Three-Part Lesson Designer (Montessori) Agent Skill

Design a Montessori three-period lesson for introducing concepts through concrete materials and naming.

Context cost
6.3k tokensestimated from the bundle, loaded when it triggers
Bundle
1 file · 25.2 kBtext throughout, nothing executable
Licence
not declarednone named by its author
Last change
—v1.0
Servers it uses
Noneruns standalone

What it does

Design a Montessori three-period lesson for introducing concepts through concrete materials and naming. Use when teaching vocabulary, classifications, or concepts through hands-on materials.

What this skill changes about the agent has not been set out here as a list. Its SKILL.md, shown below, says it in the author’s own words.

classificationlillardmontessorinamingrecallrecognitionthree-period-lessonvocabulary

The skill itself

A skill is instructions the model reads, so you can see what you are getting: below is the start of its SKILL.md. The front matter loads with every session, the body loads when the skill triggers, and the whole file comes with the install.

SKILL.md25.2 kB · preview
--- # AGENT SKILLS STANDARD FIELDS (v2) name: three-part-lesson-designer disable-model-invocation: false user-invocable: true effort: medium # EXISTING FIELDS skill_id: "montessori-alternative-approaches/three-part-lesson-designer" skill_name: "Three-Part Lesson Designer (Montessori)" domain: "montessori-alternative-approaches" version: "1.0" evidence_strength: "moderate" evidence_sources: - "Lillard & Else-Quest (2006) — Evaluating Montessori education (Science, 313, 1893-1894)" - "Lillard (2012) — Preschool children's development in classic Montessori, supplemented Montessori, and conventional programs" - "Lillard (2005) — Montessori: The Science Behind the Genius" - "Séguin (1866) — Idiocy: and its treatment by the physiological method (origin of the three-period lesson)" - "Standing (1957) — Maria Montessori: Her Life and Work (detailed description of three-period lesson)" input_schema: required: - field: "concept_to_teach" type: "string" - field: "concrete_materials" type: "string" optional: - field: "student_level" type: "string" - field: "subject_area" type: "string" - field: "group_size" type: "string" - field: "prior_knowledge" type: "string" - field: "language_considerations" type: "string" output_schema: type: "object" fields: - field: "three_period_lesson" type: "object" - field: "materials_preparation" type: "object" - field: "assessment_indicators" type: "object" - field: "extension_activities" type: "array" chains_well_with: - "prepared-environment-designer" - "mixed-age-learning-task-designer" - "uninterrupted-work-cycle-designer" - "retrieval-practice-designer" teacher_time: "3 minutes" tags: ["Montessori", "three-period-lesson", "Lillard", "naming", "recognition", "recall", "vocabulary", "classification", "concrete"] ---
70# Three-Part Lesson Designer (Montessori)
71
72## What This Skill Does
73
74Designs a Montessori three-period lesson (also called the three-stage lesson or three-part lesson) — the most encodable and most studied Montessori instructional practice. The three-period lesson was originally developed by Édouard Séguin (1866) and adapted by Maria Montessori for use with concrete materials. It consists of three distinct phases: Period 1 (Introduction/Naming) — the teacher names the concept while the student handles the material: "This is an isosceles triangle"; Period 2 (Recognition) — the teacher asks the student to identify the concept from among options: "Show me the isosceles triangle"; Period 3 (Recall) — the teacher asks the student to name the concept from memory: "What is this called?" The sequence is deliberately ordered because naming (Period 1) requires only passive reception, recognition (Period 2) requires matching a name to an object, and recall (Period 3) requires active retrieval from memory — each period demands more cognitive work than the last. Lillard et al. (2006) published in Science demonstrating that children in Montessori programmes showed significant advantages in academic and social outcomes, and the three-period lesson is one of the specific instructional practices that characterises high-fidelity Montessori implementation. This skill designs the complete lesson, including materials preparation, the specific language for each period, assessment indicators, and extensions.
75
76## Evidence Foundation
77
78Lillard & Else-Quest (2006) published a landmark study in Science comparing outcomes for children in a Montessori school with matched controls in other school types. Montessori children showed significantly better performance on standardised reading and maths tests, and also demonstrated superior executive function, social problem-solving, and sense of community. While the study evaluated the Montessori programme as a whole (not individual practices in isolation), the three-period lesson is identified in Montessori literature (Lillard, 2005; Standing, 1957) as one of the foundational instructional practices that distinguishes high-fidelity Montessori from conventional instruction. Lillard (2012) followed up with a study comparing "classic" Montessori (high fidelity, including consistent use of three-period lessons with concrete materials) with "supplemented" Montessori (Montessori materials plus conventional activities) and conventional programmes. Classic Montessori children outperformed both other groups on several measures, suggesting that the specific Montessori practices — including the three-period lesson — contribute to the overall programme effect, rather than the effect being attributable to selection bias or general school quality alone. Lillard (2005) in "Montessori: The Science Behind the Genius" analysed the three-period lesson through the lens of cognitive science, noting that it aligns with several evidence-based principles: it begins with concrete, sensory experience (embodied cognition), it isolates the concept to be learned (reducing cognitive load), it uses active retrieval in Period 3 (the testing effect), and it requires mastery of each period before advancing (mastery learning). The three-period lesson structure also maps directly onto the cognitive science distinction between recognition memory (easier, Period 2) and recall memory (harder, Period 3) — a distinction well-established in memory research since at least Anderson & Bower (1972). Séguin (1866) originally designed the three-period approach for teaching classification and vocabulary to children with intellectual disabilities, demonstrating that the structured sequence from naming through recognition to recall was effective even for learners with significant cognitive challenges — evidence of the method's robustness.
79
80## Input Schema
81
82The teacher must provide:
83- **Concept to teach:** What students will learn to name, recognise, and recall. *e.g. "Three types of triangle: equilateral, isosceles, and scalene" / "The parts of a flower: petal, stamen, pistil, sepal" / "Three states of matter: solid, liquid, gas" / "Geometric solids: cube, sphere, cylinder, cone" / "Musical note values: crotchet, minim, semibreve"*
84- **Concrete materials:** What students will handle. *e.g. "Three wooden triangles from the geometry cabinet — one of each type, painted blue on one side" / "A real flower dissected and mounted on a green felt mat" / "Three containers: a block of wood, a glass of water, a balloon filled with air" / "Wooden geometric solids from the Montessori maths shelf"*
85
86Optional (injected by context engine if available):
87- **Student level:** Age/year group and developmental stage
88- **Subject area:** The curriculum subject
This is a preview of SKILL.md. Download or install the skill to get the whole thing.
In the file
SKILL.md3,679 words
Files1
Licencenot declared
Why you can read it

