sharpsir-charts-mcp-server: Instructions file for Codex

AGENTS.md

sharpsir-charts-mcp-server AGENTS.md is an instructions file for Codex, OpenCode from gca-ltd/sharpsir-charts-mcp-server. It costs 584 tokens per session, scanned A, original, MIT.

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.

In plain words
What is it for?
Developing, testing, building, releasing, operating, and maintaining the sharpsir-charts-mcp-server repository.
Why use it?
It records development, operating, and rendering rules so changes to the chart server remain compatible with its expected behavior.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md.

This is gca-ltd/sharpsir-charts-mcp-server's own configuration. It tells Codex and OpenCode how to work on sharpsir-charts-mcp-server 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 sharpsir-charts-mcp-server configures →

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

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README.md
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Your own site
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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.

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<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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00584 $0.00584
Opus 5 $0.00292 $0.00292
Sonnet 5 $0.00117 $0.00117
Haiku 4.5 $0.00058 $0.00058

Measured 9d ago against content hash 30e2bd5e2204, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, 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 9d 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.dashborder.dash (axis spine only) and legend.markerpointStyle 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.

  1. 9d 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 9d ago), licensed MIT. It adds 584 tokens to every session, about $0.0029 per session on Opus 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.

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