Agent skill

Summarization

by jwynia in jwynia/agent-skills

Create effective summaries by matching summarization type to purpose, audience, and context.

MITAuto-check passedWriting & Content

Install Summarization

skills CLI
$ npx skills add jwynia/agent-skills --skill summarization -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install jwynia/agent-skills summarization --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/jwynia/agent-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/general/writing/revision/summarization .claude/skills/summarization && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
summarization
GitHub stars
166
Token cost
~1.5k tokens
SKILL.md length
645 words
Files
1
Skills in repo
112
Repo updated
First seen
Licence
MIT

At a glance

Create effective summaries by matching summarization type to purpose, audience, and context.

  • Works in 5 steps: Purpose: What will this summary be used… → Audience: Who will read it? → Scope: How comprehensive? → …
  • Asked to summarize
  • SKILL.md covers Purpose, Core Principle, Clarifying Questions and Summary Type Taxonomy, plus 5 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Summarization is an agent skill from jwynia/agent-skills. Create effective summaries by matching summarization type to purpose, audience, and context. Use when asked to summarize, create TLDR, condense content, or create executive summaries. Keywords: summary, TLDR, condense, executive summary, abstract.

Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Writing & Content, covering Summarization. The licence is MIT.

When your agent uses it

  • Asked to summarize
  • Condense content
  • Create executive summaries

Example prompts

  • “/summarization”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Purpose: What will this summary be used for?
  2. Audience: Who will read it?
  3. Scope: How comprehensive?
  4. Emphasis: What aspects are most important?
  5. Format: What structure?

What it can do on your machine

Read from SKILL.md and the folder at commit e02ec7e. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Summarization loads about 1.5k tokens when it runs. Until then it costs about 65 tokens; SKILL.md has 645 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~65
When it runs · the whole SKILL.md, loaded when a task matches
~1.5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from jwynia/agent-skills at commit e02ec7e, republished under its MIT licence (© jwynia). 645 words, ~1,531 tokens.

Download SKILL.mdSave it as .claude/skills/summarization/SKILL.md (or your agent's skills folder).
name
summarization
description
Create effective summaries by matching summarization type to purpose, audience, and context. Use when asked to summarize, create TLDR, condense content, or create executive summaries. Keywords: summary, TLDR, condense, executive summary, abstract.
license
MIT
metadata.author
jwynia
metadata.version
1.0
metadata.type
utility
metadata.mode
generative
metadata.domain
writing

Summarization

Purpose

Create effective summaries by matching summarization type to purpose, audience, and context. "Summarize" can mean many different things—this skill helps identify and execute the right approach.

Core Principle

Summarization is translation, not just reduction. Different purposes require different summary types. Clarify the need before condensing.


Clarifying Questions

Before summarizing, consider:

  1. Purpose: What will this summary be used for?

    • Decision-making
    • Background information
    • Further research
    • Quick understanding
    • Reference/recall
  2. Audience: Who will read it?

    • Technical experts
    • General audience
    • Decision makers
    • Familiar/unfamiliar with topic
  3. Scope: How comprehensive?

    • Ultra-brief (single sentence)
    • Brief (paragraph)
    • Moderate (page)
    • Extended (multiple pages)
  4. Emphasis: What aspects are most important?

    • Methodology
    • Findings/results
    • Arguments/claims
    • Context/background
    • Implications/applications
  5. Format: What structure?

    • Narrative text
    • Bullet points
    • Hierarchical outline
    • Visual representation

Summary Type Taxonomy

Information Reduction Approaches
TypeWhat It IsWhen to Use
Key Point ExtractionIsolating the most important claimsOriginal has discrete important points
AbstractionHigher-level statements covering multiple detailsPatterns matter more than specifics
GistingCapturing essential meaning, discarding detailsOnly core message matters
CompressionShortening while preserving informationComprehensive coverage needed in less space
Structural Approaches
TypeWhat It IsWhen to Use
Executive SummaryBusiness-focused: decisions, recommendations, outcomesDocuments requiring action
Abstract/PrécisAcademic: methodology and findingsResearch papers, technical documents
TLDRUltra-brief main takeawayCasual communication, extreme brevity
OutlineHierarchical structure of main/supporting pointsLogical structure matters
Purpose-Oriented Approaches
TypeWhat It IsWhen to Use
SynthesisCombining multiple sources coherentlySummarizing across documents
Critical SummaryEvaluating claims while condensingAssessment of quality needed
Contextual SummaryFraming within broader knowledgeUnderstanding bigger picture matters
Actionable SummaryFocusing on implications and next stepsSummary will drive action

Execution by Type

Key Point Extraction
  1. Scan for topic sentences and conclusions
  2. Identify explicitly stated main ideas
  3. List each distinct point
  4. Preserve original phrasing where powerful

Example: "The author makes three main arguments: (1)..., (2)..., (3)..."

Abstraction
  1. Group related details
  2. Find common themes or patterns
  3. Create higher-level statements
  4. Reduce specifics to principles

Example: "Multiple studies consistently show..." instead of listing 12 studies

Gisting
  1. Ask: "What is the one thing to remember?"
  2. Distill to core insight
  3. Remove all supporting detail
  4. Verify essence is preserved

Example: "Remote work increases productivity for most knowledge workers."