Nothing in a skill executes. The client loads the text and the model follows it, so a skill can be audited the way a runbook is — by reading it.

What it costs in context

Skills are not billed by the call. They are paid for in context: every token the instructions occupy is a token your code, your diff and your conversation cannot use. Here is what this one takes and when it takes it.

≈810
always loaded
The name and description, so the model knows the skill exists and when to reach for it.
5,490
on trigger
The instruction body, read only when the skill fires.
3.1%
of a 200k window
Ten skills this size would take about 32% of the window before you open a file.
050k100k150k200k context window

6.3k tokens, estimated from the bundle at four bytes to the token, held for the rest of the session once it triggers. Heavy. Teams tend to install this one per project rather than globally, and load it only when the job comes up.

Servers bill, skills cost

A server charges by the month. A skill charges once per session, in context, and then keeps charging it for as long as the session lives.

Before and after

The same question, put to the same model twice: once as it comes, and once with these instructions loaded.

No worked example has been published for this skill yet.

The procedure it runs

The procedure has not been set out here step by step. It is in the body of its SKILL.md: the start of it is shown above, and the whole file comes with the install.

Prose, not code

These steps are written for a model to follow, not executed by a runtime. It can still be told to skip one, and it will say so when it does.

Servers it uses

None. This skill calls no MCP servers at all.

Everything it needs is in the instructions, so it works in a project with nothing connected — the model reads the file and changes how it works with what it can already reach.

Its SKILL.md does not declare which tools it asks the agent for, so what it touches is whatever the instructions themselves ask for — read them before you install it.

What it asks for
Writes filesnot declared
Network accessnot declared

This SKILL.md carries no allowed-tools line, so neither is declared. A skill grants no permissions of its own — it can only ask for tools your client already has.

What it will not do

Every skill is narrow, and the useful ones say where they stop. These are the jobs this one is the wrong tool for.

What this skill is not for has not been published here. Nothing is implied by that: it is a section the author has not filled in.

