What is sharpsir-charts-mcp-server AGENTS.md?

Repository instructions for a public MCP server that renders Chart.js charts on the server. Chart.js is a library for creating charts, while MCP lets a coding agent call tools exposed by another program.

Developing, testing, building, releasing, operating, and maintaining the sharpsir-charts-mcp-server repository.

It records development, operating, and rendering rules so changes to the chart server remain compatible with its expected behavior.

How gca-ltd/sharpsir-charts-mcp-server configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to gca-ltd/sharpsir-charts-mcp-server. 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/gca-ltd/sharpsir-charts-mcp-server/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/gca-ltd/sharpsir-charts-mcp-server

Made for: Codex, OpenCode.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/gca-ltd/sharpsir-charts-mcp-server/agents-md/github.svg)](https://agentmods.dev/instructions/gca-ltd/sharpsir-charts-mcp-server/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/gca-ltd/sharpsir-charts-mcp-server/agents-md"><img src="https://agentmods.dev/badge/instructions/gca-ltd/sharpsir-charts-mcp-server/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/gca-ltd/sharpsir-charts-mcp-server/agents-md"><img src="https://agentmods.dev/badge/instructions/gca-ltd/sharpsir-charts-mcp-server/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 584 This file is loaded in full into every session.

When invoked 584 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.

Model	Per session	Once invoked
Fable 5.1	$0.00584	$0.00584
Opus 5.5	$0.00234	$0.00234
Sonnet 5.5	$0.00117	$0.00117
Haiku 4.5	$0.00058	$0.00058

Measured 2mo ago against content hash 30e2bd5e2204, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

sharpsir-charts-mcp-server AGENTS.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.

AGENTS.md · 44 lines

How it starts

The opening of the file, as written. The whole thing — 44 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Sharp SIR Charts agent notes

sharpsir-charts-mcp-server is a public MIT-licensed MCP server for deterministic, server-side Chart.js rendering. The shipped default design is sothebys.

Development

npm ci
npm run typecheck
npm test
npm run build
npm run gallery

Do not add data connectors to this repository. Callers provide JSON data and the renderer writes image outputs locally.

Styling belongs in assets/designs/ and the strict Zod schema. Render tools must keep their six-part descriptions and explicit JSON-only/function prohibitions. Do not add inline Chart.js functions to tool inputs.

Operations

Stdio is the default. HTTP uses CHARTS_API_TOKEN, binds to loopback by default, and is intended to be placed behind Apache. Generated files are served from /charts/o/ only when the operator configures that output path.

The repository is hosted at https://github.com/gca-ltd/sharpsir-charts-mcp-server. Push main normally. Releases are tracked in RELEASE_NOTES.md; use scripts/release.sh for a manual version bump, then review, commit, tag and push the release.

Render invariants

Resolve value/category axes through axisRoles(indexAxis) in src/render/axis-roles.ts. Never branch on literal scales.x / scales.y for those semantics.
Paint subtitle, rule, footnote and watermark only inside bands from chromeMetrics() / titleChromePositions() / footnoteBaseline(). When hasTitle is false, titlePaddingBottom is folded into layoutPadding.top because Chart.js zeroes a hidden title box.
shouldDrawDirectLabels(design, datasets, chartType) is true only for bar / line / area. When true, suppress value-axis ticks and gridlines; place labels via resolveLabelPlacement with contrast-aware colour.
Keep grid.dash → border.dash (axis spine only) and legend.marker → pointStyle wired. Dashed reference lines use annotations.lines. axes.showXBorder / showYBorder AND with grid.axisBorder.
Radial charts use per-slice colours via resolveDatasetColors / isRadialChartType; doughnut cutout + centre/slice-label plugins are opt-in from render_part_to_whole.
KPI geometry comes from computeKpiGeometry / drawKpiCell so the sparkline never intersects the hairline rule.
Render-critical schema leaves must stay live (token-coverage test); intentionally unread leaves are listed in that test's allowlist.

Read the full file on GitHub · 44 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.

2mo ago First seen · 44 lines · 584 tokens per session scan A 30e2bd5e2204

Subscribe to this mod's changes

sharpsir-charts-mcp-server AGENTS.md is an instructions file published in the GitHub repository gca-ltd/sharpsir-charts-mcp-server (0 stars, last pushed 2mo ago), licensed MIT. It adds 584 tokens to every session, about $0.0023 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.

chart-js data-visualization luxury-design mcp mcp-server server-side rendering

sharpsir-charts-mcp-server AGENTS.md next to 6 instructions from other repositories
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sharpsir-charts-mcp-server: Instructions file for Codex