MCP-Server

Axcess — Design Accessibility Evaluation

io.github.sicxz/axcess
Design & Kreativ Öffentlich und erreichbar MCP 2025-11-25

Was dieses MCP kann

Evaluates UI designs and typography for accessibility issues, including touch targets, contrast, focus indicators, and readability.

evaluate_accessibility
Evaluate UI Accessibility
Evaluates UI elements for accessibility issues that automated scanners miss. COST: $0.01 USDC via x402 on Base-compatible EVM network per call. Checks beyond what axe/Lighthouse/WAVE catch at the design stage: - Touch targets below 24×24px (WCAG 2.5.8 AA hard fail) - Touch targets below 44×44px (WCAG 2.5.5 AAA recommended) - Information conveyed by color alone without a secondary indicator (WCAG 1.4.1) - Missing focus indicators on interactive elements (WCAG 2.4.7) - Focus rings thinner than 2px (WCAG 2.4.11) - Focus ring contrast below 3:1 against adjacent background (WCAG 2.4.11) - Interactive elements below the practical usability height floor Args: - elements: Array of 1–50 UI element objects - screen_name: Optional label for the evaluation report Each element requires: element_type. Provide width_px/height_px for touch target checks. Provide uses_color_only + secondary indicator flags for 1.4.1 checks. Provide is_interactive + focus_visible + focus indicator properties for focus checks. Returns: Structured report with: - Per-element scores (0–100) and specific issues - Severity levels (critical/major/minor) with WCAG references - What automated tools miss and why - Concrete fix recommendations - Overall score and verdict (pass/needs_work/fail) - Top issues sorted by severity
Nur Lesen Idempotent
Eingabeschema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['elements'], 'properties': {'elements': {'type': 'array', 'items': {'type': 'object', 'required': ['element_type'], 'properties': {'state': {'enum': ['default', 'hover', 'focus', 'active', 'disabled', 'error', 'success'], 'type': 'string', 'description': 'Interaction state being evaluated'}, 'context': {'type': 'string', 'description': 'Brief description of the element\'s role (e.g. "primary CTA", "error state badge")'}, 'width_px': {'type': 'number', 'description': 'Rendered width of the element in px', 'exclusiveMinimum': 0}, 'color_hex': {'type': 'string', 'pattern': '^#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$', 'description': 'Primary element color as hex'}, 'height_px': {'type': 'number', 'description': 'Rendered height of the element in px', 'exclusiveMinimum': 0}, 'element_id': {'type': 'string', 'description': 'Optional ID for tracking (e.g. Figma node ID)'}, 'element_type': {'enum': ['button', 'link', 'input', 'checkbox', 'radio', 'select', 'icon', 'badge', 'alert', 'text', 'image', 'navigation', 'heading'], 'type': 'string', 'description': 'Semantic role of the UI element'}, 'focus_visible': {'type': 'boolean', 'description': 'True if a visible focus indicator is shown in the focused state'}, 'has_icon_label': {'type': 'boolean', 'description': 'True if the element has a supplementary icon'}, 'has_text_label': {'type': 'boolean', 'description': 'True if the element has a visible text label'}, 'is_interactive': {'type': 'boolean', 'description': 'True if users can click, tap, or keyboard-navigate this element'}, 'uses_color_only': {'type': 'boolean', 'description': 'True if color is the only way this element communicates state or meaning'}, 'background_color_hex': {'type': 'string', 'pattern': '^#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$', 'description': 'Background color behind the element as hex'}, 'has_pattern_or_shape': {'type': 'boolean', 'description': 'True if the element uses shape or pattern as a secondary indicator'}, 'focus_indicator_width_px': {'type': 'number', 'description': 'Stroke width of the focus outline in px', 'exclusiveMinimum': 0}, 'focus_indicator_color_hex': {'type': 'string', 'pattern': '^#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$', 'description': 'Color of the focus ring/outline as hex'}, 'focus_indicator_background_color_hex': {'type': 'string', 'pattern': '^#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$', 'description': 'Background color immediately behind the focus indicator as hex'}}, 'additionalProperties': False}, 'maxItems': 50, 'minItems': 1, 'description': 'Array of UI elements to evaluate'}, 'screen_name': {'type': 'string', 'description': 'Name of the screen or component being evaluated'}}, 'additionalProperties': False}
evaluate_typography
Evaluate Typography Accessibility