What is in the bundle

1 file, 25.2 kB on disk. A bundle is text throughout: the instructions the model reads, plus the templates it fills in.

  • SKILL.md25.2 kB
What is not in it

No dependencies and nothing executable: a skill is text the agent reads, so the bundle is 1 file you can review in full before installing.

Install

Installing copies the bundle into your project. Nothing runs at install time — the files sit on disk until the model reads them.

# Three-Part Lesson Designer (Montessori) · 6.3k tokens when loaded · macOS, Linux mkdir -p .claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/three-part-lesson-designer-montessori/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/three-part-lesson-designer-montessori" ] && { [ ! -e .claude/skills/three-part-lesson-designer-montessori ] || { mv .claude/skills/three-part-lesson-designer-montessori "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/three-part-lesson-designer-montessori" .claude/skills/ && echo "Installed .claude/skills/three-part-lesson-designer-montessori"
On Windows, or any OS with Node 20+
npx mcprush@latest skill add garethmanning/three-part-lesson-designer-montessori

Windows PowerShell says 'running scripts is disabled on this system'? Run Set-ExecutionPolicy -Scope CurrentUser RemoteSigned once, or type npx.cmd instead of npx (codex.cmd, gemini.cmd, grok.cmd likewise). PowerShell 7 needs neither. Writes to .claude/skills/three-part-lesson-designer-montessori/ in the current project. For every project instead, run mkdir -p ~/.claude/skills && t=$(mktemp -d) && curl -fsSL -o "$t/bundle.tar.gz" https://mcprush.com/api/skills/three-part-lesson-designer-montessori/bundle.tar.gz && tar -xzf "$t/bundle.tar.gz" -C "$t" && [ -d "$t/three-part-lesson-designer-montessori" ] && { [ ! -e ~/.claude/skills/three-part-lesson-designer-montessori ] || { mv ~/.claude/skills/three-part-lesson-designer-montessori "$t/.previous" && echo "Previous copy moved to $t/.previous"; }; } && mv "$t/three-part-lesson-designer-montessori" ~/.claude/skills/ && echo "Installed ~/.claude/skills/three-part-lesson-designer-montessori" (macOS, Linux) — or add --global to the npx line. The curl line replaces .claude/skills/three-part-lesson-designer-montessori/ only after the download succeeds, so files left there by another skill of the same name, or by an older release, do not mix in. A copy already there is moved aside, not deleted, and the line prints where. It appears as three-part-lesson-designer in Gemini CLI, Codex, Copilot and Grok (its own name); Claude Code lists it by the folder name, three-part-lesson-designer-montessori.

Which clients pick it up on their own

A skill is a folder of text. Most of these read a skills folder and pick it up without being told; the rest take the same folder another way — an upload in the app, a parameter on an API call — and then choose it by its description just the same.

Claude Code.claude/skills/
Claude DesktopCustomize › Skills
ChatGPTSkills › Create › Upload
Cursor.cursor/skills/
VS Code.github/skills/
Codex CLI.agents/skills/
Gemini CLI.gemini/skills/
Grok Build.grok/skills/
Microsoft CopilotSkills › Upload a skill
PerplexityComputer › Skills › Upload a skill
DeepSeek Harness.dsh/skills/
Zed.agents/skills/
Devin Desktop.devin/skills/
Windsurf (legacy).windsurf/skills/
OpenAI Agents SDKInstructions or sandbox Skills
HTTP / APIa request parameter
This release
Version1.0
Publishedno release date on file
PriceFree
Referencegarethmanning/three-part-lesson-designer-montessori

Versions

v1.0 is what is on the shelf; no release here carries a date. Instructions change more often than APIs do — a skill can be rewritten entirely without anything it depends on moving.

v1.0
  • No earlier releases have been published to the marketplace.
Pinning

The install command always fetches the release that is current the day you run it — v1.0 today — and cannot ask for an earlier one. The copy on your disk does not change until you run it again.

Reviews

—no reviews yet

Nobody has reviewed this skill yet. The rating is the mean of the reviews written here, so there is none until somebody writes the first.

Sign in to review it

A review is tied to an account so it can be answered, edited and taken down by the person who wrote it.

Sign in
Who can post

Anybody with an account, one review each. It carries the version that was current when you wrote it, and the publisher may reply once.

Publisher
Servers0
Claim this skill