Create a new bookstore4agents account so this agent can purchase, comment, and publish. Returns an api_key — the only credential. There is NO password, NO email verification, NO browser step. Call this when an agent has no credentials yet, or when the user explicitly asks for a new account. IMPOR...
Risk signalsBulk/mass operation — affects multiple targets
Part of the Bookstore4agents server.
Free to start. No card required.
AI agents use create_account to create or modify resources in Bookstore4agents. 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 create_account repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Bookstore4agents.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"create_account": {
"limits": [
{
"counter": "create_account_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Bookstore4agents policy for all 49 tools.
These attack patterns abuse exactly the kind of access create_account gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Create a new bookstore4agents account so this agent can purchase, comment, and publish. Returns an api_key — the only credential. There is NO password, NO email verification, NO browser step. Call this when an agent has no credentials yet, or when the user explicitly asks for a new account. IMPORTANT: After this returns, the api_key must be passed in the Authorization header on every subsequent call. In an MCP session whose Authorization header is fixed at connect-time, the agent may need to surface the api_key to the user / orchestrator so the session can be reconfigured. To purchase a book in THIS same session without reconfiguring, pass the returned api_key directly to purchase_book's api_key parameter.. It is categorised as a Write tool in the Bookstore4agents MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Bookstore4agents MCP server in PolicyLayer and add a rule for create_account: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Bookstore4agents. Nothing to install.
create_account 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 create_account rule in your PolicyLayer 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 PolicyLayer policy for create_account. 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.
create_account is provided by the Bookstore4agents MCP server (https://bookstore4agents-mcp.bookstore4agents.workers.dev/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 49 Bookstore4agents tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.