flint-chart-mcp
https://flint.data-formulator.ai
Registry code: 086425d0ffe88672
Flint compiles one semantic chart spec (ChartAssemblyInput) into Vega-Lite, ECharts, or Chart.js. By DEFAULT, prefer create_chart_view to return an interactive, customizable chart whenever the host supports MCP App UIs — it renders the chart live and lets the user tweak it. Fall back to render_chart for a static PNG/SVG artifact only when the host has no App UI support or the user explicitly wants a static image. Use compile_chart for the backend spec JSON, validate_chart to check a spec, and list_chart_types to discover chart types and their channels. Use list_themes to discover visual…
- endpoint
- https://flint.data-formulator.ai/mcp
- protocol
- streamable-http ·2025-06-18
- authentication
- none observed
- public key
- none — nobody has proven they own this listing · is it yours? claim it
- karma
- 0 · newcomer
- Is flint-chart-mcp live?
- Yes — it answered the hub's last check (checked 1h ago). It answered 100% of checks over the last 30 days.
- Is flint-chart-mcp free to use?
- Yes — the hub reached it with no key and no payment.
- What tools does flint-chart-mcp have?
- 6 tools: render_chart, compile_chart, validate_chart, create_chart_view, list_chart_types, list_themes.
- Is flint-chart-mcp safe to connect?
- The hub found no text in its card or tool descriptions aimed at the agent reading them. It measures what the server answers, not its code — grant it only the access its tools need.
reachable
live
uptime, 30 days
100%
90 days 100%· all time 100%
latency
491ms
last good check
priced tools
0
of 6 tools
- unknown → live
Calls placed through this hub's router, from its own receipts. Every caller and every payer counts the same; the chain total is counted from three payers.
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through this hub
calls served
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successful
paid through this hub
0 USDC
what callers paid
2 open 4 never probed 2 of 6 classified
Price is per tool, not per server. An agent whose handshake is open can hold tools that demand a key or a payment, and one figure for the whole agent sends callers into a wall.
list_chart_types open 1h ago
List the available chart types and their encoding channels for a backend, or for all backends when none is given.
{ "type": "object", "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "backend": { "enum": [ "vegalite", "echarts", "chartjs" ], "type": "string", "description": "Rendering backend. One of: vegalite, echarts, chartjs." } }, "additionalProperties": false }arguments 16 lineslist_themes open 1h ago
List Flint visual theme presets for `theme_spec` (for example, `theme_spec: "economist"`). Pass an `id` for preset-specific authoring guidance. To customize a preset, use an object with `extends` and a small set of overrides.
{ "type": "object", "$schema": "http://json-schema.org/draft-07/schema#", "properties": { "id": { "type": "string" } }, "additionalProperties": false }arguments 10 linesrender_chart unknown never probed
Compile a Flint chart spec for a backend and render it to a STATIC image (PNG) or vector (SVG), returned inline. Rendering is local/in-process. The chartjs backend supports PNG only. Prefer create_chart_view instead when the host supports MCP App UIs; use render_chart for a static artifact or when no App UI is available.
{ "type": "object", "$schema": "http://json-schema.org/draft-07/schema#", "required": [ "data", "chart_spec", "backend" ], "properties": { "data": { "type": "object", "properties": { "url": { "type": "string", "description": "DISABLED on this server — do NOT set. This server cannot read local files; provide the rows inline via `values` instead. Remote URLs are never fetched." }, "values": { "type": "array", "items": { "type": "object", "additionalProperties": {} }, "description": "Inline data rows (array of row objects), like Vega-Lite data.values. REQUIRED on this server: the only supported way to provide data." } }, "description": "Data source. Provide rows inline via `values`. Local file `url` references are disabled on this server.", "additionalProperties": false }, "scale": { "type": "number", "maximum": 4, "minimum": 0.5, "description": "Device scale for PNG raster (1 = design size, 2 = retina). Default: 1." }, "format": { "enum": [ "png", "svg" ], "type": "string", "description": "Output format. Default: png. chartjs supports png only." }, "backend": { "enum": [ "vegalite", "echarts", "chartjs" ], "type": "string", "description": "Rendering backend. One of: vegalite, echarts, chartjs." }, "options": { "type": "object", "description": "Assembler options (e.g. { addTooltips: true } and layout tuning).", "additionalProperties": {} }, "background": { "type": "string", "description": "Background color (CSS color). Default: #ffffff." }, "chart_spec": { "type": "object", "required": [ "chartType", "encodings" ], "properties": { "title": { "type": "string", "description": "Headline: what this chart says, in words. Strongly recommended — many design languages drop axis titles and rely on the headline to name the measure, so a chart without one reads as unlabelled numbers." }, "baseSize": { "type": "object", "required": [ "width", "height" ], "properties": { "width": { "type": "number" }, "height": { "type": "number" } }, "description": "Target canvas size in px (default 400×320). Flint's layout model stretches around this base up to the ceiling.", "additionalProperties": false }, "subtitle": { "type": "string", "description": "Deck: what is measured, of whom, when, and in what units. E.g. \"US population by age and sex, 2020, millions\"." }, "chartType": { "type": "string", "description": "Chart template name, e.g. \"Bar Chart\", \"Scatter Plot\", \"Heatmap\"." }, "encodings": { "type": "object", "description": "Channel → encoding map, e.g. { x: { field: \"region\" }, y: { field: \"revenue\" } }. A bare string is shorthand for { field: \"...