Hash a string with SHA-256, SHA-1, or MD5. Delx Agent Utilities are separate from the free witness protocol and may expose x402 utility pricing.
Part of the Delx MCP Server server.
Free to start. No card required.
AI agents call util_hash to retrieve information from Delx 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 util_hash 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": {
"util_hash": {}
}
}See the full Delx MCP Server policy for all 96 tools.
These attack patterns abuse exactly the kind of access util_hash 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.
Hash a string with SHA-256, SHA-1, or MD5. Delx Agent Utilities are separate from the free witness protocol and may expose x402 utility pricing.. It is categorised as a Read tool in the Delx MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Delx MCP Server MCP server in PolicyLayer and add a rule for util_hash: 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 Delx MCP Server. Nothing to install.
util_hash 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 util_hash 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 util_hash. 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.
util_hash is provided by the Delx MCP Server MCP server (delx/delx-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 96 Delx 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.