This tool fills form fields in a PDF document. It can set text values for form fields, check/uncheck checkboxes, and select radio buttons. Inputs: - inputFilePath: Path to the input PDF file or file:// URL - outputFilePath: Path where the filled PDF will be saved - formFields: Object...
Part of the Pdf Tools MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents use fill_pdf_form to create or modify resources in Pdf 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 fill_pdf_form repeatedly, creating or modifying resources faster than any human could review. Intercept's rate limiting ensures write operations happen at a controlled pace, and argument validation catches malformed or unexpected inputs before they reach Pdf Tools.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
tools:
fill_pdf_form:
rules:
- action: allow
rate_limit:
max: 30
window: 60See the full Pdf Tools policy for all 3 tools.
Agents calling write-class tools like fill_pdf_form have been implicated in these attack patterns. Read the full case and prevention policy for each:
Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.
This tool fills form fields in a PDF document. It can set text values for form fields, check/uncheck checkboxes, and select radio buttons. Inputs: - inputFilePath: Path to the input PDF file or file:// URL - outputFilePath: Path where the filled PDF will be saved - formFields: Object containing field names as keys and field values as values Example formFields: { "name": "John Doe", "email": "john@example.com", "agreeToTerms": true, "selectedOption": "Option B" } The tool returns information about which fields were successfully filled and any fields that could not be found or filled. Note: This tool only works with PDF forms that have defined form fields. For creating or modifying PDF content, use other PDF editing tools.. It is categorised as a Write tool in the Pdf Tools MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Add a rule in your Intercept YAML policy under the tools section for fill_pdf_form. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Pdf Tools MCP server.
fill_pdf_form 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_pdf_form rule in your Intercept 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 Intercept policy for fill_pdf_form. 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_pdf_form is provided by the Pdf Tools MCP server (@mcp-apps/pdf-tools-mcp-server). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic policy on every MCP tool call. Per-identity grants. Full audit log.