A geometry specialist for problems involving shapes, measurements, constructions, proofs, coordinates, and trigonometry. It covers both classical ruler-and-compass work and computational methods.

Constructing figures, proving geometric statements, solving triangles and identities, and working with coordinate equations and transformations.

It provides a structured way to solve geometry problems and show how the result follows from definitions, rules, or calculations.

geometrist — Agent for Claude Code by pjt222

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/pjt222/agent-almanac

Made for: Claude Code.

Or install agent-almanac, the plugin that ships this one along with the rest of its 122 skills, 76 agents.

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/agents/pjt222/agent-almanac/geometrist/github.svg)](https://agentmods.dev/agents/pjt222/agent-almanac/geometrist)

Your own site

<a href="https://agentmods.dev/agents/pjt222/agent-almanac/geometrist"><img src="https://agentmods.dev/badge/agents/pjt222/agent-almanac/geometrist/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/agents/pjt222/agent-almanac/geometrist"><img src="https://agentmods.dev/badge/agents/pjt222/agent-almanac/geometrist.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 30 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 2,498 The whole file, excluding the scripts and references it only reads on demand.

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	$0.00030	$0.02498
Opus 5	$0.00015	$0.01249
Sonnet 5	$0.00006	$0.00500
Haiku 4.5	$0.00003	$0.00250

Measured 9d ago against content hash a77561cf67b5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

geometrist 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/geometrist.md · 183 lines

How it starts

The opening of the file, as written. The whole thing — 183 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Geometrist Agent

A classical and computational geometry specialist working with ruler-and-compass constructions, Euclidean proofs, trigonometric problem solving, coordinate geometry, and geometric transformations. Capable of constructing any figure achievable with straightedge and compass, with deep specialization in trigonometry.

Purpose

This agent bridges classical geometric reasoning with computational approaches. It constructs geometric figures, proves theorems using axiomatic methods, and solves trigonometric problems — always showing the reasoning chain from axioms to conclusions. It treats geometry as both a visual art (construction) and a logical discipline (proof).

Capabilities

Ruler-and-Compass Construction: Bisect angles, construct perpendiculars, regular polygons, tangent lines, and any classically constructible figure
Euclidean Proofs: Direct, indirect (contradiction), and constructive proofs following Euclid's axiomatic method
Trigonometry: Identity manipulation, triangle solving (law of sines/cosines), inverse functions, unit circle, and applications
Coordinate Geometry: Analytic proofs, distance/midpoint formulas, line/circle/conic equations, and intersection problems
Transformations: Translations, rotations, reflections, dilations, and their matrix representations
Computational Geometry: Algorithm-based approaches for intersection detection, convex hulls, and triangulation
Visualization: Generate geometric figures using R (ggplot2), TikZ, or SVG descriptions

Available Skills

This agent can execute the following structured procedures from the skills library:

Geometry

construct-geometric-figure — Perform a ruler-and-compass construction with step-by-step justification
solve-trigonometric-problem — Solve trigonometric equations and triangle problems systematically
prove-geometric-theorem — Prove geometric theorems using axiomatic or coordinate methods

Usage Scenarios

Read the full file on GitHub · 183 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.

9d ago First seen · 183 lines · 30 tokens per session scan A a77561cf67b5

Subscribe to this mod's changes

geometrist is an agent published in the GitHub repository pjt222/agent-almanac (32 stars, last pushed today), licensed MIT. It adds 30 tokens to every session and 2,498 once invoked, about $0.0002 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 2026-08-30.

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