Browse Skills — Page 45

codebase-cleanup-refactor-clean-v2

diegosouzapw/awesome-omni-skills

Refactor and Clean Code workflow skill. Use this skill when the user needs You are a code refactoring expert specializing in clean code principles, SOLID design patterns, and modern software engineering best practices. Analyze and refactor the provided code to improve its quality, maintainability, and performance and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.

codebase-cleanup-tech-debt

diegosouzapw/awesome-omni-skills

Technical Debt Analysis and Remediation workflow skill. Use this skill when the user needs You are a technical debt expert specializing in identifying, quantifying, and prioritizing technical debt in software projects. Analyze the codebase to uncover debt, assess its impact, and create acti and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.

codebase-cleanup-tech-debt-v2

diegosouzapw/awesome-omni-skills

Technical Debt Analysis and Remediation workflow skill. Use this skill when the user needs You are a technical debt expert specializing in identifying, quantifying, and prioritizing technical debt in software projects. Analyze the codebase to uncover debt, assess its impact, and create acti and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.

codebase-inspection

NousResearch/hermes-agent

Inspect codebases w/ pygount: LOC, languages, ratios.

codebase-migrate

ComposioHQ/awesome-codex-skills

Run large codebase migrations and multi-file refactors. Uses the Composio CLI to coordinate issue tracking, batched PRs, and CI verification while the agent executes the transforms locally across hundreds of files.

codebase-onboarding

affaan-m/ECC

Analyze an unfamiliar codebase and generate a structured onboarding guide with architecture map, key entry points, conventions, and a starter CLAUDE.md. Use when joining a new project or setting up Claude Code for the first time in a repo.

codebase-overview

notque/vexjoy-agent

Systematic codebase exploration and architecture mapping.

codebase-review

HoangNguyen0403/agent-skills-standard

Review an entire codebase against framework best practices and generate a prioritized improvement plan.

codebase-to-wordpress-converter

diegosouzapw/awesome-omni-skills

Codebase to WordPress Converter workflow skill. Use this skill when the user needs Expert skill for converting any codebase (React/HTML/Next.js) into a pixel-perfect, SEO-optimized, and dynamic WordPress theme and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.

codebase-to-wordpress-converter-v2

diegosouzapw/awesome-omni-skills

Codebase to WordPress Converter workflow skill. Use this skill when the user needs Expert skill for converting any codebase (React/HTML/Next.js) into a pixel-perfect, SEO-optimized, and dynamic WordPress theme and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.

codegen

vercel-labs/json-render

Code generation utilities for json-render. Use when generating code from UI specs, building custom code exporters, traversing specs, or serializing props for @json-render/codegen.

codeinterpreter-automation

ComposioHQ/awesome-claude-skills

"Automate Codeinterpreter tasks via Rube MCP (Composio). Always search tools first for current schemas."

codemap

jellydn/my-ai-tools

Orchestrate parallel codebase analysis to produce 7 structured documents about the codebase in .planning/codebase/

codenavi

tech-leads-club/agent-skills

Your pathfinder for navigating unknown codebases. Investigates with precision, implements surgically, and never assumes — if it doesn't know, it says so. Maintains a .notebook/ knowledge base that grows across sessions, turning every discovery into lasting intelligence. Summons available skills, MCPs, and docs when the mission demands. Use when fixing bugs, implementing features, refactoring, investigating flows, or any development task in unfamiliar territory. Triggers on "fix this", "implement this", "how does this work", "investigate this flow", "help me with this code". Do NOT use for greenfield scaffolding, CI/CD, or infrastructure provisioning.

trailofbits/codeql

trailofbits/skills

>-

github/codeql

github/awesome-copilot

Comprehensive guide for setting up and configuring CodeQL code scanning via GitHub Actions workflows and the CodeQL CLI. This skill should be used when users need help with code scanning configuration, CodeQL workflow files, CodeQL CLI commands, SARIF output, security analysis setup, or troubleshooting CodeQL analysis.

