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geogebra-mcp-server: Instructions file for Codex

AGENTS.md

geogebra-mcp-server AGENTS.md is an instructions file for Codex, OpenCode from YZDame/geogebra-mcp-server. It costs 438 tokens per session, scanned A, original, MIT.

A project instruction file for a TypeScript MCP server that connects AI requests to GeoGebra, a tool for interactive mathematics and graphing. It describes the code layout and rules for adding or changing tools.

In plain words
What is it for?
Use it when developing or testing the GeoGebra MCP server, adding educational or performance tools, or changing its tool registry.
Why use it?
It helps developers understand where server, tool, validation, and test code belongs. It also protects response compatibility, clean machine-readable output, and safe file paths.

Instructions file for CodexOpenCode

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

This is YZDame/geogebra-mcp-server's own configuration. It tells Codex and OpenCode how to work on geogebra-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 geogebra-mcp-server configures →

not rated 2repo 29d ago A scan 438 tokens original MIT
View source ↗ YZDame/geogebra-mcp-server
Reuse

Borrowing it

Nothing to install: this file belongs to YZDame/geogebra-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/YZDame/geogebra-mcp-server/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/YZDame/geogebra-mcp-server

Made for: Codex, OpenCode.

Wrote this? Show the measurements

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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/yzdame/geogebra-mcp-server/agents-md"><img src="https://agentmods.dev/badge/instructions/yzdame/geogebra-mcp-server/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 438 This file is loaded in full into every session.
When invoked 438 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 $0.00438 $0.00438
Opus 5.5 $0.00175 $0.00175
Sonnet 5.5 $0.00088 $0.00088
Haiku 4.5 $0.00044 $0.00044

Measured 2mo ago against content hash 2c7828b2cd94, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

geogebra-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 · 47 lines

What it actually says

AGENTS.md

Project Context

  • Project type: Node.js + TypeScript MCP server for GeoGebra.
  • Runtime role: this repo is an MCP tool server (not a chat UI).
  • Main flow: client LLM -> MCP JSON-RPC -> tool registry -> GeoGebra execution -> structured response/export.

Code Map

  • Entry: src/index.ts, CLI: src/cli.ts
  • MCP server: src/server.ts
  • Tool registration: src/tools/index.ts
  • Core GeoGebra tools: src/tools/geogebra-tools.ts
  • Educational templates: src/tools/educational-templates.ts
  • Performance tools: src/tools/performance-tools.ts
  • GeoGebra engine wrapper: src/utils/geogebra-instance.ts
  • Validation and errors: src/utils/validation.ts, src/utils/errors.ts
  • Tests: tests/unit, tests/e2e, tests/performance

Development Rules

  • Treat src/ as source of truth. dist/ is build output.
  • Keep MCP stdout clean: do not print non-JSON content in request/response flow.
  • Keep tool schemas explicit (type for properties) to stay Gemini-compatible.
  • Preserve backward compatibility for existing tool names and response shapes unless explicitly requested.
  • For file outputs, keep workspace path validation (no path traversal).

Tool Implementation Checklist

When adding/updating a tool:

  1. Define clear inputSchema in ToolDefinition.
  2. Validate inputs with src/utils/validation.ts (or add focused validators).
  3. Use consistent success/error payload format (content + isError when needed).
  4. Handle GeoGebra failures with actionable error text.
  5. Add/adjust tests in tests/unit and integration/e2e tests when behavior changes.

Local Commands

  • Install: npm install
  • Build: npm run build
  • Dev run: npm run dev
  • CLI run: node dist/cli.js
  • Test: npm test
  • Coverage: npm run test:coverage
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 · 47 lines · 438 tokens per session scan A 2c7828b2cd94

Subscribe to this mod's changes

geogebra-mcp-server AGENTS.md is an instructions file published in the GitHub repository YZDame/geogebra-mcp-server (2 stars, last pushed 29d ago), licensed MIT. It adds 438 tokens to every session, about $0.0018 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.

Learning and teachingcasgeogebrageometrymathmcp
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