"Tools for optimizing prompts" matching MCP connectors:

Share prototypes for team review: publish HTML, reviewers pin notes, pull feedback back to apply.

Design references for coding agents: real product screens, sections and decoded design tokens.

rnv-color-mcp, a hosted color-workflow MCP server (Python, Streamable HTTP). Tools: mix (including Kubelka-Munk paint physics), convert between formats, generate harmonies, transform text case, and save/list/get named palettes. It resolves hex / CSS / custom brand color names and refuses unknown colors rather than guessing.

Opens, inspects, and renders DXF/CAD drawings for AI agents: describe_dxf returns structured facts (layers with actual drawn colors, units, bounds, text content) and render_dxf returns PNG images. On MCP Apps hosts like ChatGPT and Claude, view_dxf opens an interactive in-chat viewer with pan, zoom, and layer toggles.

uxspot.io UX reference: glossary, AI x UX tools directory, checklists and Learn UX curriculum

Design review for UI code: 258 rules across 9 categories, scored 0-100 with concrete fixes.

320K+ open-source SVG icons: 12 tools, anonymous metadata search; SVG, exports, collections via Pro.

Generate deterministic placeholder image URLs and packs for docs, staging, testing, and AI agents.

x402-paid tools: text to 3D-printable STL, web search, and search+read. USDC on Base.

Semantic SVG icon search and recommendations for AI coding agents.

Anti-slop design taste for AI coding agents: art directions, section code, 0-100 page critic.

AI-agent design tools: fonts, palettes, color naming & extraction, contrast, code, SVG, CSS.

Read-only catalog of the @blueprint-modular/core design system (104 components). Four tools — list/search/get components and suggest compositions. Public, no auth, Streamable HTTP.

Generate logos, social posts, app screenshots, comic panels & visual-novel assets from prompts.

AI Hub for AEC — 50+ 3D formats, clash detection, ACC integration via Autodesk Platform Services.

Visual AI for strategic thinking — SWOT, flowcharts, mindmaps, Gantt diagrams as polished SVG.

Geometry and CAD file metadata extraction for STL, OBJ, PLY, PCD, LAS/LAZ, glTF/GLB.

Evaluates UI designs for WCAG accessibility issues automated scanners miss. Paid via x402 on Base.

Brand audits, visual catalogs, AI proposals & checkout for LATAM SMBs. Full funnel via MCP.

EN Diagram — structural verification for concurrent systems. Pure math, no AI.