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Agent skill

Session Analysis Patterns

by vibeeval in vibeeval/vibecosystem

Claude Code session analysis, tool call patterns, efficiency metrics, and anti-pattern detection

MITAuto-check passed

Install Session Analysis Patterns

skills CLI
$ npx skills add vibeeval/vibecosystem --skill session-analysis-patterns -a claude-code

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

GitHub CLI
$ gh skill install vibeeval/vibecosystem session-analysis-patterns --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/vibeeval/vibecosystem.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/session-analysis-patterns .claude/skills/session-analysis-patterns && 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
session-analysis-patterns
GitHub stars
531
Token cost
~717 tokens
SKILL.md length
192 words
Files
1
Skills in repo
144
Repo updated
First seen
Licence
MIT

At a glance

Claude Code session analysis, tool call patterns, efficiency metrics, and anti-pattern detection

  • SKILL.md covers Session Metrics, Anti-Pattern Catalog, Efficiency Scorer (0-100) and Session Comparison, plus 3 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Session Analysis Patterns is an agent skill from vibeeval/vibecosystem. Claude Code session analysis, tool call patterns, efficiency metrics, and anti-pattern detection

Its SKILL.md is about 720 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: AI software team for Claude Code - 138 agents, 295 skills, 73 hooks. Self-learning, multi-agent swarm, autonomous skill evolution. The licence is MIT.

Example prompts

  • “/session-analysis-patterns”

Requirements

  • Python 3

What it can do on your machine

Read from SKILL.md and the folder at commit 3b763b1. 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 (its code samples are python, markdown and bash).

    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

Session Analysis Patterns loads about 717 tokens when it runs. Until then it costs about 31 tokens; SKILL.md has 192 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~31
When it runs · the whole SKILL.md, loaded when a task matches
~717

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 vibeeval/vibecosystem at commit 3b763b1, republished under its MIT licence (© vibeeval). 192 words, ~717 tokens.

Download SKILL.mdSave it as .claude/skills/session-analysis-patterns/SKILL.md (or your agent's skills folder).
name
session-analysis-patterns
description
Claude Code session analysis, tool call patterns, efficiency metrics, and anti-pattern detection

Session Analysis Patterns

Session Metrics

MetrikİyiOrtaKötü
Tokens per task<50K50-100K>100K
Tool calls per task<2020-40>40
Repeated reads0-12-3>3
Blind edits01>1
Agent spawn efficiency>80% useful50-80%<50%

Anti-Pattern Catalog

#PatternTespitFix
1Repeated ReadAynı dosya 3+ kez okunmuşBilgiyi ilk seferde kaydet
2Wide GrepPattern'siz geniş aramaSpesifik pattern + glob filter
3Blind EditDosya okumadan editRead → Edit sırası zorunlu
4Idle AgentAgent spawn edilip sonuç kullanılmamışGereksiz spawn etme
5Cascade FailAynı hata 3+ kez retryRoot cause analiz et
6Context PollutionAna context'te gereksiz büyük dosya okumaAgent'a delege et
7Premature AgentBasit iş için agent spawnDirekt tool kullan
8Missing ParallelBağımsız işler sıralıParalel agent/tool call
9Over-EngineeringBasit fix için büyük refactoringMinimal değişiklik

Efficiency Scorer (0-100)

python
def calculate_efficiency(session):
    score = 100

    # Penalties
    score -= session.repeated_reads * 5       # -5 per repeated read
    score -= session.blind_edits * 15         # -15 per blind edit
    score -= session.wide_greps * 3           # -3 per wide grep
    score -= session.idle_agents * 10         # -10 per idle agent
    score -= session.cascade_fails * 8        # -8 per cascade fail

    # Bonuses
    score += session.parallel_calls * 2       # +2 per parallel batch
    score += session.first_pass_success * 5   # +5 per first-try success

    return max(0, min(100, score))

Session Comparison

markdown
| Metrik | Session A | Session B | Delta |
|--------|-----------|-----------|-------|
| Total tokens | 45,000 | 120,000 | +167% |
| Tool calls | 12 | 38 | +217% |
| Time (min) | 3 | 12 | +300% |
| Tasks completed | 2 | 2 | 0% |
| Efficiency score | 88 | 42 | -52% |

Braintrust Log Analysis

bash
# Session analizi
btca sessions list --last 7d
btca session <id> --metrics

# Pattern detection
btca session <id> --anti-patterns

# Cost analysis
btca sessions list --sort cost --desc

Checklist

  • Session token usage tracked
  • Anti-pattern detection aktif
  • Efficiency score > 70
  • Repeated reads < 2
  • Blind edits = 0
  • Parallel opportunities exploited
  • Agent spawn ROI positive

Anti-Patterns

  • Her session'ı analiz etmek (sadece outlier'ları analiz et)
  • Metric'lere takılıp task quality'yi ihmal etmek
  • Hız için correctness'tan ödün vermek

© vibeeval, 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/session-analysis-patterns of vibeeval/vibecosystem.

Open the folder on GitHubat commit 3b763b1

Compare with similar skills

Session Analysis Patterns 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.

Session Analysis Patterns compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Session Analysis Patterns this skillvibeeval/vibecosystem531—~717Automated safety check: PassMIT
Efficient Web Researchsickn33/agentic-awesome-skills47k1 repos~2.7kAutomated safety check: PassMIT
GitHub Codespaces Efficiencygithub/awesome-copilot40k—~1.2kAutomated safety check: PassMIT
GitHub Actions Efficiencygithub/awesome-copilot40k—~1.1kAutomated safety check: PassMIT
Efficient FrontierBuilderIO/skills4.5k—~856Automated safety check: PassMIT
Omh Run Efficiencyrlaope/oh-my-hermes3.2k—~1.5kAutomated safety check: PassMIT

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Questions about Session Analysis Patterns

What does Session Analysis Patterns do?

Claude Code session analysis, tool call patterns, efficiency metrics, and anti-pattern detection. Session Analysis Patterns is an agent skill from vibeeval/vibecosystem.

How do I install Session Analysis Patterns in Claude Code?

Run `npx skills add vibeeval/vibecosystem --skill session-analysis-patterns -a claude-code`. Or copy the skill folder (skills/session-analysis-patterns in vibeeval/vibecosystem) into .claude/skills/session-analysis-patterns in your project. Claude Code loads it when a task matches its description.

How do I install Session Analysis Patterns in Codex?

Run `npx skills add vibeeval/vibecosystem --skill session-analysis-patterns -a codex`. Or copy the skill folder (skills/session-analysis-patterns in vibeeval/vibecosystem) into .agents/skills/session-analysis-patterns in your project. Codex loads it when a task matches its description.

Can I use Session Analysis Patterns 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 vibeeval/vibecosystem --skill session-analysis-patterns -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/session-analysis-patterns, .gemini/skills/session-analysis-patterns, .github/skills/session-analysis-patterns and .opencode/skills/session-analysis-patterns in your project.

What does Session Analysis Patterns need to run?

SKILL.md names no scripts, command-line tools or credentials: Session Analysis Patterns is instructions for the agent only. Our summary lists: Python 3.

Does Session Analysis Patterns 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 Session Analysis Patterns 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 Session Analysis Patterns use?

Session Analysis Patterns is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Session Analysis Patterns use?

About 717 tokens (SKILL.md is roughly 2.9k 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 Session Analysis Patterns?

Skills that share tags, products or a category with Session Analysis Patterns: Efficient Web Research (sickn33/agentic-awesome-skills, 47k stars), GitHub Codespaces Efficiency (github/awesome-copilot, 40k stars), GitHub Actions Efficiency (github/awesome-copilot, 40k stars) and Efficient Frontier (BuilderIO/skills, 4.5k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Session Analysis Patterns?

vibeeval (a GitHub user) maintains it in vibeeval/vibecosystem, which has 531 GitHub stars. The repository holds 144 skills in this directory. The repository was last updated on August 8, 2026.

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