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Java Diagrams Generator with modular step-based configuration · jabrena | DecimalAI

documentationby jabrena

Java Diagrams Generator with modular step-based configuration

jabrena/033-architecture-diagrams

Source jabrena/plinth ↗License Apache-2.0

Use when you need to generate Java project diagrams — including UML sequence diagrams, UML class diagrams, C4 model diagrams, UML state machine diagrams, UML Deployment Diagrams, ER (Entity Relationship) diagrams, and bounded-context diagrams — through a modular, step-based interactive process that adapts to your specific visualization needs. This should trigger for requests such as Generate UML diagram; Create sequence diagram; Create class diagram; Create state machine diagram; Create deployme

SkillScore88Maintained

Automatic

Coding pack

Last verified 8/20/2026

What it changes

Passed 20 of 23 test cases with the skill, and 9 of 23 without it.

Without skill40%

With skill88%

Checks it passed that the model alone missed

Asks Question 2 regarding sequence diagram types
Selects references/033-architecture-diagrams-c4.md
Asks Question 6 regarding state-machine diagram types

and 9 more in the full report

12 fixed10 passed either way3 still failing0 broke

Pass-rate lift: +48 pp
Tokens: +142%
Agent turns: 0%
Response time: -49%

Model gemini-3.6-flashMeasured 8/20/2026v122 of 25 cases passed with skill · 23 comparable

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/jabrena-033-architecture-diagrams/SKILL.md https://app.decimal.ai/s/jabrena-033-architecture-diagrams/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add jabrena-033-architecture-diagrams, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/jabrena-033-architecture-diagrams/ and pins it in .decimal/skills.lock

decimalai skills add jabrena-033-architecture-diagrams

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/jabrena-033-architecture-diagrams/SKILL.md https://app.decimal.ai/s/jabrena-033-architecture-diagrams/SKILL.md

Raw file: /s/jabrena-033-architecture-diagrams/SKILL.md ↗ · machine-readable summary at /s/jabrena-033-architecture-diagrams.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 12 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 12

Prompt

We have created several .puml files in the diagrams directory. What exact local command flag should be passed to PlantUML to perform syntax verification without rendering images?

What was checked, without and with the skill
Checked	Without skill	With skill
Specifies the -checkonly flag for PlantUML syntax validation	Missed	Passed

case-08 · gemini-3.6-flash · 8/20/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md266 lines8 files

Java Diagrams Generator with modular step-based configuration

Generate comprehensive Java project diagrams through a modular, step-based interactive process that covers UML sequence diagrams, UML class diagrams, C4 model diagrams, UML state machine diagrams, UML Deployment Diagrams, ER (Entity Relationship) diagrams, and bounded-context diagrams using PlantUML syntax. This is an interactive SKILL.

What is covered in this Skill?

UML sequence diagram generation for application workflows and API interactions
UML class diagram generation for package structure and class relationships
C4 model diagram generation for Context, Container, and Component diagrams
UML state machine diagram generation for entity lifecycles and business workflows
UML Deployment Diagram generation for runtime topology, nodes, execution environments, deployed components, data stores, queues, external systems, and communication paths
ER diagram generation from SQL schema (DDL, migrations) using PlantUML Chen notation
Bounded-context diagram generation for DDD context maps across one or more repositories
PlantUML syntax for all diagram types
File organization strategies: single-file, separate-files, or integrated with existing documentation
Final diagram validation with PlantUML syntax checking
PlantUML validation and PNG/SVG rendering with a trusted local PlantUML installation or repository-approved wrapper

Constraints

Before applying any diagram generation, ensure the project validates. If validation fails, stop immediately — do not proceed until all validation errors are resolved.

MANDATORY: Run ./mvnw validate or mvn validate before applying any diagram generation
SAFETY: If validation fails, stop immediately — do not proceed until all validation errors are resolved
BEFORE READING DIAGRAM REFERENCES: Run the question flow embedded in this SKILL.md first. Ask the diagram preference questions one by one, collect selected diagram families and output preferences, then read only the implementation references selected by the user's answers
C4 SCOPE: C4 diagrams are restricted to Context, Container, and Component diagrams
SUPPLY CHAIN: Generated PlantUML diagrams must use trusted local includes only; do not use remote !include URLs for C4 or icon libraries
TOOLING SAFETY: Use only trusted local PlantUML tooling or a repository-approved wrapper; do not pull or run remote container images as part of this skill

When to use this skill

Generate UML diagram
Create sequence diagram
Create class diagram
Create state machine diagram
Create deployment diagram
Create C4 diagram
Generate ER diagram
Create bounded-context diagram
Create context-map diagram

Track record

Benchmark

20 / 23

test cases passed, vs 9 / 23 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

jabrena / plinth

skills/033-architecture-diagrams/SKILL.md

View on GitHub ↗

License Apache-2.0Imported 10/2/2026Version v1Bundled 7 files

More skills from the same source and nearby in the registry, with their headline benchmark lift.

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See it in action

What's inside

Java Diagrams Generator with modular step-based configuration

Constraints

When to use this skill

Track record

Benchmark

Adoption

SkillSafety

Source

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