Show full SKILL.md (268 more words)Show less
Executive Summary
  1. State the problem/opportunity
  2. Present the solution/recommendation
  3. Highlight key benefits
  4. Note costs/risks
  5. Specify required actions
Synthesis
  1. Read all sources
  2. Identify common themes
  3. Note contradictions
  4. Find complementary information
  5. Create unified narrative

Example: "Across the five reports, three key trends emerge..."

Critical Summary
  1. Summarize the claims
  2. Evaluate the evidence
  3. Assess methodology
  4. Note limitations
  5. Conclude with assessment

Example: "While the author claims X, the evidence is limited by..."


Format Variations

Quotation-Based
  • Use key phrases verbatim
  • When precise wording is important
  • Select and organize most important quotes
Bullet Points
  • Break continuous text into discrete units
  • When quick scanning is valued
  • Make each point standalone
Progressive Summary
  • Start ultra-brief
  • Add layers of detail
  • Let reader choose depth
Comparative Summary
  • Side-by-side analysis
  • Highlight similarities and differences
  • When contrasting sources

Quality Checklist

  • Purpose is clear
  • Audience is considered
  • Scope is appropriate
  • Emphasis matches needs
  • Format serves purpose
  • Core message is preserved
  • Reduction is proportional
  • No invented information
  • Attribution where needed

Anti-Patterns

The Information Dump

Problem: Reduces length but not complexity Fix: Focus on what matters, not just what's short

The Distortion

Problem: Changes meaning through compression Fix: Verify summary against original claims

The One-Size-Fits-All

Problem: Same approach for all requests Fix: Match type to purpose and audience

The Over-Abstraction

Problem: Loses all useful specifics Fix: Preserve concrete details that support understanding


Integration Points

Inbound:

  • When asked to summarize any content
  • When processing long documents
  • When creating documentation

Outbound:

  • To decision-making processes
  • To knowledge management systems
  • To communication outputs

Complementary:

  • speech-adaptation: For spoken summaries
  • voice-analysis: For maintaining voice in summaries

© jwynia, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/general/writing/revision/summarization of jwynia/agent-skills.

Open the folder on GitHubat commit e02ec7e

Compare with similar skills

Summarization next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Summarization compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Summarization this skilljwynia/agent-skills166—~1.5kAutomated safety check: PassMIT
News Aggregator Skillcclank/news-aggregator-skill1.3k—~2.1kAutomated safety check: PassNone
Vss Search ArchiveNVIDIA-AI-Blueprints/video-search-and-summarization1.9k—~3.6kAutomated safety check: PassApache-2.0
AI Daily Newsgeekjourneyx/ai-daily-skill235—~2.3kAutomated safety check: PassNone
AnalyzeriBigQiang/feedgrab614—~1kAutomated safety check: PassMIT
Reportmicrosoft/data-formulator18k—~1.5kAutomated safety check: PassMIT

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Questions about Summarization

What does Summarization do?

Create effective summaries by matching summarization type to purpose, audience, and context. Summarization is an agent skill from jwynia/agent-skills. Create effective summaries by matching summarization type to purpose, audience, and context.

When should I use Summarization?

Summarization fits situations like: asked to summarize; condense content; create executive summaries.

How do I install Summarization in Claude Code?

Run `npx skills add jwynia/agent-skills --skill summarization -a claude-code`. Or copy the skill folder (skills/general/writing/revision/summarization in jwynia/agent-skills) into .claude/skills/summarization in your project. Claude Code loads it when a task matches its description.

How do I install Summarization in Codex?

Run `npx skills add jwynia/agent-skills --skill summarization -a codex`. Or copy the skill folder (skills/general/writing/revision/summarization in jwynia/agent-skills) into .agents/skills/summarization in your project. Codex loads it when a task matches its description.

Can I use Summarization in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add jwynia/agent-skills --skill summarization -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/summarization, .gemini/skills/summarization, .github/skills/summarization and .opencode/skills/summarization in your project.

What does Summarization need to run?

SKILL.md names no scripts, command-line tools or credentials: Summarization is instructions for the agent only.

Does Summarization access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Summarization safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Summarization use?

Summarization is published under the MIT licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Summarization use?

About 1.5k tokens (SKILL.md is roughly 6.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Summarization?

Skills that share tags, products or a category with Summarization: News Aggregator Skill (cclank/news-aggregator-skill, 1.3k stars), Vss Search Archive (NVIDIA-AI-Blueprints/video-search-and-summarization, 1.9k stars), AI Daily News (geekjourneyx/ai-daily-skill, 235 stars) and Analyzer (iBigQiang/feedgrab, 614 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Summarization?

jwynia (a GitHub user) maintains it in jwynia/agent-skills, which has 166 GitHub stars. The repository holds 112 skills in this directory. The repository was last updated on February 24, 2026.

Source: jwynia/agent-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.