\" }.", "additionalProperties": {} }, "canvasSize": { "type": "object", "required": [ "width", "height" ], "properties": { "width": { "type": "number" }, "height": { "type": "number" } }, "description": "Optional hard ceiling in px. Caps how far the chart may stretch beyond baseSize. When omitted, the cap is baseSize × the maxStretch option (default 2×).", "additionalProperties": false }, "chartProperties": { "type": "object", "description": "Template-specific properties (e.g. bar corner radius, show labels).", "additionalProperties": {} } }, "description": "What to draw.", "additionalProperties": false }, "theme_spec": { "anyOf": [ { "type": "string" }, { "type": "object", "additionalProperties": {} } ], "description": "Visual theme for Vega-Lite. Prefer a preset id from list_themes (e.g. \"economist\"). To customize it, pass an object with `extends` plus a small set of overrides. Full guide: https://microsoft.github.io/flint-chart/#/documentation/theme-spec" }, "semantic_types": { "type": "object", "description": "Field name → semantic type, e.g. { revenue: \"Quantity\", country: \"Country\" }. A value may instead be an annotation object when the type alone understates what you know, e.g. { rating: { semanticType: \"Score\", intrinsicDomain: [1, 5] } } — see the flint://agent-skill resource.", "additionalProperties": {} }, "field_display_names": { "type": "object", "description": "Field name → display label, used for axis titles and legend headers.", "additionalProperties": { "type": "string" } } }, "additionalProperties": false }arguments 154 linescompile_chart unknown never probed
Compile a Flint chart spec to a backend-native spec object (Vega-Lite / ECharts / Chart.js) without rendering. Returns the spec JSON, assembly warnings, and the computed layout size.
{ "type": "object", "$schema": "http://json-schema.org/draft-07/schema#", "required": [ "data", "chart_spec", "backend" ], "properties": { "data": { "type": "object", "properties": { "url": { "type": "string", "description": "DISABLED on this server — do NOT set. This server cannot read local files; provide the rows inline via `values` instead. Remote URLs are never fetched." }, "values": { "type": "array", "items": { "type": "object", "additionalProperties": {} }, "description": "Inline data rows (array of row objects), like Vega-Lite data.values. REQUIRED on this server: the only supported way to provide data." } }, "description": "Data source. Provide rows inline via `values`. Local file `url` references are disabled on this server.", "additionalProperties": false }, "backend": { "enum": [ "vegalite", "echarts", "chartjs" ], "type": "string", "description": "Rendering backend. One of: vegalite, echarts, chartjs." }, "options": { "type": "object", "description": "Assembler options (e.g. { addTooltips: true } and layout tuning).", "additionalProperties": {} }, "chart_spec": { "type": "object", "required": [ "chartType", "encodings" ], "properties": { "title": { "type": "string", "description": "Headline: what this chart says, in words. Strongly recommended — many design languages drop axis titles and rely on the headline to name the measure, so a chart without one reads as unlabelled numbers." }, "baseSize": { "type": "object", "required": [ "width", "height" ], "properties": { "width": { "type": "number" }, "height": { "type": "number" } }, "description": "Target canvas size in px (default 400×320). Flint's layout model stretches around this base up to the ceiling.", "additionalProperties": false }, "subtitle": { "type": "string", "description": "Deck: what is measured, of whom, when, and in what units. E.g. \"US population by age and sex, 2020, millions\"." }, "chartType": { "type": "string", "description": "Chart template name, e.g. \"Bar Chart\", \"Scatter Plot\", \"Heatmap\"." }, "encodings": { "type": "object", "description": "Channel → encoding map, e.g. { x: { field: \"region\" }, y: { field: \"revenue\" } }. A bare string is shorthand for { field: \"...