Evaluates typography elements against a principled accessibility rubric. COST: $0.05 USDC via x402 on Base-compatible EVM network per call. Goes beyond what axe/Lighthouse/WAVE can check — evaluates design judgment, not just numeric compliance. Catches issues like: - Contrast that passes WCAG 4.5:1 but fails visually due to thin font weight - Body text that meets minimum size requirements but is still too small for comfortable reading - Line heights that technically comply but impede readability for dyslexic users - Extended all-caps or italic text that passes all AA criteria but impairs reading - Text on gradient/image backgrounds where scanner sampling is unreliable - Heading sizes that are technically correct but visually indistinct from body Args: - elements: Array of 1–50 typography element objects with font/color properties - screen_name: Optional label for the evaluation report Each element requires: element_type, font_size, font_weight, line_height, color_hex, background_color_hex. Returns: Structured report with: - Per-element scores (0–100) - Specific issues with severity (critical/major/minor) - WCAG references and what automated tools miss - Concrete fix recommendations - Overall score and verdict (pass/needs_work/fail) - Top issues sorted by severity Example use: Extract text layer properties from Figma using get_design_context, pass the typography properties to this tool for evaluation before shipping.
Nur Lesen Idempotent
Eingabeschema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'required': ['elements'], 'properties': {'elements': {'type': 'array', 'items': {'type': 'object', 'required': ['element_type', 'font_size', 'font_weight', 'line_height', 'color_hex', 'background_color_hex'], 'properties': {'context': {'type': 'string', 'description': 'Brief description of role in design (e.g. "hero heading", "footer legal copy")'}, 'color_hex': {'type': 'string', 'pattern': '^#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$', 'description': 'Text color as hex (e.g. #1a1a1a)'}, 'font_size': {'type': 'number', 'description': 'Font size in px', 'exclusiveMinimum': 0}, 'element_id': {'type': 'string', 'description': 'Optional ID for tracking (e.g. Figma node ID)'}, 'font_style': {'enum': ['normal', 'italic'], 'type': 'string', 'description': 'CSS font-style'}, 'font_weight': {'type': 'integer', 'maximum': 900, 'minimum': 100, 'description': 'Font weight (100=thin, 400=regular, 700=bold, 900=black)'}, 'line_height': {'type': 'number', 'description': 'Line height as a multiplier (e.g. 1.5, not px)', 'exclusiveMinimum': 0}, 'element_type': {'enum': ['heading', 'body', 'caption', 'label', 'button', 'display', 'ui'], 'type': 'string', 'description': 'Semantic role of the text element'}, 'heading_level': {'type': 'integer', 'maximum': 6, 'minimum': 1, 'description': 'Heading level if element_type is heading (1–6)'}, 'content_length': {'type': 'integer', 'minimum': 0, 'description': 'Character count of the actual text content'}, 'letter_spacing': {'type': 'number', 'description': 'Letter spacing in em (e.g. -0.02 for tight, 0.05 for loose)'}, 'text_transform': {'enum': ['none', 'uppercase', 'lowercase', 'capitalize'], 'type': 'string', 'description': 'CSS text-transform value'}, 'background_type': {'enum': ['solid', 'gradient', 'image', 'pattern'], 'type': 'string', 'description': 'Background type — non-solid backgrounds require special handling'}, 'background_color_hex': {'type': 'string', 'pattern': '^#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$', 'description': 'Background color as hex (e.g. #ffffff)'}}, 'additionalProperties': False}, 'maxItems': 50, 'minItems': 1, 'description': 'Array of typography elements to evaluate'}, 'screen_name': {'type': 'string', 'description': 'Name of the screen or component being evaluated'}}, 'additionalProperties': False}
list_capabilities
List Axcess Capabilities & Pricing
Returns available evaluation tools, what they check, and their pricing. Call this first to understand what Axcess can evaluate and how much each evaluation costs. This tool is FREE. All evaluation tools require USDC payment on Base network. Returns: JSON with tool descriptions, pricing, and rubric categories.
Nur Lesen Idempotent
Eingabeschema
{'type': 'object', '$schema': 'http://json-schema.org/draft-07/schema#', 'properties': {}, 'additionalProperties': False}
Hinzugefügt
evaluate_accessibility
17. September 2026 12:52
Hinzugefügt
evaluate_typography
17. September 2026 12:52
Hinzugefügt
list_capabilities
17. September 2026 12:52