Agent skill

Sem Integration

Provides sem semantic-diff detection, install-on-first-use, and fallback patterns.

MITAuto-check passedDevelopment

Install Sem Integration

skills CLI

$ npx skills add athola/claude-night-market --skill sem-integration -a claude-code

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

GitHub CLI

$ gh skill install athola/claude-night-market sem-integration --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/athola/claude-night-market.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/leyline/skills/sem-integration .claude/skills/sem-integration && 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/

Paste into Claude Code

Install the "sem-integration" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/leyline/skills/sem-integration into .claude/skills/sem-integration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sem-integration", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/athola/claude-night-market/tree/master/plugins/leyline/skills/sem-integration

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add athola/claude-night-market --skill sem-integration -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install athola/claude-night-market sem-integration --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .agents/skills && cp -r skills-src/plugins/leyline/skills/sem-integration .agents/skills/sem-integration && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "sem-integration" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/leyline/skills/sem-integration into .agents/skills/sem-integration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sem-integration", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add athola/claude-night-market --skill sem-integration -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install athola/claude-night-market sem-integration --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/plugins/leyline/skills/sem-integration .cursor/skills/sem-integration && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "sem-integration" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/leyline/skills/sem-integration into .cursor/skills/sem-integration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sem-integration", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/athola/claude-night-market.git --path plugins/leyline/skills/sem-integration

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add athola/claude-night-market --skill sem-integration -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install athola/claude-night-market sem-integration --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/plugins/leyline/skills/sem-integration .gemini/skills/sem-integration && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "sem-integration" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/leyline/skills/sem-integration into .gemini/skills/sem-integration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sem-integration", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install athola/claude-night-market sem-integration

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add athola/claude-night-market --skill sem-integration -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .github/skills && cp -r skills-src/plugins/leyline/skills/sem-integration .github/skills/sem-integration && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "sem-integration" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/leyline/skills/sem-integration into .github/skills/sem-integration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sem-integration", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add athola/claude-night-market --skill sem-integration -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install athola/claude-night-market sem-integration --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/athola/claude-night-market.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/plugins/leyline/skills/sem-integration .opencode/skills/sem-integration && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "sem-integration" agent skill from https://github.com/athola/claude-night-market/tree/master/plugins/leyline/skills/sem-integration into .opencode/skills/sem-integration/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "sem-integration", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: sem-integration
GitHub stars: 342
Token cost: ~698 tokens
SKILL.md length: 204 words
Files: 3
Skills in repo: 159
Repo updated: Oct 6, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Provides sem semantic-diff detection, install-on-first-use, and fallback patterns.

Building skills that consume git diff output
SKILL.md covers When To Use, When NOT To Use, Detection Pattern and Semantic Diff Pattern, plus 2 more sections
Calls git

What it does

Sem Integration is an agent skill from athola/claude-night-market. Provides sem semantic-diff detection, install-on-first-use, and fallback patterns. Use when building skills that consume git diff output.

Its SKILL.md is about 700 tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files (for example `modules/detection.md` and `modules/fallback.md`).

It sits in Development. It works with Git. The repository describes itself as: 23 Claude Code plugins: TDD enforcement hooks, git/PR workflows, spec-driven development, code review, project lifecycle, fix-from-error, maintenance automation, context… The licence is MIT.

When your agent uses it

Building skills that consume git diff output

Example prompts

“Use the sem-integration skill to provide sem semantic-diff detection, install-on-first-use, and fallback patterns”
“/sem-integration”

What it can do on your machine

Read from SKILL.md and the folder at commit 9f3eb00. 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
Shell commands in SKILL.md call:
- git
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
- github.com
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

Sem Integration loads about 698 tokens when it runs. Until then it costs about 38 tokens; SKILL.md has 204 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~38
When it runs · the whole SKILL.md, loaded when a task matches: ~698

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 athola/claude-night-market at commit 9f3eb00, republished under its MIT licence (© athola). 204 words, ~698 tokens.

