The server defines 3 tools with reasonable structure, but has mixed quality across naming, descriptions, and schemas. Tool names follow verb-first convention (initiate_session, list_tabs, execute_js), which is correct. Descriptions exist and are substantive (100+ chars each), but lack clarity on when to use vs. alternatives and return structures. Schemas are partially visible but incomplete in key areas: execute_js output schema is entirely missing, list_tabs has complex optional fields with no guidance on which to request, and parameter relationships (extensionConnectionId + sessionToken as paired prerequisites) are documented but could be clearer. Error handling and recovery guidance are absent from descriptions. The hostnames parameter validation rule (regex pattern for wildcard masks) is documented in the description but not enforced in visible schema constraints.

• Add explicit output schema for execute_js: document return type (JSON value, string, null), error format (including timeout/syntax error cases), and max result size.
• For list_tabs, add parameter guidance recommending which tabProps to request for common use cases (e.g., 'url,title,id' for filtering, 'url,id' for navigation). Document return structure as array of tab objects.
• Document initiate_session return value schema explicitly: {sessionToken: string, extensionConnectionId: string} on approval, or error on rejection.
• Add 'Prerequisites' section to list_tabs and execute_js descriptions: 'Requires a session obtained from initiate_session. Provide both extensionConnectionId and sessionToken from that call.'
• Provide 2-3 concrete tabFilter examples in the parameter description (e.g., {active: true}, {url: {$regex: '://github.com/'}}, {title: {$regex: 'bug', $options: 'i'}}).
• For initiate_session hostnames parameter: document what 'approval dialog' means, what happens if user denies, and what the security model protects against. State that omitting hostnames requests all-tab access.
• Add error handling guidance to all three tool descriptions: 'If broker is unavailable, retry with exponential backoff. If tab ID is invalid, call list_tabs() to refresh available tabs.'
• Document execute_js timeout behavior (e.g., '30-second timeout') and what error is returned (timeout vs. syntax error vs. permission denied).
• Clarify hostnames validation rule in schema with a pattern constraint instead of only text description. E.g., 'must match ^\*\..+\..+$ or ^[a-z0-9.-]+$'.

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry