Compute the canonical SHA-256 content hash for JSON input.
Part of the Signet MCP Tools server.
Free to start. No card required.
AI agents use signet_content_hash to create or modify resources in Signet MCP Tools. Write operations carry medium risk because an autonomous agent could trigger bulk unintended modifications. Rate limits prevent a single agent session from making hundreds of changes in rapid succession. Argument validation ensures the agent passes expected values.
Without a policy, an AI agent could call signet_content_hash repeatedly, creating or modifying resources faster than any human could review. PolicyLayer's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Signet MCP Tools.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"signet_content_hash": {
"limits": [
{
"counter": "signet_content_hash_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Signet MCP Tools policy for all 4 tools.
These attack patterns abuse exactly the kind of access signet_content_hash gives an agent. Each links to the full case and the policy that stops it:
Other write tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Compute the canonical SHA-256 content hash for JSON input.. It is categorised as a Write tool in the Signet MCP Tools MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Signet MCP Tools MCP server in PolicyLayer and add a rule for signet_content_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 Signet MCP Tools. Nothing to install.
signet_content_hash is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the signet_content_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 signet_content_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.
signet_content_hash is provided by the Signet MCP Tools MCP server (@signet-auth/mcp-tools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Signet MCP Tools 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.