Download SKILL.mdSave it as .claude/skills/sem-integration/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.

name: sem-integration
description: Provides sem semantic-diff detection, install-on-first-use, and fallback patterns. Use when building skills that consume git diff output.
alwaysApply: false
category: infrastructure
tags: sem, semantic-diff, git, foundation
provides.infrastructure: sem-detection, sem-fallback
provides.patterns: install-on-first-use, graceful-degradation
estimated_tokens: 400
progressive_loading: true
module_strategy: reference-based
modules: modules/detection.md, modules/fallback.md

sem Integration

Foundation patterns for using sem semantic diffs in night-market skills.

When To Use

Consult this skill when building or modifying skills that consume git diff output. It provides the detection, installation, and fallback patterns.

When NOT To Use

Direct sem CLI usage (just run sem diff yourself)
Skills that don't consume diff output

Detection Pattern

Check sem availability once per session:

bash

# Detection (cache per session)
_sem_check() {
  local cache="${CLAUDE_CODE_TMPDIR:-/tmp}/sem-available"
  if [ -f "$cache" ]; then
    cat "$cache"
    return
  fi
  if command -v sem &>/dev/null; then
    echo "1" | tee "$cache"
  else
    echo "0" | tee "$cache"
  fi
}

When _sem_check returns 0, offer installation. See modules/detection.md for install-on-first-use logic and platform-specific commands.

Semantic Diff Pattern

Primary path (sem available):

bash

sem diff --format json <baseline>

Fallback path (sem unavailable):

bash

git diff --name-only --diff-filter=A <baseline>
git diff --name-only --diff-filter=M <baseline>
git diff --name-only --diff-filter=D <baseline>
git diff --name-only --diff-filter=R <baseline>

See modules/fallback.md for output normalization that produces the same entity schema from both paths.

Impact Analysis Pattern

Primary path (sem available):

bash

sem impact --json <file-or-entity>

Fallback path (sem unavailable): use rg/grep to trace callers by filename. See modules/fallback.md.

Exit Criteria

_sem_check result cached per session at ${CLAUDE_CODE_TMPDIR:-/tmp}/sem-available; detection command runs at most once per session regardless of how many skills invoke it
When sem is unavailable, install offer presented and fallback path used automatically (git diff --name-only --diff-filter= variants); no silent failure
Fallback output normalized to the same entity schema as sem JSON output per modules/fallback.md; consumers downstream see the same structure from both paths
Skills consuming this integration declare dependencies: [leyline:sem-integration] in frontmatter rather than reimplementing the detection pattern

Files

SKILL.md and 2 other files in plugins/leyline/skills/sem-integration of athola/claude-night-market.

SKILL.md
modules/detection.md
modules/fallback.md

Open the folder on GitHubat commit 9f3eb00

Compare with similar skills

Sem Integration 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.

Sem Integration compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Sem Integration this skillathola/claude-night-market	342	—	~698	Automated safety check: Pass	MIT	2 days ago
Finishing a Development Branchobra/superpowers	296k	5 repos	~1.9k	Automated safety check: Pass	MIT	today
Code Review ChecklistshareAI-lab/learn-claude-code	78k	5 repos	~1.1k	Automated safety check: Pass	MIT	10 days ago
Codebase Knowledge Graph Q&AEgonex-AI/Understand-Anything	86k	1 repos	~1.2k	Automated safety check: Pass	MIT	2 days ago
Code Design Rationale Investigatorcursor/plugins	10k	9 repos	~2.6k	Automated safety check: Pass	None	today
Understand Diff AnalysisEgonex-AI/Understand-Anything	86k	1 repos	~1.4k	Automated safety check: Pass	MIT	2 days ago

