Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add JakubMikolajek/codex-skills-collection --skill implementation-gap-analysisgit clone --depth 1 https://github.com/JakubMikolajek/codex-skills-collectionWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/jakubmikolajek/codex-skills-collection/implementation-gap-analysis)<a href="https://agentmods.dev/skills/jakubmikolajek/codex-skills-collection/implementation-gap-analysis"><img src="https://agentmods.dev/badge/skills/jakubmikolajek/codex-skills-collection/implementation-gap-analysis/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/jakubmikolajek/codex-skills-collection/implementation-gap-analysis"><img src="https://agentmods.dev/badge/skills/jakubmikolajek/codex-skills-collection/implementation-gap-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00026 | $0.00324 |
| Opus 5.5 | $0.00010 | $0.00130 |
| Sonnet 5.5 | $0.00005 | $0.00065 |
| Haiku 4.5 | $0.00003 | $0.00032 |
Grade A, and why
implementation-gap-analysis scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Implementation Gap Analysis
This skill helps compare the current state of the system to expected changes. It validates what has to be implemented, what was already implemented and what has to be modified in order to deliver the feature.
Implementation Gap Analysis Process
Use the checklist below and track your progress:
Analysis progress:
- [ ] Step 1: Analyse all available information about the task
- [ ] Step 2: Analyse the current system state
- [ ] Step 3: Compare the expected result to the current system
- [ ] Step 4: Prepare the report
Step 1: Analyse all available information about the task
Check the conversation history and .research.md files to fully understand the goal of the task. Make sure to deeply understand what we want to implement.
Step 2: Analyse the current system state
Go through the current codebase and look for items that are related to the current task.
Step 3: Compare the expected result to the current system
Based on the current code and task information, verify which part have to be created from scratch, which have to be modified and which can be re-used as they are.
Step 4: Prepare the report
Prepare an analysis report following the ./references/implementation-gap-analysis.example.md template.
Don't add or remove any sections from the template. Follow the structure and naming conventions strictly to ensure clarity and consistency.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 39 lines · 26 tokens per session scan A 2b3276a40c79
implementation-gap-analysis is a skill published in the GitHub repository JakubMikolajek/codex-skills-collection (6 stars, last pushed 19d ago), licensed MIT. It adds 26 tokens to every session and 324 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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