Borrowing it
Nothing to install: this file belongs to jacob-dietle/context-os. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/jacob-dietle/context-os/main/.claude/skills/context-gap-analysis/SKILL.mdgit clone --depth 1 https://github.com/jacob-dietle/context-osWrote 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/jacob-dietle/context-os/context-gap-analysis)<a href="https://agentmods.dev/skills/jacob-dietle/context-os/context-gap-analysis"><img src="https://agentmods.dev/badge/skills/jacob-dietle/context-os/context-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/jacob-dietle/context-os/context-gap-analysis"><img src="https://agentmods.dev/badge/skills/jacob-dietle/context-os/context-gap-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00037 | $0.02455 |
| Opus 5.5 | $0.00015 | $0.00982 |
| Sonnet 5.5 | $0.00007 | $0.00491 |
| Haiku 4.5 | $0.00004 | $0.00246 |
Grade A, and why
context-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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 320 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Context Gap Analysis
Systematic methodology for checking what you need, what exists, and finding the simplest path forward.
Core Principle: "What if it's already done? Check before you build."
Why This Matters
90% of Claude Code "hallucinations" happen because the agent doesn't have the context it needs. This skill forces a context check before any implementation, preventing wasted effort and wrong assumptions.
When to Use This Skill
ALWAYS use before:
- Starting any implementation
- Planning any feature
- Proposing any solution
Do NOT skip for:
- "Simple" tasks (often already implemented)
- "Obvious" implementations (often exist in codebase)
- Time pressure (30 seconds now saves hours later)
The Solution Hierarchy
Check these in order - most tasks don't need new work:
For Code Tasks
1. ALREADY DONE - Feature exists, just needs config
2. SCAFFOLDED - Structure exists, needs small completion
3. SIMILAR EXISTS - Related feature can be extended
4. PATTERN EXISTS - Codebase has pattern to follow
5. NEW BUILD - Must create from scratch (rare!)
For GTM/Knowledge Tasks
1. ALREADY DONE - Synthesis doc answers the question
2. CONTEXT EXISTS - 80% of needed info is in existing docs
3. SIMILAR EXISTS - Related battlecard/persona/content to adapt
4. TEMPLATE EXISTS - Framework or template to follow
5. TRUE GAP - Need new research or content (rare!)
Reality check: ~40% of tasks are "already done" - the context already exists somewhere in your system.
The Context Gap Protocol
Step 1: Enumerate What You Need (30 seconds)
Before searching, list your context requirements:
## Context Requirements for: [TASK]
### Must Know (Blocking)
- [ ] Does this feature already exist?
- [ ] What's the current implementation status?
- [ ] What configuration is needed?
### Should Know (Important)
- [ ] What patterns does codebase use for this?
- [ ] What external APIs are involved?
### User Clarification Needed
- [ ] Any preferences not captured in code?
- [ ] Success criteria undefined?
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.
- 2mo ago First seen · 320 lines · 37 tokens per session scan A 8aec4698f11b
context-gap-analysis is a skill published in the GitHub repository jacob-dietle/context-os (115 stars, last pushed 2mo ago), licensed MIT. It adds 37 tokens to every session and 2,455 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 2026-08-30.
context-gap-analysis compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| context-gap-analysisjacob-dietle/context-os | Skill | 115 | 2mo ago | MIT | A | 37 | Claude Code |
| imagegenopenai/codex | Skill | 133k | yesterday | Apache-2.0 | A | 113 | Codex |
| playwright-climicrosoft/playwright | Skill | 99k | yesterday | Apache-2.0 | A | 19 | Claude Code |
| local-ai-agentsmicrosoft/ai-agents-for-beginners | Skill | 79k | 4d ago | MIT | A | 200 | Claude Code, Codex |
| systematic-debuggingobra/superpowers | Skill | 313k | 3d ago | MIT | A | 21 | Claude Code |
| next-cache-components-adoptionvercel/next.js | Skill | 143k | today | MIT | A | 95 | Claude Code |
| next-partial-prefetching-adoptionvercel/next.js | Skill | 143k | today | MIT | A | 103 | Claude Code |