coderabbit

TerminalSkills/skills

>-

CodeRabbit CLI

ComposioHQ/awesome-agent-clis

"Review local code changes before commit, surface bugs and security issues, and feed findings back into an AI coding loop. Use when an agent needs to run terminal-native code review on a Git repo and act on the results."

codereadr-automation

ComposioHQ/awesome-claude-skills

"Automate Codereadr tasks via Rube MCP (Composio). Always search tools first for current schemas."

codex

NousResearch/hermes-agent

Delegate coding to OpenAI Codex CLI (features, PRs).

codex-bug

openai/codex

Diagnose GitHub bug reports in openai/codex. Use when given a GitHub issue URL from openai/codex and asked to decide next steps such as verifying against the repo, requesting more info, or explaining why it is not a bug; follow any additional user-provided instructions.

codex-cc-guide

aAAaqwq/AGI-Super-Team

如何用 ACP sessions_spawn 调用 Claude Code / Codex 写代码 — 小code 团队编码任务指南

codex-cli-bridge

alirezarezvani/claude-code-skill-factory

Bridge between Claude Code and OpenAI Codex CLI - generates AGENTS.md from CLAUDE.md, provides Codex CLI execution helpers, and enables seamless interoperability between both tools

codex-cli-runtime

openai/codex-plugin-cc

Internal helper contract for calling the codex-companion runtime from Claude Code

codex-expo-run-actions

openai/plugins

Wire Expo projects into the Codex app with project-local run scripts and .codex/environments/environment.toml actions. Use when the user wants the Codex app Run button, build/run actions, action buttons, or a stable Expo start/run workflow from Codex.

codex-issue-digest

openai/codex

Run a GitHub issue digest for openai/codex by feature-area labels, all areas, and configurable time windows. Use when asked to summarize recent Codex bug reports or enhancement requests, especially for owner-specific labels such as tui, exec, app, or similar areas.

codex-pr-body

openai/codex

Update the title and body of one or more pull requests.

codex-prompting

joelhooks/joelclaw

"Use this skill for any request to trigger, coordinate, or craft prompts for Codex. Use when user says 'send to codex', 'use codex', 'prompt codex', 'ask codex', 'delegate to codex', 'run in codex', or asks for a Codex-first execution handoff."

codex-result-handling

openai/codex-plugin-cc

Internal guidance for presenting Codex helper output back to the user

codex-review

alinaqi/maggy

OpenAI Codex CLI code review with GPT-5.2-Codex, CI/CD integration

codex-review-v2

diegosouzapw/awesome-omni-skills

codex-review workflow skill. Use this skill when the user needs Professional code review with auto CHANGELOG generation, integrated with Codex AI. Use when you want professional code review before commits, you need automatic CHANGELOG generation, or reviewing large-scale refactoring and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.

codex-team

boshu2/agentops

Coordinate multiple Codex agents.

coding-agent

openclaw/openclaw

Delegate coding work to Codex, Claude Code, OpenCode, or Pi as background workers; not simple edits or read-only code lookup.

coding-guidelines

tech-leads-club/agent-skills

Behavioral guidelines to reduce common LLM coding mistakes. Use when writing, modifying, or reviewing code — implementation tasks, code changes, refactoring, bug fixes, or feature development. Do NOT use for architecture design, documentation, or non-code tasks.

coding-mojo

oaustegard/claude-skills

Develop and run Mojo code in Claude.ai containers. Handles installation, compilation, and execution. Use when writing Mojo code, benchmarking Mojo vs Python, or when user mentions Mojo, Modular, or MAX. Routes to Modular's official skills (mojo-syntax, mojo-python-interop, mojo-gpu-fundamentals) for language-specific correction layers.

coding-prefs

langchain-ai/deepagents

Read the user's coding preferences from /memory/coding-prefs.md before making non-trivial style decisions, and append new preferences when the user gives durable feedback.

