This MCP server has three tools with varying levels of definition quality. All three tools have basic descriptions and input schemas, but quality is inconsistent. The 'navigate_and_screenshot' tool demonstrates reasonable schema structure, but the 'click' tool has a problematic compound name violating the single-responsibility principle. Parameter descriptions are present but minimal (under 72 chars baseline). The server lacks output schema documentation, error handling guidance for LLMs, and proper parameter constraints. Overall, the definitions fall short of production quality, descriptions are too terse, parameter documentation lacks formatting/constraint details, and output structures are not formally documented.
Tool 'navigate_and_screenshot' contains 'and', signals multiple responsibilities. Should split into 'navigate' + 'screenshot' so agents can compose them independently.
Tool 'click' is misleading. A selector alone does not tell the LLM what element it targets or why clicking it matters. The required 'url' parameter is a hidden dependency (must navigate before clicking), not surfaced in the name or description.
All tool descriptions are under 100 characters (baseline 194 chars). They lack WHEN/WHY context. E.g., 'navigate_and_screenshot' does not explain that it returns base64-encoded image data or when to use it vs 'click'.
Parameter 'url' in 'navigate_and_screenshot' lacks format documentation. Should specify: valid HTTP/HTTPS URLs, max length, whether relative URLs are allowed.
Recommendations
Split 'navigate_and_screenshot' into two tools: 'navigate_to_url' (readOnly, returns page title/status) and 'capture_screenshot' (readOnly, returns base64 image). This enables agents to navigate without capturing, or capture multiple times without re-navigating.
Rename 'click' to 'click_element_and_screenshot' to clarify that it both performs action AND captures state. Add description: 'Non-idempotent. Clicks a CSS selector and returns screenshot. Retry only if prior attempt failed to connect; repeated calls on same selector may have unintended side effects.'
Expand 'navigate_and_screenshot' description to 80-150 chars: 'Navigate to a URL and capture a screenshot of the loaded page. Returns base64-encoded image (PNG format). Use to verify page state or identify clickable elements for subsequent 'click' calls.'
Expand 'click' description to include: 'Navigates to URL, waits for element matching CSS selector, clicks it, waits 1 second, captures screenshot. Returns base64-encoded image (PNG). Non-idempotent, use for single intended interaction.'
Add parameter constraints: 'url must be valid http:// or https:// URL (1 - 2048 chars). Relative URLs not supported.' For 'selector': 'Must be valid CSS selector string. Matches first element; if multiple match, selects first in DOM. Supports standard CSS3 selectors (class, id, attribute, pseudo-selectors).'
Document output schema for screenshot tools: 'Returns object {content: [{type: "text", text: "<base64-png-string>"}]}. Decode text field as base64 PNG image. Image reflects page state at capture time.'
Parameter 'selector' in 'click' is underdescribed. Should clarify: CSS selector syntax, whether XPath is supported, expected element types (button, link, input), and what happens if selector matches multiple elements.
Output schemas are not documented. Tools return base64 screenshots as plain text strings, the LLM cannot know the encoding format or that it must be decoded as an image. Document return structure: {content: [{type: 'text'|'image', text: string, mimeType?: string}].
Error handling does not guide LLM recovery. Example: navigate_and_screenshot throws 'Failed to navigate and take screenshot: <error>', too generic. Should guide: 'Invalid URL format. Use http:// or https:// and ensure domain is reachable.'
'click' tool is stateful and non-idempotent: clicking the same element twice has different effects (first click does action, second may produce error or new state). Tool description does not warn LLM of this, risking retry loops with unintended consequences.
No tool annotations present. Critical for agent planning: 'navigate_and_screenshot' is readOnly; 'click' is destructive (modifies page state). Tool definitions lack readOnlyHint and destructiveHint.
navigate_and_screenshotclick
Improve error messages: On navigation failure, return 'Failed to navigate to <URL>. Possible causes: invalid URL format, domain unreachable, network timeout (>30s). Verify URL syntax (http/https required) and network access.' On click failure: 'Selector "<selector>" did not match any element after 5s wait. Verify selector syntax and that element exists after navigation. Try 'navigate_and_screenshot' first to inspect page.'
Add tool annotations to tool definitions. In ListToolsRequestSchema handler, add to each tool object: {name, description, inputSchema, ..., annotations: {readOnlyHint: true} for navigate_and_screenshot; destructiveHint: true for click}.
For 'create_note', add description: 'Creates a new in-memory note with title and content. Note is stored locally and persists for the session lifetime. Suitable for capturing summaries or scratch work during a task. Returns note ID and confirmation message.'
Add clarification to 'create_note' parameters: 'title (1-100 chars, required): unique human-readable note name. content (1-10000 chars, required): note body text (plain text or markdown).' This guides LLM on what constitutes valid input.