Verify that a mobile/CTV app bundle ID actually exists in its app store and, optionally, that the listed developer matches. Detects bundle-ID spoofing in bid requests. Use this tool when: - A bid request names an app bundle and you must confirm the app is real. Inputs: - bundle_id (required), pla...
Part of the Sigil server.
Free to start. No card required.
AI agents call sigil_verify_app_bundle to retrieve information from Sigil 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 sigil_verify_app_bundle 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": {
"sigil_verify_app_bundle": {}
}
}See the full Sigil policy for all 12 tools.
These attack patterns abuse exactly the kind of access sigil_verify_app_bundle 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.
Verify that a mobile/CTV app bundle ID actually exists in its app store and, optionally, that the listed developer matches. Detects bundle-ID spoofing in bid requests. Use this tool when: - A bid request names an app bundle and you must confirm the app is real. Inputs: - bundle_id (required), platform (required: ios | android | ctv_* | web), - claimed_developer (optional): developer name to match against the listing. Returns: verified (true/false/null), the store listing, and developer_match.. It is categorised as a Read tool in the Sigil MCP Server, which means it retrieves data without modifying state.
Register the Sigil MCP server in PolicyLayer and add a rule for sigil_verify_app_bundle: 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 Sigil. Nothing to install.
sigil_verify_app_bundle 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 sigil_verify_app_bundle 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 sigil_verify_app_bundle. 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.
sigil_verify_app_bundle is provided by the Sigil MCP server (https://mcp.sigil.tunnelmind.ai/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 12 Sigil tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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