c4-architecture-c4-architecture

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

Quality

38%

Does it follow best practices?

Impact

—

No eval scenarios have been run

Securityby

Passed

No known issues

Optimize this skill with Tessl

npx tessl skill review --optimize ./.agent/skills/c4-architecture-c4-architecture/SKILL.md

Quality

Content

20%

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

This skill is essentially a table of contents that delegates all substantive content to sub-skill files while padding the main file with generic, non-actionable instructions and unnecessary explanations. The SKILL.md itself provides almost no executable guidance—no commands, no code, no templates, no concrete examples of what the output documentation should look like. While the high-level workflow structure is reasonable, the lack of any actionable content in the main file makes it ineffective as a standalone skill.

Suggestions

Add concrete, executable examples: include at least one sample command or code snippet showing how to discover subdirectories, and a template showing what a code-level documentation file should look like.

Remove generic filler content: eliminate the 'Use this skill when/Do not use this skill when' sections, the extended thinking block, and vague instructions like 'Clarify goals, constraints, and required inputs' that waste tokens without adding value.

Add validation checkpoints to the workflow: after each phase, specify how to verify the output is correct (e.g., 'Verify all subdirectories have corresponding .md files in C4-Documentation/code/', 'Check that every code-level doc is referenced by exactly one component doc').

Provide brief descriptions next to each sub-skill link explaining what it does and what it produces, so the reader can understand the workflow without clicking through every link.

Dimension	Reasoning	Score
Conciseness	Contains significant unnecessary content: the extended thinking block explaining what the workflow does, redundant 'Use this skill when/Do not use this skill when' sections that add no value, generic instructions ('Clarify goals, constraints, and required inputs') that Claude already knows, and explanations of the C4 model that are basic knowledge. The actual actionable content is minimal relative to the total token count.	1 / 3
Actionability	The skill provides no concrete, executable guidance. There are no code examples, no specific commands, no file templates, and no actual instructions for how to perform any of the steps. Everything is delegated to sub-skill files via links, and the generic instructions ('Apply relevant best practices and validate outcomes') are vague platitudes rather than actionable steps.	1 / 3
Workflow Clarity	The four phases (Code, Component, Container, Context) are clearly sequenced and the bottom-up approach is explained. However, there are no validation checkpoints, no error recovery steps, no feedback loops for verifying documentation quality, and the numbered sub-skills list doesn't clearly indicate dependencies or sequencing beyond the numbering scheme.	2 / 3
Progressive Disclosure	The skill does reference 9 sub-skill files with clear one-level-deep links, which is good structure. However, since no bundle files are provided, we cannot verify these references exist. The overview section is reasonable but the 'Knowledge Modules' section is just a flat list of links without descriptions of what each sub-skill covers, making navigation harder. The reference to 'resources/implementation-playbook.md' is also unverifiable.	2 / 3
	Total	6 / 12 Passed

Description

57%

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 niche (C4 architecture documentation) but lacks explicit trigger guidance ('Use when...') and could benefit from listing more specific actions and natural user keywords. It is functional but not optimally discoverable among a large set of skills.

Suggestions

Add an explicit 'Use when...' clause, e.g., 'Use when the user asks for architecture diagrams, C4 models, system documentation, or wants to visualize the structure of a codebase.'

List specific concrete actions such as 'generates context diagrams, container diagrams, component diagrams, and code-level documentation from source code analysis.'

Include additional natural trigger terms users might say, such as 'architecture diagram', 'C4 model', 'system overview', 'software architecture', 'PlantUML', or 'Structurizr'.

Dimension	Reasoning	Score
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	Answers 'what' (generate C4 architecture documentation using bottom-up analysis) but lacks an explicit 'Use when...' clause or equivalent trigger guidance, capping this at 2 per the rubric guidelines.	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 fairly distinct niche that is unlikely to conflict with other skills. The combination of 'C4', 'architecture documentation', and 'bottom-up analysis' creates a clear, specific identity.	3 / 3
	Total	9 / 12 Passed

Validation

90%

Warnings & errors only

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

Validation — 10 / 11 Passed

Validation for skill structure

Criteria	Description	Result
frontmatter_unknown_keys	Unknown frontmatter key(s) found; consider removing or moving to metadata	Warning

	Total	10 / 11 Passed

Repository: Dokhacgiakhoa/antigravity-ide
Commit: c4a059b

Reviewed: 5 days ago

Table of Contents

Discovery Implementation Validation

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