Use this tool when the organizer needs to withdraw an entire proposal — cancelling it for all participants so no booking can result. Only proposals with status "pending" can be cancelled. Important: this is not the tool to use when a single participant wants to decline. If one participant wants t...
Part of the Meetsync MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents may call cancelProposal to permanently remove or destroy resources in Meetsync. Without a policy, an autonomous agent could delete critical data in a loop with no way to undo the damage. Intercept blocks destructive tools by default and requires explicit human approval before enabling them.
Without a policy, an AI agent could call cancelProposal in a loop, permanently destroying resources in Meetsync. There is no undo for destructive operations. Intercept blocks this tool by default and only allows it when a human explicitly approves the action.
Destructive tools permanently remove data. Block by default. Only enable with explicit approval workflows.
tools:
cancelProposal:
rules:
- action: deny
reason: "Blocked by default — enable with approval"See the full Meetsync policy for all 19 tools.
Agents calling destructive-class tools like cancelProposal have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Destructive risk category across the catalogue. The same policy patterns (deny, require_approval) apply to each.
cancelProposal is one of the critical-risk operations in Meetsync. For the full severity-focused view — only the critical-risk tools with their recommended policies — see the breakdown for this server, or browse all critical-risk tools across every MCP server.
Use this tool when the organizer needs to withdraw an entire proposal — cancelling it for all participants so no booking can result. Only proposals with status "pending" can be cancelled. Important: this is not the tool to use when a single participant wants to decline. If one participant wants to say no while others continue, call respondToProposal with status="rejected" for that participant instead.. It is categorised as a Destructive tool in the Meetsync MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.
Add a rule in your Intercept YAML policy under the tools section for cancelProposal. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Meetsync MCP server.
cancelProposal is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.
Yes. Add a rate_limit block to the cancelProposal 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 cancelProposal. 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.
cancelProposal is provided by the Meetsync MCP server (nicholasemccormick/meetsync-mcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic policy on every MCP tool call. Per-identity grants. Full audit log.