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mcp-charts: Instructions file for Claude Code

CLAUDE.md

mcp-charts CLAUDE.md is an instructions file for Claude Code from bonnard-data/mcp-charts. It costs 1,164 tokens per session, scanned A, original, MIT.

Repository instructions for an open-source MCP library that renders charts and dashboards in an embedded ECharts widget. MCP connects AI hosts to tools, while ECharts is a library for displaying data visualizations.

In plain words
What is it for?
Use it when editing chart rendering, the embedded widget, dashboard helpers, examples, or the package scaffold and release process.
Why use it?
It explains the separate packages, widget-embedding build step, repository layout, and development rules needed to change the chart system correctly.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md.

This is bonnard-data/mcp-charts's own configuration. It tells Claude Code how to work on mcp-charts itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything mcp-charts configures →

not rated 11repo 2mo ago A scan 1,164 tokens original MIT
View source ↗ bonnard-data/mcp-charts bonnard.dev
Reuse

Borrowing it

Nothing to install: this file belongs to bonnard-data/mcp-charts. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/bonnard-data/mcp-charts/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/bonnard-data/mcp-charts

Made for: Claude Code.

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Per session 1,164 This file is loaded in full into every session.
When invoked 1,164 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.01164 $0.01164
Opus 5.5 $0.00466 $0.00466
Sonnet 5.5 $0.00233 $0.00233
Haiku 4.5 $0.00116 $0.00116

Measured 2mo ago against content hash 69d0fb13818a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mcp-charts CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 64 lines

How it starts

The opening of the file, as written. The whole thing — 64 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md — bonnard-mcp-charts

OSS (MIT) horizontal MCP charting/dashboards library. A dev returns a ChartSpec/DashboardSpec from an MCP tool; the embedded widget renders it with ECharts inside the host (Claude Desktop / ChatGPT / MCP Inspector). Its own git repo (bonnard-data/mcp-charts), nested inside the outer data-mcp git and a sibling of mcp-platform — they are separate gits; Agent isolation:"worktree" can grab the wrong copy, so make a MANUAL worktree of THIS repo if isolating.

Layout

  • packages/core (@bonnard/mcp-charts, tsup) — the render compiler (resolve()), types, the DX helpers (chart/chartCell/dashboardResult/addViews), and the embedded widget HTML.
  • packages/widget (@bonnard/mcp-charts-widget, vite) — the in-iframe renderer. Builds to ONE inlined dist/index.html, embedded into core via packages/core/scripts/embed-widget.mjs -> packages/core/src/generated/widget-html.ts. Edit widget -> pnpm build re-embeds it into core.
  • examples/{dashboard,quickstart} — runnable MCP servers (stateless Streamable HTTP at /mcp).
  • packages/create-mcp-charts — the npm create @bonnard/mcp-charts scaffold generator (private).
  • Docs: docs/DEV-HARNESS.md.

Build / test

  • pnpm build — widget (single-file) then core (embeds widget). pnpm typecheck, pnpm test (199 core + 59 widget), pnpm lint, pnpm check (format + lint + typecheck).

Dev loop (pick by what you're editing)

  • Widget renderer / core inference -> pnpm dev:harness — HMR preview: the real widget in an iframe, fed specs from core resolve() (source), no build/embed/restart. (docs/DEV-HARNESS.md)
  • Driving the MCP tools -> pnpm dev:inspect — MCP Inspector against the example server (port 3011).
  • Before a release -> pnpm uat — render-pipeline gate: renders every view + all fixtures through SSR, fails on blank charts. Port 3021.
  • Fresh consumer project -> npm create @bonnard/mcp-charts my-server (local: node packages/create-mcp-charts/bin/index.mjs <dir>).

Read the full file on GitHub · 64 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 64 lines · 1,164 tokens per session scan A 69d0fb13818a

Subscribe to this mod's changes

mcp-charts CLAUDE.md is an instructions file published in the GitHub repository bonnard-data/mcp-charts (11 stars, last pushed 2mo ago), licensed MIT. It adds 1,164 tokens to every session, about $0.0047 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Analytics and metricsai-agentschartsdata-visualizationmcpmodel-context-protocol
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