When an invitee has declined a gathering, suggests up to 5 alternative contacts the host could invite in their place. Sources from the host's contacts, prioritising (a) members of the same tribe(s) as the declined invitee, (b) contacts in the same city, and (c) contacts not already on the gatheri...
Risk signalsHandles credentials or secrets (api_key)
Part of the Lyra Mcp Server server.
Free to start. No card required.
AI agents call lyra_suggest_substitute to retrieve information from Lyra Mcp Server 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 lyra_suggest_substitute 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.
{
"version": "1",
"default": "deny",
"tools": {
"lyra_suggest_substitute": {}
}
}See the full Lyra Mcp Server policy for all 34 tools.
These attack patterns abuse exactly the kind of access lyra_suggest_substitute gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
When an invitee has declined a gathering, suggests up to 5 alternative contacts the host could invite in their place. Sources from the host's contacts, prioritising (a) members of the same tribe(s) as the declined invitee, (b) contacts in the same city, and (c) contacts not already on the gathering. Returns scored suggestions with one-line rationale strings. Requires API key authentication.. It is categorised as a Read tool in the Lyra Mcp Server MCP Server, which means it retrieves data without modifying state.
Register the Lyra Mcp Server MCP server in PolicyLayer and add a rule for lyra_suggest_substitute: 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 Lyra Mcp Server. Nothing to install.
lyra_suggest_substitute 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 lyra_suggest_substitute 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 lyra_suggest_substitute. 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.
lyra_suggest_substitute is provided by the Lyra Mcp Server MCP server (https://mcp.checklyra.com/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 34 Lyra Mcp Server 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.