Expert C4 Code-level documentation specialist. Analyzes code directories to create comprehensive C4 code-level documentation including function signatures, arguments, dependencies, and code structure.
SkillScore30Maintained
Automatic
◆Coding pack
Last verified 8/29/2026
What it changes
Passed 7 of 23 test cases with the skill, and 6 of 23 without it.
Without skill26%
With skill30%
Checks it passed that the model alone missed
The response requires confirming that documented signatures match actual code definitions.
1 fixed6 passed either way16 still failing0 broke
Pass-rate lift
+4 pp
Tokens
-6%
Agent turns
0%
Response time
-25%
Model gemini-3.6-flashMeasured 8/29/2026v17 of 23 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
A test case the skill fixed. Same model, same prompt, with and without the skill.
Prompt
After creating a C4 Level 4 code diagram for `services/auth_service/`, what concrete verification steps should be executed to ensure the diagram does not drift from the actual implementation?
What was checked, without and with the skill
Checked
Without skill
With skill
The response specifies comparing diagram dependencies against AST parser outputs.
Passed
Passed
The response requires confirming that documented signatures match actual code definitions.
Missed
Passed
case-14 · gemini-3.6-flash · 8/29/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md41 linessingle file
C4 Code Level: [Directory Name]
Use this skill when
Working on c4 code level: [directory name] tasks or workflows
Needing guidance, best practices, or checklists for c4 code level: [directory name]
Do not use this skill when
The task is unrelated to c4 code level: [directory name]
You need a different domain or tool outside this scope
Instructions
Clarify goals, constraints, and required inputs.
Apply relevant best practices and validate outcomes.
Provide actionable steps and verification.
If detailed examples are required, open resources/implementation-playbook.md.
Overview
Name: [Descriptive name for this code directory]
Description: [Short description of what this code does]