# Equation.io (slim)

> Equation.io, an MCP server by equation.io, listed from the official MCP registry. Indexed, not reviewed: facts and our own checks, no score or ranking. Create interactive 2D and 3D graphs with validated equations, shareable links, and PNG previews.

- Full: https://www.anchorterminal.com/tools/equation.md (~650 tokens) · this version ~580 tokens · JSON https://www.anchorterminal.com/tools/equation.json · canonical https://www.anchorterminal.com/tools/equation
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-05

# Equation.io

> Indexed, not reviewed: facts from the official MCP registry and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/

- Kind: MCP server, by equation.io (https://equation.io)
- Listed because: It's published in the registry under equation.io, a namespace the registry only gives to whoever proves they control that domain. It's in real use: 406 GitHub stars.
- What the official MCP registry says: Create interactive 2D and 3D graphs with validated equations, shareable links, and PNG previews.

## Facts

- MCP registry: `io.equation/equation` 1.0.1
- Endpoint: https://equation.io/mcp (streamable HTTP)
- Source: https://github.com/aantthony/equation.io
- Website: https://equation.io
- GitHub stars: 406
- Registry entry updated: 2026-10-02

## Tools

- Tools it lists (3, about 1,559 tokens of context, `tools/list` without credentials, checked 2026-10-04 22:25 UTC):
  - `encode_graph_url` (read-only): Build an equation.io graph link, validating every row with the app's parser. Pass the COMPLETE graph in "equations": a flat array of strings, one equation or…
  - `decode_graph_url` (read-only): Decode an equation.io link (either the #-fragment form or the /g/ share form) into its list of equation rows, so you can edit them and build a new link with…
  - `show_graph` (read-only): Display an interactive equation.io graph inside the conversation, with editable equations, sliders, pan/zoom, and 3D rotation. Use when the user asks to see or…
- How its tools read to an agent (0 errors, 0 warnings, 0 notes, about 1,559 tokens; rules at https://www.anchorterminal.com/check.md; not part of the score):

- JSON: https://www.anchorterminal.com/api/v1/tools/equation.json
- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming