Fill a legal agreement template with field values and return a document via URL or MCP resource preview metadata. For recipe templates (e.g. NVCA), also generates a redline (track-changes) document comparing the filled output against the standard form.
Risk signalsAccepts raw HTML/template content (template)
Part of the Open Agreements server.
Free to start. No card required.
AI agents use fill_template to create or modify resources in Open Agreements. 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 fill_template 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 Open Agreements.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
{
"version": "1",
"default": "deny",
"tools": {
"fill_template": {
"limits": [
{
"counter": "fill_template_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}See the full Open Agreements policy for all 6 tools.
These attack patterns abuse exactly the kind of access fill_template 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.
Fill a legal agreement template with field values and return a document via URL or MCP resource preview metadata. For recipe templates (e.g. NVCA), also generates a redline (track-changes) document comparing the filled output against the standard form.. It is categorised as a Write tool in the Open Agreements MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Open Agreements MCP server in PolicyLayer and add a rule for fill_template: 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 Open Agreements. Nothing to install.
fill_template 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 fill_template 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 fill_template. 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.
fill_template is provided by the Open Agreements MCP server (@open-agreements/contract-templates-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 Open Agreements tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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