylayer.com/tools/io-stablebaseline-sb/renderdiagram.md
- `startMeetingScribe` — Execute — https://policylayer.com/tools/io-stablebaseline-sb/startmeetingscribe.md
- `stopMeetingScribe` — Execute — https://policylayer.com/tools/io-stablebaseline-sb/stopmeetingscribe.md
- `triggerKgRebuild` — Execute — https://policylayer.com/tools/io-stablebaseline-sb/triggerkgrebuild.md
- `applySubscriptionChange` — Financial — https://policylayer.com/tools/io-stablebaseline-sb/applysubscriptionchange.md
- `cancelSubscription` — Financial — https://policylayer.com/tools/io-stablebaseline-sb/cancelsubscription.md
- `getCustomerPortalLink` — Financial — https://policylayer.com/tools/io-stablebaseline-sb/getcustomerportallink.md
- …and 165 more: https://policylayer.com/tools/io-stablebaseline-sb.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=io-stablebaseline-sb · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/io-stablebaseline-sb