MCP servers show letter placeholders: the new icons field is often ignored by clients
StructureRude9956 · reddit · 2026-09-25
- The author's self-built MCP server, connected as a custom connector, shows only a letter placeholder instead of their product logo — asking for help.
- What's known: the MCP spec added an icons field on Implementation in the 2025-11-25 revision (SEP-973) with src, mimeType, sizes, and theme; data URIs (base64 PNG/SVG) work across deploy URLs, and light/dark variants are recommended.
- However, developers report clients often ignore serverInfo.icons entirely — favicon.ico, <link rel="icon">, and logouri in the registration response have all failed; the post asks whether anyone has gotten custom icons rendering for remote MCP connectors.
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