Medium Risk

fill_form

Fill out multiple form elements at once

Part of the Browserous - Instant Browser for Your Agent MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.

AI agents use fill_form to create or modify resources in Browserous - Instant Browser for Your Agent. 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_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 Browserous - Instant Browser for Your Agent.

Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.

browserous-browserous.yaml
tools:
  fill_form:
    rules:
      - action: allow
        rate_limit:
          max: 30
          window: 60

See the full Browserous - Instant Browser for Your Agent policy for all 26 tools.

Tool Name fill_form
Category Write
Risk Level Medium

View all 26 tools →

Agents calling write-class tools like fill_form have been implicated in these attack patterns. Read the full case and prevention policy for each:

Browse the full MCP Attack Database →

Other tools in the Write risk category across the catalogue. The same policy patterns (rate-limit, validate) apply to each.

What does the fill_form tool do? +

Fill out multiple form elements at once. It is categorised as a Write tool in the Browserous - Instant Browser for Your Agent MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on fill_form? +

Add a rule in your Intercept YAML policy under the tools section for fill_form. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Browserous - Instant Browser for Your Agent MCP server.

What risk level is fill_form? +

fill_form is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit fill_form? +

Yes. Add a rate_limit block to the fill_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.

How do I block fill_form completely? +

Set action: deny in the Intercept policy for fill_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.

What MCP server provides fill_form? +

fill_form is provided by the Browserous - Instant Browser for Your Agent MCP server (browserous/browserous). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Let agents act without letting them run wild.

Deterministic policy on every MCP tool call. Per-identity grants. Full audit log.

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