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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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An MCP Apps host (a client whose initialize capabilities name the io.modelcontextprotocol/ui extension with the text/html;profile=mcp-app mime) gets a t27f drawing as a ui:// resource; with no drawing it gets the markdown table. client_host() reads the two capability facts, carries_ui_resource() says whether a t27f result adds the resource, and UI_PAGE / UI_URI_VIEW / UI_URI_GRAPH / UI_EMPTY are the page and addresses the server serves. Tests: 12/12, 0 vacuous, on the Railway lab. Mutants: an MCP Apps resource with no drawing fails 2, client_host ignoring the mime fails 2, the readability mutant still fails 3. Seal regenerated. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Follows #10504, which merged and closed its issue. Refs #10531: this PR adds the
UI_RESOURCEchannel to the same spec. Base is master.What
specs/t27mcp/visual_output.t27now says when theUI_RESOURCEchannel is used and what it carries:answer_channel: an MCP Apps host getsCH_UI_RESOURCEwhen there is a drawing, andCH_MARKDOWN_TABLEwhen there is not.client_host(ui_extension, ui_mime): a client is an MCP Apps host only if its initialize capabilities name theio.modelcontextprotocol/uiextension and list thetext/html;profile=mcp-appmime. Any other client is treated as a CLI host.carries_ui_resource(host, svg): says whether a t27f tool result adds theui://resource. This is the only fact the server asks.UI_EXTENSION,UI_MIME,UI_URI_VIEW(ui://t27f/view),UI_URI_GRAPH(ui://t27f/graph),UI_PAGE(a script-free HTML page around the SVG) andUI_EMPTY(served before the first drawing).The server that consumes it is gHashTag/t27-mcp (stacked on t27-mcp#27).
Evidence (Railway lab, never the Mac)
client_hostignores the mime: fails 2font_px >= MIN_FONT_PX): still fails 3.trinity/seals/t27mcp_T27mcpVisualOutput.jsonwas regenerated with the seal command: spec sha2562c44da44…3960, 12/12.tools/callfort27f_graphandt27f_viewreturns[text, resource], and the resource hasuri: ui://t27f/graph|viewandmimeType: text/html;profile=mcp-app.[text]only.🤖 Generated with Claude Code