Type text into an input field on the current browser page. Clears the field first, then types the value.
Part of the Screenshotsmcp MCP server. Enforce policies on this tool with Intercept, the open-source MCP proxy.
AI agents use browser_fill to create or modify resources in Screenshotsmcp. 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 browser_fill 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 Screenshotsmcp.
Write tools can modify data. A rate limit prevents runaway bulk operations from AI agents.
tools:
browser_fill:
rules:
- action: allow
rate_limit:
max: 30
window: 60See the full Screenshotsmcp policy for all 56 tools.
Agents calling write-class tools like browser_fill 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.
Type text into an input field on the current browser page. Clears the field first, then types the value.. It is categorised as a Write tool in the Screenshotsmcp 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 browser_fill. You can allow, deny, rate-limit, or validate arguments. Then run Intercept as a proxy in front of the Screenshotsmcp MCP server.
browser_fill 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 browser_fill 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 browser_fill. 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.
browser_fill is provided by the Screenshotsmcp MCP server (relievedattention992-smithery/screenshotsmcp). Intercept sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Open source. One binary. Zero dependencies.
npx -y @policylayer/intercept