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c4-architecture-c4-architecture

Generate comprehensive C4 architecture documentation for an existing repository/codebase using a bottom-up analysis approach.

64

1.60x
Quality

46%

Does it follow best practices?

Impact

98%

1.60x

Average score across 3 eval scenarios

SecuritybySnyk

Passed

No findings from the security scan

Fix and improve this skill with Tessl

tessl review fix ./plugins/AI-Agents-Safe-Coding-Skills/skills/c4-architecture-c4-architecture/SKILL.md

The canonical home for this skill is c4-architecture-c4-architecture in sickn33/antigravity-awesome-skills

SKILL.md
Quality
Evals
Security

Quality

Content

35%Scale 1-3

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

This skill is a comprehensive but overly verbose workflow specification that tries to embed complete subagent prompt templates inline rather than referencing them externally. While the four-phase bottom-up approach is logically sound and well-sequenced, the document suffers from excessive repetition, lack of validation checkpoints between phases, and unnecessary explanations of concepts Claude already understands (C4 model basics, what OpenAPI specs are, what personas are).

Suggestions

Extract the large subagent prompt templates into separate reference files (e.g., resources/c4-code-prompt.md, resources/c4-component-prompt.md) and reference them from the main skill, reducing the main file to a concise workflow overview.

Add explicit validation checkpoints between phases, e.g., 'Verify all subdirectories have corresponding c4-code-*.md files before proceeding to Phase 2' with a concrete verification step.

Remove the generic 'Use this skill when / Do not use this skill when' sections and the '[Extended thinking: ...]' block - these waste tokens on information Claude can infer.

Add concrete code or commands for the directory discovery step (Phase 1.1) instead of abstract instructions like 'Use codebase search to identify all subdirectories'.

DimensionReasoningScore

Conciseness

Extremely verbose at ~300+ lines. Contains extensive explanations Claude already knows (what C4 model is, what personas are, what OpenAPI specs are). The massive prompt templates embedded inline are highly repetitive, restating the same structural patterns across all four phases. The '[Extended thinking: ...]' block and generic 'Use this skill when' sections add no value.

1 / 3

Actionability

Provides structured prompts for subagents and clear output file naming conventions, which is somewhat actionable. However, the actual execution relies on Task tool calls with subagent types that aren't fully explained, there's no executable code for directory discovery/sorting, and the prompts are templates with placeholders rather than concrete executable steps.

2 / 3

Workflow Clarity

The four phases are clearly sequenced with a logical bottom-up progression, and the success criteria checklist is helpful. However, there are no validation checkpoints between phases - no step to verify Phase 1 completeness before starting Phase 2, no error recovery if a subagent fails, and no feedback loops for fixing issues in generated documentation.

2 / 3

Progressive Disclosure

References `resources/implementation-playbook.md` for detailed examples, which is good progressive disclosure. However, the massive inline prompt templates for each phase should be extracted to separate reference files. The skill tries to be both an overview and a complete implementation guide, resulting in a monolithic document.

2 / 3

Total

7

/

12

Passed

Description

57%Scale 1-3

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

The description identifies a clear and distinctive domain (C4 architecture documentation) but falls short on specificity of actions and completeness. It lacks an explicit 'Use when...' clause and doesn't enumerate the specific outputs or diagram levels it generates, which would help Claude better match user requests to this skill.

Suggestions

Add a 'Use when...' clause with trigger terms like 'architecture diagram', 'C4 model', 'system documentation', 'software architecture', 'container diagram', 'component diagram'.

List specific concrete actions such as 'Generates context, container, component, and code-level diagrams following the C4 model' to improve specificity.

Include common user phrasing variations like 'document my codebase architecture', 'create architecture diagrams', or 'visualize system structure' to improve trigger term coverage.

DimensionReasoningScore

Specificity

Names the domain (C4 architecture documentation) and the general approach (bottom-up analysis), but doesn't list specific concrete actions like generating context diagrams, container diagrams, component diagrams, or code-level diagrams.

2 / 3

Completeness

Describes what it does (generate C4 architecture documentation via bottom-up analysis) but lacks an explicit 'Use when...' clause or trigger guidance for when Claude should select this skill.

2 / 3

Trigger Term Quality

Includes some relevant keywords like 'C4 architecture', 'documentation', 'repository', 'codebase', but misses common user variations like 'architecture diagram', 'system diagram', 'C4 model', 'software architecture', or specific diagram level names.

2 / 3

Distinctiveness Conflict Risk

C4 architecture documentation is a clear, specific niche that is unlikely to conflict with other skills. The combination of 'C4', 'architecture documentation', and 'bottom-up analysis' creates a distinct identity.

3 / 3

Total

9

/

12

Passed

Validation

90%

Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.

Validation10 / 11 Passed

Validation for skill structure

CriteriaDescriptionResult

frontmatter_unknown_keys

Unknown frontmatter key(s) found; consider removing or moving to metadata

Warning

Total

10

/

11

Passed

Repository
administrakt0r/AI-Agents-Safe-Coding-Skills
Reviewed

Table of Contents

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