Get the Baseline status for a web platform feature from W3C WebDX web-features data. Baseline indicates whether a feature is supported across all major browsers: -
AI agents call compat_get_baseline to retrieve information from Web Compat without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves compatibility/baseline status information about web platform features from a read-only data source. The verb 'get' combined with the context of checking support status across browsers indicates a straightforward data retrieval operation with no side effects, modification capabilities, or ability to execute code or trigger external actions.
From the tool's definition Tool description states 'Get the Baseline status' and 'retrieves' data from W3C WebDX web-features database. No modification, deletion, or execution of external operations mentioned.
Attacks that exploit this kind of access
Get the Baseline status for a web platform feature from W3C WebDX web-features data. Baseline indicates whether a feature is supported across all major browsers: -. It is categorised as a Read tool in the Web Compat MCP Server, which means it retrieves data without modifying state.
Register the Web Compat MCP server in PolicyLayer and add a rule for compat_get_baseline: 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 Web Compat. Nothing to install.
compat_get_baseline is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the compat_get_baseline 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 compat_get_baseline. 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.
compat_get_baseline is provided by the Web Compat MCP server (shuji-bonji/web-compat-mcp). 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.
Teams ship this data inside their own products. See what a licence covers →