Fill multiple form fields in the current Safari page at once. Each field can be identified by CSS selector or label text (case-insensitive substring match against label, placeholder, name, id, or aria-label). Supports text inputs, checkboxes, radio buttons, and select dropdowns. For <select multi...
AI agents use fill_form to create or update resources in MacWright — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your MacWright environment.
This tool writes data into web form fields in Safari. It modifies the state of a web page by filling in form inputs, which could submit personal information, credentials, or other sensitive data. While it doesn't submit the form itself, filling forms is a Write action with high severity because an AI agent could autofill sensitive fields (passwords, financial info, personal data) without user awareness.
From the tool's definition Fill multiple form fields in the current Safari page at once... Supports text inputs, checkboxes, radio buttons, and select dropdowns.
Attacks that exploit this kind of access
Fill multiple form fields in the current Safari page at once. Each field can be identified by CSS selector or label text (case-insensitive substring match against label, placeholder, name, id, or aria-label). Supports text inputs, checkboxes, radio buttons, and select dropdowns. For <select multiple>, use comma-separated values (e.g. It is categorised as a Write tool in the MacWright MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the MacWright MCP server in PolicyLayer and add a rule for fill_form: 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 MacWright. Nothing to install.
fill_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_form 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_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_form is provided by the MacWright MCP server (ruchit-p/macwright). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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