coding-principles

shinpr/claude-code-workflows

Language-agnostic coding principles for maintainability, readability, and quality. Use when implementing features, refactoring code, or reviewing code quality.

coding-standards

affaan-m/ECC

Baseline cross-project coding conventions for naming, readability, immutability, and code-quality review. Use detailed frontend or backend skills for framework-specific patterns.

coding-standards

cloudflare/sandbox-sdk

Use when writing or reviewing TypeScript in this repo. Covers the no-`any` rule and where to put new types, the uppercase-acronym style guide, and the rules for code comments (no historical context). (project)

coding-standards-ts

TheBeardedBearSAS/claude-craft

Paperclip-TypeScript-Coding-Standards — Strict-Modus, Kebab-Files, kein any, strukturierte Logs. Verwenden Sie dies beim Schreiben oder Reviewen von Paperclip-TS-Code.

coding-tutor

EveryInc/compound-engineering-plugin

Personalized coding tutorials that build on your existing knowledge and use your actual codebase for examples. Creates a persistent learning trail that compounds over time using the power of AI, spaced repetition and quizes.

cognitive-accessibility

Community-Access/accessibility-agents

WCAG 2.2 cognitive accessibility reference tables, plain language analysis, COGA guidance, auth pattern detection, and reading level analysis. Use when reviewing UI for cognitive load, plain language clarity, WCAG 2.2 new criteria (3.3.7 Redundant Entry, 3.3.8/3.3.9 Accessible Authentication), timeout warnings, and memory demands.

cognitive-biases

guia-matthieu/clawfu-skills

"Apply Kahneman and Thaler's behavioral economics principles to marketing—understand how customers actually make decisions and design experiences that work with human psychology, not against it. Use when: **Improve conversion rates** by removing friction and applying behavioral nudges; **Design pricing pages** that guide customers toward optimal choices; **Write copy that resonates** with how people actually process information; **Create urgency and scarcity** that feels authentic, not manipul..."

cognitive-design

lyndonkl/claude

Grounds visual design decisions in cognitive psychology principles — perception, attention, memory, Gestalt grouping, and visual encoding hierarchy — explaining WHY certain designs work. Covers interfaces, data visualizations, educational content, and presentations. Invoke when user mentions cognitive load, visual hierarchy, working memory, preattentive processing, Gestalt principles, encoding hierarchy, or cognitive design pyramid. For design evaluation, use `design-evaluation-audit`. For fallacy prevention, use `cognitive-fallacies-guard`. For data storytelling, use `visual-storytelling-design`.

cognitive-fallacies-guard

lyndonkl/claude

Detects and prevents visual misleads, cognitive biases, and data integrity violations in visualizations, dashboards, reports, and presentations. Audits charts for honesty, diagnoses misinterpretation causes, and provides specific fixes. Invoke when user mentions chartjunk, misleading chart, truncated axis, data integrity, visual deception, 3D chart problems, cherry-picking data, or needs to audit visualizations for accuracy. For general design evaluation, use `design-evaluation-audit`. For cognitive foundations, use `cognitive-design`.

cognito-user-analysis

ClipboardHealth/core-utils

Use when looking up Cognito user details by sub UUID, finding duplicate accounts sharing phone or email, analyzing which duplicates to keep vs delete, or fixing orphaned UNCONFIRMED signups. Symptoms include 403 Forbidden on login, multiple accounts for same phone, backend sync issues.

cohere-api

TerminalSkills/skills

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coherence-diagnosis

yogsoth-ai/de-anthropocentric-research-engine

Strategy for auditing preference consistency using Consistency Ratio, cycle enumeration, and mElo to detect and resolve intransitivities.