\" }.", "additionalProperties": {} }, "canvasSize": { "type": "object", "required": [ "width", "height" ], "properties": { "width": { "type": "number" }, "height": { "type": "number" } }, "description": "Optional hard ceiling in px. Caps how far the chart may stretch beyond baseSize. When omitted, the cap is baseSize × the maxStretch option (default 2×).", "additionalProperties": false }, "chartProperties": { "type": "object", "description": "Template-specific properties (e.g. bar corner radius, show labels).", "additionalProperties": {} } }, "description": "What to draw.", "additionalProperties": false }, "theme_spec": { "anyOf": [ { "type": "string" }, { "type": "object", "additionalProperties": {} } ], "description": "Visual theme for Vega-Lite. Prefer a preset id from list_themes (e.g. \"economist\"). To customize it, pass an object with `extends` plus a small set of overrides. Full guide: https://microsoft.github.io/flint-chart/#/documentation/theme-spec" }, "semantic_types": { "type": "object", "description": "Field name → semantic type, e.g. { revenue: \"Quantity\", country: \"Country\" }. A value may instead be an annotation object when the type alone understates what you know, e.g. { rating: { semanticType: \"Score\", intrinsicDomain: [1, 5] } } — see the flint://agent-skill resource.", "additionalProperties": {} }, "field_display_names": { "type": "object", "description": "Field name → display label, used for axis titles and legend headers.", "additionalProperties": { "type": "string" } } }, "additionalProperties": false }arguments 136 linesvalidate_chart unknown never probed
Validate a Flint chart spec for a backend without rendering. Reports whether it is valid, all warnings/errors, and the computed layout size.
{ "type": "object", "$schema": "http://json-schema.org/draft-07/schema#", "required": [ "data", "chart_spec", "backend" ], "properties": { "data": { "type": "object", "properties": { "url": { "type": "string", "description": "DISABLED on this server — do NOT set. This server cannot read local files; provide the rows inline via `values` instead. Remote URLs are never fetched." }, "values": { "type": "array", "items": { "type": "object", "additionalProperties": {} }, "description": "Inline data rows (array of row objects), like Vega-Lite data.values. REQUIRED on this server: the only supported way to provide data." } }, "description": "Data source. Provide rows inline via `values`. Local file `url` references are disabled on this server.", "additionalProperties": false }, "backend": { "enum": [ "vegalite", "echarts", "chartjs" ], "type": "string", "description": "Rendering backend. One of: vegalite, echarts, chartjs." }, "options": { "type": "object", "description": "Assembler options (e.g. { addTooltips: true } and layout tuning).", "additionalProperties": {} }, "chart_spec": { "type": "object", "required": [ "chartType", "encodings" ], "properties": { "title": { "type": "string", "description": "Headline: what this chart says, in words. Strongly recommended — many design languages drop axis titles and rely on the headline to name the measure, so a chart without one reads as unlabelled numbers." }, "baseSize": { "type": "object", "required": [ "width", "height" ], "properties": { "width": { "type": "number" }, "height": { "type": "number" } }, "description": "Target canvas size in px (default 400×320). Flint's layout model stretches around this base up to the ceiling.", "additionalProperties": false }, "subtitle": { "type": "string", "description": "Deck: what is measured, of whom, when, and in what units. E.g. \"US population by age and sex, 2020, millions\"." }, "chartType": { "type": "string", "description": "Chart template name, e.g. \"Bar Chart\", \"Scatter Plot\", \"Heatmap\"." }, "encodings": { "type": "object", "description": "Channel → encoding map, e.g. { x: { field: \"region\" }, y: { field: \"revenue\" } }. A bare string is shorthand for { field: \"...\" }.", "additionalProperties": {} }, "canvasSize": { "type": "object", "required": [ "width", "height" ], "properties": { "width": { "type": "number" }, "height": { "type": "number" } }, "description": "Optional hard ceiling in px. Caps how far the chart may stretch beyond baseSize. When omitted, the cap is baseSize × the maxStretch option (default 2×).", "additionalProperties": false }, "chartProperties": { "type": "object", "description": "Template-specific properties (e.g. bar corner radius, show labels).", "additionalProperties": {} } }, "description": "What to draw.", "additionalProperties": false }, "theme_spec": { "anyOf": [ { "type": "string" }, { "type": "object", "additionalProperties": {} } ], "description": "Visual theme for Vega-Lite. Prefer a preset id from list_themes (e.g. \"economist\"). To customize it, pass an object with `extends` plus a small set of overrides. Full guide: https://microsoft.github.io/flint-chart/#/documentation/theme-spec" }, "semantic_types": { "type": "object", "description": "Field name → semantic type, e.g. { revenue: \"Quantity\", country: \"Country\" }. A value may instead be an annotation object when the type alone understates what you know, e.g. { rating: { semanticType: \"Score\", intrinsicDomain: [1, 5] } } — see the flint://agent-skill resource.", "additionalProperties": {} }, "field_display_names": { "type": "object", "description": "Field name → display label, used for axis titles and legend headers.", "additionalProperties": { "type": "string" } } }, "additionalProperties": false }arguments 136 linescreate_chart_view unknown never probed
PREFERRED DEFAULT for showing a chart when the host supports MCP App UIs. Open an interactive Flint chart view: renders the spec live as SVG and offers a customization panel (chart type, channel bindings, chart properties, sort) built from Flint's option model. Rendering and edits happen entirely in the host UI (Vega-Lite); no data leaves the host. Use this whenever the user wants to see a chart, not just when they ask to tweak it; fall back to render_chart only for a static image.
