Pedagogical Figure Designer

For each figure, produce:

• a figure identifier;
• a short title;
• the pedagogical purpose;
• the target level;
• the chosen format;
• the source file;
• a short caption;
• a short note explaining why this figure is useful.

When relevant, also produce:

• a simplified variant;
• a detailed variant;
• an exam-safe black-and-white variant;
• an ASCII fallback for text-only environments.

When to use each format

Use PlantUML for

• UML class diagrams;
• sequence diagrams;
• state machines;
• activity diagrams;
• component and deployment views;
• lightweight software architecture views;
• protocol interactions.

Use TikZ for

• mathematically precise diagrams;
• trees, graphs, grids, and geometric or algorithmic figures in LaTeX workflows;
• figures that must integrate cleanly into lecture notes, exams, or handouts compiled with LaTeX.

Use SVG for

• architecture diagrams;
• pipelines;
• process graphs;
• memory layouts;
• block diagrams;
• reusable figures intended for slides, web pages, or later editing in a vector editor.

Use ASCII for

• terminal-only materials;
• code comments or plain-text handouts;
• quick but faithful representations of trees, pipes, process hierarchies, directory layouts, and simple flows.

Mandatory figure specification step

Before generating code, write a compact specification containing:

• figure_id
• title
• context_document
• target_level
• pedagogical_objective
• concepts_covered
• format_chosen
• why_this_format
• granularity
• must_show
• must_not_show
• caption
• accessibility_notes

If the specification is weak or ambiguous, stop and refine it before generating the figure source.

Design rules

• Prefer one pedagogical idea per figure.
• Avoid overloaded diagrams.
• Define labels and symbols explicitly.
• Avoid introducing concepts not already present in the material.
• Prefer monochrome-safe designs unless color carries essential meaning.
• Use consistent naming with the surrounding course material.
• Keep figures editable from source.
• Never produce bitmap-only figures when a source language is possible.

Quality checks

For every generated figure, verify:

• scientific correctness;
• consistency with the surrounding text;
• appropriate abstraction level;
• readability at normal print or slide scale;
• no hidden ambiguity in labels or arrows;
• no unnecessary decorative elements.

Typical use cases

• add a process/thread memory model figure to an OS lecture;
• generate a PlantUML sequence diagram for a client-server TP;
• produce a TikZ graph traversal figure for an algorithms exam;
• generate an ASCII pipeline diagram for a Unix shell exercise;
• create an SVG architecture view for a fil rouge project.

Deliverables

When asked to support an existing pedagogical artifact, generate:

1. figures/figure-index.md with the list of recommended or produced figures;
2. figures/specs/ containing one specification file per figure;
3. figures/src/ containing source files in .svg, .tex, .puml, or .txt;
4. optional figures/captions.md for reusable captions.