Create a new Unphurl account. Returns an API key (shown once, store it securely). After signup, the user must check their email and click the verification link. The API key won't work for URL checks until the email is verified. Verification link expires after 24 hours. If the link expires, use t...
Part of the Unphurl MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents use signup to create or modify resources in Unphurl. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call signup repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Unphurl.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
tools:
signup:
rules:
- action: allow
rate_limit:
max: 30
window: 60See the full Unphurl policy for all 13 tools.
Agents calling write-class tools like signup have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.
Create a new Unphurl account. Returns an API key (shown once, store it securely). After signup, the user must check their email and click the verification link. The API key won't work for URL checks until the email is verified. Verification link expires after 24 hours. If the link expires, use the "resend_verification" tool to request a new one. The account starts with 20 free pipeline check credits so the user can test with real URLs. Known domain lookups (google.com, github.com, etc.) and cached domain lookups are always free. To check more unknown domains through the full analysis pipeline, the user can purchase credits via the "purchase" tool. Once the user has their API key, they need to add it to their MCP server configuration as UNPHURL_API_KEY. This tool does not require an API key.. It is categorised as a Write tool in the Unphurl MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Add a rule in your Intercept YAML policy under the tools section for signup. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Unphurl MCP server.
signup is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the signup rule in your Intercept policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the Intercept policy for signup. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
signup is provided by the Unphurl MCP server (@unphurl/mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept