default-video-digest

default-video-digest is a skill for Claude Code, Codex from Charlesmpc/by2kb. It costs 17 tokens per session (427 once invoked), scanned A, original, MIT.

A note-taking workflow for turning a video transcript into structured study notes. It keeps the transcript as evidence and links important points to source timestamps when available.

In plain words
What is it for?
Use it to create a central summary, map the main ideas, and produce a guided walkthrough of a video's content.
Why use it?
It helps turn a long or difficult transcript into material that is easier to understand, question, remember, and apply without inventing unsupported claims.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/charlesmpc/by2kb/default
Any agent
npx skills add Charlesmpc/by2kb --skill default
Clone the repo
git clone --depth 1 https://github.com/Charlesmpc/by2kb

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 default-video-digest

README.md
[![agentmods](https://agentmods.dev/badge/skills/charlesmpc/by2kb/default.svg)](https://agentmods.dev/skills/charlesmpc/by2kb/default)
Your own site
<a href="https://agentmods.dev/skills/charlesmpc/by2kb/default"><img src="https://agentmods.dev/badge/skills/charlesmpc/by2kb/default.svg" alt="Measured on agentmods" height="20"></a>
Per session 17 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 427 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original 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 $0.00017 $0.00427
Opus 5 $0.00009 $0.00214
Sonnet 5 $0.00003 $0.00085
Haiku 4.5 $0.00002 $0.00043

Measured 3d ago against content hash 1c4bcebbe9c7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

default-video-digest 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 3d 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.

by2kb/skills/builtin/default/SKILL.md · 43 lines

What it actually says

Deep study notes

Goal

Create a self-contained learning guide that helps the reader understand, question, retain, and apply the video's content without replacing the source evidence.

Rules

  1. Preserve the raw transcript separately; never reproduce or overwrite it here.
  2. Write in the transcript's primary language unless the source metadata strongly indicates another language.
  3. Do not invent claims, speakers, evidence, chapters, or timestamps.
  4. Link chapters and important claims to the nearest available source timestamp. If the transcript has no useful segment timing, omit timestamp links rather than inventing them.
  5. Clearly distinguish the speaker's claims from your synthesis or questions.
  6. Explain important concepts and reasoning chains instead of merely listing topics.
  7. If the transcript is incomplete or low quality, state the limitation prominently.

Output

Produce these sections, omitting only sections for which the transcript has no basis:

  1. # 核心结论 / # Core thesis — the purpose, conclusion, and argument in context.
  2. ## 知识地图 / ## Knowledge map — how the major concepts relate.
  3. ## 分段精读 / ## Guided walkthrough — structured chapters with grounded timestamps and detailed explanations.
  4. ## 关键论点与证据 / ## Claims and evidence — pair each important claim with the support actually offered, and flag unsupported assertions.
  5. ## 概念与术语 / ## Concepts and terminology — concise definitions in context.
  6. ## 反思与待验证问题 / ## Questions and checks — assumptions, uncertainties, counterarguments, and facts worth independently verifying.
  7. ## 学习与行动清单 / ## Study and action list — review prompts, exercises, or next actions that follow from the material.
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. 3d ago First seen · 43 lines · 17 tokens per session scan A 1c4bcebbe9c7

Subscribe to this mod's changes

default-video-digest is a skill published in the GitHub repository Charlesmpc/by2kb (2 stars, last pushed 5d ago), licensed MIT. It adds 17 tokens to every session and 427 once invoked, about $0.0001 per session on Opus 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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