Similar skills

Finishing a Development Branch
obra/superpowers
Walks the last step of a branch: confirm tests pass, detect the git environment, ask how to integrate, carry out your choice and clean up the worktree.
296k GitHub starsUsed in 5 repos~1.9k tokens
DevelopmentAuto-check passed
Code Review Checklist
shareAI-lab/learn-claude-code
Reviews code against a five-part checklist covering security, correctness, performance, maintainability and testing, and reports findings in a fixed format.
78k GitHub starsUsed in 5 repos~1.1k tokens
DevelopmentAuto-check passed
Codebase Knowledge Graph Q&A
Egonex-AI/Understand-Anything
Answers questions about a codebase by searching a prebuilt knowledge graph of its files, functions, classes and dependencies, not by rereading every source file.
86k GitHub starsUsed in 1 repo~1.2k tokens
DevelopmentAuto-check passed
Code Design Rationale Investigator
cursor/plugins
Official
Digs into why code is shaped the way it is by checking git history, pull requests and connected tools in parallel, then reporting a cited read on the tradeoffs.
10k GitHub starsUsed in 9 repos~2.6k tokens
DevelopmentAuto-check passed
Understand Diff Analysis
Egonex-AI/Understand-Anything
Reads your git changes or a pull request against a prebuilt knowledge graph of the project to explain what changed, which components are affected and what is risky.
86k GitHub starsUsed in 1 repo~1.4k tokens
DevelopmentAuto-check passed
Understand Explain
Egonex-AI/Understand-Anything
Gives an in-depth explanation of one file, function or module by reading the project's knowledge graph and checking that the graph is still fresh.
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DevelopmentAuto-check passed

Questions about Sem Integration

What does Sem Integration do?

Provides sem semantic-diff detection, install-on-first-use, and fallback patterns. Sem Integration is an agent skill from athola/claude-night-market. Provides sem semantic-diff detection, install-on-first-use, and fallback patterns.

When should I use Sem Integration?

Sem Integration fits situations like: building skills that consume git diff output.

How do I install Sem Integration in Claude Code?

Run `npx skills add athola/claude-night-market --skill sem-integration -a claude-code`. Or copy the skill folder (plugins/leyline/skills/sem-integration in athola/claude-night-market) into .claude/skills/sem-integration in your project. Claude Code loads it when a task matches its description.

How do I install Sem Integration in Codex?

Run `npx skills add athola/claude-night-market --skill sem-integration -a codex`. Or copy the skill folder (plugins/leyline/skills/sem-integration in athola/claude-night-market) into .agents/skills/sem-integration in your project. Codex loads it when a task matches its description.

Can I use Sem Integration 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 athola/claude-night-market --skill sem-integration -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sem-integration, .gemini/skills/sem-integration, .github/skills/sem-integration and .opencode/skills/sem-integration in your project.

What does Sem Integration need to run?

Going by SKILL.md and its folder, Sem Integration needs the command-line tools its instructions call (git).

Does Sem Integration access the network?

SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.

Is Sem Integration 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 Sem Integration use?

Sem Integration 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 Sem Integration use?

About 698 tokens (SKILL.md is roughly 2.8k 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 Sem Integration?

Skills that share tags, products or a category with Sem Integration: Finishing a Development Branch (obra/superpowers, 296k stars), Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars), Codebase Knowledge Graph Q&A (Egonex-AI/Understand-Anything, 86k stars) and Code Design Rationale Investigator (cursor/plugins, 10k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Sem Integration?

athola (a GitHub user) maintains it in athola/claude-night-market, which has 342 GitHub stars. The repository holds 159 skills in this directory. The repository was last updated on October 6, 2026.

Source: athola/claude-night-market on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Sem Integration

Install Sem Integration

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

sem Integration

When To Use

When NOT To Use

Detection Pattern

Semantic Diff Pattern

Impact Analysis Pattern

Exit Criteria

Files

Compare with similar skills

Similar skills

Finishing a Development Branch

Code Review Checklist

Codebase Knowledge Graph Q&A

Code Design Rationale Investigator

Understand Diff Analysis

Understand Explain

More from athola/claude-night-market

Night Market Diagnostics Toolkit

Skills Eval

Agent Teams

Delegation Core

Elegant Code

Skill Library Mission

Questions about Sem Integration

Install Sem Integration

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

sem Integration

When To Use

When NOT To Use

Detection Pattern

Semantic Diff Pattern

Impact Analysis Pattern

Exit Criteria

Files

Compare with similar skills

Similar skills

More from athola/claude-night-market

Related

Questions about Sem Integration