Mark a signup session blocked and record why the flow could not continue.
Accepts freeform code/query input (code)
Part of the KeyID MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents call block_registration_session to retrieve information from KeyID without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though block_registration_session only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
tools:
block_registration_session:
rules:
- action: allowSee the full KeyID policy for all 64 tools.
Agents calling read-class tools like block_registration_session have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Read risk category across the catalogue. The same policy patterns (rate-limit, allow) apply to each.
Mark a signup session blocked and record why the flow could not continue.. It is categorised as a Read tool in the KeyID MCP Server, which means it retrieves data without modifying state.
Add a rule in your Intercept YAML policy under the tools section for block_registration_session. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the KeyID MCP server.
block_registration_session is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the block_registration_session 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 block_registration_session. 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.
block_registration_session is provided by the KeyID MCP server (@keyid/agent-kit). 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