Quick file integrity check: pass the SHA-256 hash of a capability file and its capability_id to verify the file matches what Fidensa certified. This is the simplest verification path — no .cert.json needed. No API key required.
Part of the Fidensa server.
Free to start. No card required.
AI agents call verify_file to retrieve information from Fidensa 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 verify_file 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": {
"verify_file": {}
}
}See the full Fidensa policy for all 7 tools.
These attack patterns abuse exactly the kind of access verify_file 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.
Quick file integrity check: pass the SHA-256 hash of a capability file and its capability_id to verify the file matches what Fidensa certified. This is the simplest verification path — no .cert.json needed. No API key required.. It is categorised as a Read tool in the Fidensa MCP Server, which means it retrieves data without modifying state.
Register the Fidensa MCP server in PolicyLayer and add a rule for verify_file: 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 Fidensa. Nothing to install.
verify_file 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 verify_file 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 verify_file. 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.
verify_file is provided by the Fidensa MCP server (@fidensa/mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 7 Fidensa 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.