Create a tamper-evident PetriNetSeal for a Petri net model. Computes a canonical SHA-256 hash and optionally verifies declared invariants via reachability analysis. Returns a JSON-LD seal document.
Part of the Pflow server.
Free to start. No card required.
AI agents use petri_seal to create or modify resources in Pflow. 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 petri_seal 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 Pflow.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"petri_seal": {
"limits": [
{
"counter": "petri_seal_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Pflow policy for all 22 tools.
These attack patterns abuse exactly the kind of access petri_seal 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.
Create a tamper-evident PetriNetSeal for a Petri net model. Computes a canonical SHA-256 hash and optionally verifies declared invariants via reachability analysis. Returns a JSON-LD seal document.. It is categorised as a Write tool in the Pflow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Pflow MCP server in PolicyLayer and add a rule for petri_seal: 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 Pflow. Nothing to install.
petri_seal 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 petri_seal 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 petri_seal. 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.
petri_seal is provided by the Pflow MCP server (stackdump/pflow-pilot). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 22 Pflow 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.