feat: MCP get_pass_chart — agents get a rendered sky chart back - #16
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Was 'over Observer' for raw lat/lon; now shows the coords in the chart title and summary.
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* docs: spec for MCP get_pass_chart (rendered sky chart tool)
* docs: implementation plan for MCP get_pass_chart
* refactor(og): rasterizeSvg(svg, {width}); rasterizeCard delegates
* feat(mcp): nextPassWindow — expose the next pass's raw window
* feat(og): renderPassChartSVG accepts satName for the chart title
* feat(mcp): pass-chart orchestrator — next pass -> PNG + summary
* feat(mcp): get_pass_chart tool returns an image + text content block
* docs(mcp): list get_pass_chart on llms.txt / mcp page / SKILL.md
* fix(mcp): label the chart by coordinates when no place name is given
Was 'over Observer' for raw lat/lon; now shows the coords in the chart
title and summary.
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Summary
Adds an MCP tool,
get_pass_chart, that returns a rendered polar sky chart (PNG) of a satellite's next pass over a location — the same annotated chart the web app shows (horizon circle, the pass arc, and the moon/planets/stars in their real positions), handed back to an AI agent as an image. Almost no MCP servers return rendered visuals; an agent that answers "when can I see the ISS from Tokyo?" with an actual picture of where to look is a real standout.Reuses the existing OG-image render pipeline — no new rendering.
renderPassChartSVG+@resvg/resvg-wasmalready produce the chart server-side for share-link images; the MCP'smakeEcefSampleris a drop-in for the OGissEcefAt.get_pass_chart(satellite, lat/lon or location, mode?)→ finds the next pass of that mode (72h scan), renders it, returns an image + text content block (text-only when there's no upcoming pass, so it degrades gracefully on text-only clients).nextPassWindowexposes the next pass's raw window (factored out ofsummarizePassvia a sharedpeakOf);rasterizeSvg(svg, {width})generalizesrasterizeCard;renderPassChartSVGnow takes asatNamefor the chart title./llms.txt, the/mcppage, andSKILL.md.Test plan
npm test— 381/381 pass, incl. anode:testintegration test that runs the real DOM + resvg-wasm render (returns a non-empty PNG for a pass; text-only for none).npm run typecheck && npm run build— clean; the{type:'image'}content block typechecks against the MCP SDK schema natively.tools/call get_pass_chart {satellite:"ISS", location:"Tokyo", mode:"radio"}→ animagecontent block (multi-KB base64 PNG) + a text summary.Spec/plan:
docs/superpowers/{specs,plans}/2026-06-15-mcp-pass-chart*.