{ "type": "object", "$schema": "http://json-schema.org/draft-07/schema#", "required": [ "data", "chart_spec" ], "properties": { "data": { "type": "object", "properties": { "url": { "type": "string", "description": "DISABLED on this server — do NOT set. This server cannot read local files; provide the rows inline via `values` instead. Remote URLs are never fetched." }, "values": { "type": "array", "items": { "type": "object", "additionalProperties": {} }, "description": "Inline data rows (array of row objects), like Vega-Lite data.values. REQUIRED on this server: the only supported way to provide data." } }, "description": "Data source. Provide rows inline via `values`. Local file `url` references are disabled on this server.", "additionalProperties": false }, "options": { "type": "object", "description": "Assembler options (e.g. { addTooltips: true } and layout tuning).", "additionalProperties": {} }, "chart_spec": { "type": "object", "required": [ "chartType", "encodings" ], "properties": { "title": { "type": "string", "description": "Headline: what this chart says, in words. Strongly recommended — many design languages drop axis titles and rely on the headline to name the measure, so a chart without one reads as unlabelled numbers." }, "baseSize": { "type": "object", "required": [ "width", "height" ], "properties": { "width": { "type": "number" }, "height": { "type": "number" } }, "description": "Target canvas size in px (default 400×320). Flint's layout model stretches around this base up to the ceiling.", "additionalProperties": false }, "subtitle": { "type": "string", "description": "Deck: what is measured, of whom, when, and in what units. E.g. \"US population by age and sex, 2020, millions\"." }, "chartType": { "type": "string", "description": "Chart template name, e.g. \"Bar Chart\", \"Scatter Plot\", \"Heatmap\"." }, "encodings": { "type": "object", "description": "Channel → encoding map, e.g. { x: { field: \"region\" }, y: { field: \"revenue\" } }. A bare string is shorthand for { field: \"...\" }.", "additionalProperties": {} }, "canvasSize": { "type": "object", "required": [ "width", "height" ], "properties": { "width": { "type": "number" }, "height": { "type": "number" } }, "description": "Optional hard ceiling in px. Caps how far the chart may stretch beyond baseSize. When omitted, the cap is baseSize × the maxStretch option (default 2×).", "additionalProperties": false }, "chartProperties": { "type": "object", "description": "Template-specific properties (e.g. bar corner radius, show labels).", "additionalProperties": {} } }, "description": "What to draw.", "additionalProperties": false }, "theme_spec": { "anyOf": [ { "type": "string" }, { "type": "object", "additionalProperties": {} } ], "description": "Visual theme for Vega-Lite. Prefer a preset id from list_themes (e.g. \"economist\"). To customize it, pass an object with `extends` plus a small set of overrides. Full guide: https://microsoft.github.io/flint-chart/#/documentation/theme-spec" }, "semantic_types": { "type": "object", "description": "Field name → semantic type, e.g. { revenue: \"Quantity\", country: \"Country\" }. A value may instead be an annotation object when the type alone understates what you know, e.g. { rating: { semanticType: \"Score\", intrinsicDomain: [1, 5] } } — see the flint://agent-skill resource.", "additionalProperties": {} }, "field_display_names": { "type": "object", "description": "Field name → display label, used for axis titles and legend headers.", "additionalProperties": { "type": "string" } } }, "additionalProperties": false }arguments 126 lines
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card completeness
100%
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spec deviations
0
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