Carto Render Inline Map Agent Skill

Render an ad-hoc interactive map inline in the chat from a deck.gl declarative spec via the CARTO MCP server's view_map tool.

Context cost
8.8k tokensestimated from the bundle, loaded when it triggers
Bundle
2 files · 35.3 kBtext throughout, nothing executable
Licence
MITthe author’s own terms
Last change
—no release on file
Servers it uses
Noneruns standalone

What it does

Render an ad-hoc interactive map inline in the chat from a deck.gl declarative spec via the CARTO MCP server's view_map tool. Use whenever the user asks to map, visualize, or show the geographic distribution of points, polygons, hexagons, quadbins, clusters, density (heatmaps), or raster — and the map is exploratory or throwaway, not meant to be saved as a permanent CARTO Builder map. Triggers on "show me X on a map", "visualize Y", "make a heatmap of Z", "render the points/clusters/raster of W".

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

data sciencemcp

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md6.5 kB · preview
--- name: carto-render-inline-map license: MIT ---
7# carto-render-inline-map
8
9Renders an ad-hoc interactive map inline in the chat via the CARTO MCP server's view_map tool. The agent emits a @deck.gl/json declarative spec; the renderer handles credentials, basemap, and tooltips. The user sees the map without leaving the chat.
10
11**Legend required after every render.** The view_map renderer does NOT show an auto-legend. After invoking view_map, render a legend through the host's widget surface (e.g., show_widget in Claude.ai / Claude Desktop) — that is the ONLY visual transport that works. Chat-message HTML is escaped by every major host's renderer and appears as raw text — DO NOT emit HTML in your chat reply. If the host has no widget tool, fall back to a plain-text legend (markdown bullets with emoji color squares per bucket, hex codes in parentheses). The full HTML template, style rules, and per-helper variants (colorBins swatches, colorContinuous gradient bar, colorCategories per-category, raster ternary-bucket + nodata) live in the view_map tool description's LEGEND section. Applies to ad-hoc view_map specs ONLY; a saved Builder map loaded inline (see carto-preview-builder-map) carries its own Builder-native legend.
12
13**Tool contract.** This skill consumes the view_map tool exposed by the CARTO MCP server. The tool's input shape (deckglProps), layer-source compatibility, aggregationExp requirements, and @@= expression-eval restrictions are documented in the tool's own MCP description — read it via the MCP host's tool-inspector or by calling tools/list. This skill stays focused on routing, cartography, and the agent's reply; it does NOT duplicate the tool's spec.
14
15This skill is **MCP-only**: view_map renders inline ONLY on the CARTO MCP server, and ONLY on hosts that support MCP Apps (Claude.ai, Claude Desktop, ChatGPT). There is no CLI equivalent for inline rendering. view_map is offered on both OAuth and token MCP sessions.
16
17## Step 1 — detect what's available
18
19For detection signals and host support, see [carto-basics/references/access-paths.md](../carto-basics/references/access-paths.md). Quick check: view_map must be in your tool list, and the host must render MCP Apps.
20
21| Setup | What to do |
22|---|---|
23| view_map present + host renders | Proceed normally. |
24| view_map present + host doesn't render (Gemini CLI, Codex CLI, MCP Inspector, MCPJam — text-only) | Tell the user the host can't render maps inline; suggest switching hosts or — where a shell is available — carto-create-builder-maps + carto maps screenshot for a PNG. |
25| view_map not present | The MCP server isn't attached. Tell the user; don't fall back to a generic visualization widget. |
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md919 words
Files2
LicenceMIT
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈200
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
8,625
on trigger
The instruction body and 1 supporting file, read only when the skill fires.
4.4%
of a 200k window
Ten skills this size would take about 44% of the window before you open a file.
050k100k150k200k context window

8.8k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

2 files, 35.3 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md6.5 kB
  • references/cartography.md28.8 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 2 files you can review in full before installing. The MIT licence covers the templates and examples as well as the instructions.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# Carto Render Inline Map · 8.8k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/carto-render-inline-map/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/carto-render-inline-map" ] && { [ ! -e .claude/skills/carto-render-inline-map ] || { mv .claude/skills/carto-render-inline-map "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/carto-render-inline-map" .claude/skills/ && echo "Installed .claude/skills/carto-render-inline-map"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add cartodb/carto-render-inline-map

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/carto-render-inline-map/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/carto-render-inline-map/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/carto-render-inline-map" ] && { [ ! -e ~/.claude/skills/carto-render-inline-map ] || { mv ~/.claude/skills/carto-render-inline-map "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/carto-render-inline-map" ~/.claude/skills/ && echo "Installed ~/.claude/skills/carto-render-inline-map" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/carto-render-inline-map/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Versionnot versioned
Publishedno release date on file
PriceFree
Referencecartodb/carto-render-inline-map

Versions

Its author publishes no version number, so there is nothing here to pin to: what you install is the folder as it stands today. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

Pinning

Nothing to pin to: this skill carries no version number of its own. What you install is what the folder holds on the day you install it.

Reviews

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