gap-check

gap-check is a skill for Claude Code, Codex from sideshowroberto/vfx-agent-toolkit. It costs 58 tokens per session (642 once invoked), scanned A, original, MIT.

Audits Claude's own knowledge gaps against a settled plan before building - sorts confident from guessed, researches public gaps, and lists unknowns for the user. Use after /grill-me, before a build session, or on 'gap-check' or 'check your assumptions'.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Install with agentmods
npx agentmods add skills/sideshowroberto/vfx-agent-toolkit/gap-check
Install

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.

Any agent
npx skills add sideshowroberto/vfx-agent-toolkit --skill gap-check
Clone the repo
git clone --depth 1 https://github.com/sideshowroberto/vfx-agent-toolkit

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for gap-check

README.md
[![agentmods](https://agentmods.dev/badge/skills/sideshowroberto/vfx-agent-toolkit/gap-check/github.svg)](https://agentmods.dev/skills/sideshowroberto/vfx-agent-toolkit/gap-check)
Your own site
<a href="https://agentmods.dev/skills/sideshowroberto/vfx-agent-toolkit/gap-check"><img src="https://agentmods.dev/badge/skills/sideshowroberto/vfx-agent-toolkit/gap-check/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.

agentmods 80×15 button for gap-check

Your own site · 80×15
<a href="https://agentmods.dev/skills/sideshowroberto/vfx-agent-toolkit/gap-check"><img src="https://agentmods.dev/badge/skills/sideshowroberto/vfx-agent-toolkit/gap-check.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 58 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 642 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00058 $0.00642
Opus 5.5 $0.00023 $0.00257
Sonnet 5.5 $0.00012 $0.00128
Haiku 4.5 $0.00006 $0.00064

Measured today against content hash 0ee96658fabb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

gap-check 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 today.

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.

plugins/vfx-core/skills/gap-check/SKILL.md · 63 lines

How it starts

The opening of the file, as written. The whole thing — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are about to audit your own knowledge against the current plan. The goal is to surface silent assumptions and fill gaps with research BEFORE planning or building begins.

Step 1 - State the plan

In one sentence, restate the settled scope from the current conversation so the user can confirm it's correct before proceeding.

Step 2 - Self-audit

Go through every technical component of the plan. For each, honestly categorize your knowledge:

[OK] Confident - You have seen this documented or used it correctly in verified contexts. State your source if possible.

~ Uncertain - You know the general shape but are fuzzy on specifics, version details, or edge cases. State what you're unsure about.

[FAIL] Guessing - You are inferring from related knowledge or pattern-matching. You could be wrong. State the assumption explicitly.

Be ruthless. The most common failure mode is treating ~ and [FAIL] items as [OK]. If you haven't verified it recently or it's version-sensitive, it's not [OK].

Step 3 - Classify gaps by who can fill them

After the audit, sort the ~ and [FAIL] items into three buckets:

Search-specialist can answer - Public API docs, version changelogs, GitHub issues, library behavior. Launch a search-specialist agent for each cluster of related questions. Run them in parallel where possible.

User must answer - Studio-specific preferences, internal pipeline details, decisions only the user can make. Ask these as a short list - don't guess.

Testable locally - Things that can be verified with a quick command or code snippet. Flag these for the user to test before the build session.

Step 4 - Launch research

For any items in the "search-specialist can answer" bucket, immediately dispatch search-specialist agents in parallel. Be specific in the agent prompts - include the exact version, platform, and context so results are actionable.

Step 5 - Deliver validated summary

Once research returns, deliver a clean summary:

VALIDATED KNOWLEDGE
[OK] [item] - [source or confidence reason]
[OK] [item] - [source or confidence reason]

GAPS FILLED BY RESEARCH
[OK] [item] - [what research found]
~ [item] - [what research found, still some uncertainty]

GAPS REQUIRING USER INPUT
? [question]
? [question]

GAPS TO TEST LOCALLY
 [what to test] - [one-liner or command]

STILL UNKNOWN
[FAIL] [item] - [why it couldn't be resolved and what the risk is if assumed]

Read the full file on GitHub · 63 lines

Changes

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.

  1. today First seen · 63 lines · 58 tokens per session scan A 0ee96658fabb

Subscribe to this mod's changes

gap-check is a skill published in the GitHub repository sideshowroberto/vfx-agent-toolkit (16 stars, last pushed 22d ago), licensed MIT. It adds 58 tokens to every session and 642 once invoked, about $0.0002 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 2026-11-02.

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