cohesion-over-testability

EpicenterHQ/epicenter

Detect and collapse production code that was split into two pieces (a 'pure' inner function and a thin wrapper/handler/component that calls it) for the single purpose of letting a unit test reach the inner piece. The smell is structure shaped by the test suite, not by the system. Use when reviewing a helper paired with a `.test.ts` of similar or greater size, when an exported function has exactly one production caller next door, when a function takes optional `deps` whose only non-default value lives in the test, when a getter/setter pair injects state the production code already owns, or when the user says \"is this earning its keep\", \"why is this exported\", \"trace the callers\", \"is this split for the test\", \"the test is shaping the API\", \"could this be one function\". Prefer cohesion over unit-testability; pay the regression-coverage cost a different way (integration tests, type safety, deletion).

cohesive-clean-breaks

EpicenterHQ/epicenter

Asymmetric-wins pass for decisions that change public shape, package boundaries, runtime contracts, naming, config structure, lifecycle ownership, or migration strategy. Refuse 10-20% of functionality to collapse 80-90% of complexity. Use when proposing a breaking change, replacing an API, redesigning ownership, planning a multi-wave replacement, or deciding whether to keep both old and new paths alive.

cohort-analysis

mohitagw15856/pm-claude-skills

Structure a cohort analysis for retention, LTV, or behavioural patterns. Use when asked to run a cohort analysis, analyse retention by cohort, segment users by behaviour over time, or calculate lifetime value by acquisition period. Produces a complete cohort analysis framework with methodology, cohort definitions, retention curves, and prioritised interventions.

cohort-study-quality-assessment-nos

aipoch/medical-research-skills

Evaluates the quality of cohort studies using the Newcastle-Ottawa Scale (NOS). Use when the user provides a cohort study article or text and needs a quality assessment report.

Coinbase Automation

ComposioHQ/awesome-claude-skills

"Coinbase Automation: list and manage cryptocurrency wallets, accounts, and portfolio data via Coinbase CDP SDK"

coingecko

TermiX-official/cryptoclaw

Query CoinGecko API for prices, market data, trending tokens, and historical charts.

coinmarketcal-automation

ComposioHQ/awesome-claude-skills

"Automate Coinmarketcal tasks via Rube MCP (Composio). Always search tools first for current schemas."

coinmarketcap-automation

ComposioHQ/awesome-claude-skills

"Automate Coinmarketcap tasks via Rube MCP (Composio). Always search tools first for current schemas."

coinranking-automation

ComposioHQ/awesome-claude-skills

"Automate Coinranking tasks via Rube MCP (Composio). Always search tools first for current schemas."

cold-call-prep

anthropics/claude-for-legal

>

cold-chain-risk-calculator

aipoch/medical-research-skills

Calculate temperature excursion risks for cold chain transport. Assesses route risk, packaging suitability, and monitoring requirements for biological samples and pharmaceuticals requiring controlled-temperature shipping.

cold-email

alirezarezvani/claude-skills

When the user wants to write, improve, or build a sequence of B2B cold outreach emails to prospects who haven't asked to hear from them. Use when the user mentions 'cold email,' 'cold outreach,' 'prospecting emails,' 'SDR emails,' 'sales emails,' 'first touch email,' 'follow-up sequence,' or 'email prospecting.' Also use when they share an email draft that sounds too sales-y and needs to be humanized. Distinct from email-sequence (lifecycle/nurture to opted-in subscribers) — this is unsolicited outreach to new prospects. NOT for lifecycle emails, newsletters, or drip campaigns (use email-sequence).

cold-email

coreyhaines31/marketingskills

Write B2B cold emails and follow-up sequences that get replies. Use when the user wants to write cold outreach emails, prospecting emails, cold email campaigns, sales development emails, or SDR emails. Also use when the user mentions "cold outreach," "prospecting email," "outbound email," "email to leads," "reach out to prospects," "sales email," "follow-up email sequence," "nobody's replying to my emails," or "how do I write a cold email." Covers subject lines, opening lines, body copy, CTAs, personalization, and multi-touch follow-up sequences. For warm/lifecycle email sequences, see emails. For sales collateral beyond emails, see sales-enablement.

cold-email-outreach

gooseworks-ai/goose-skills

>

cold-email-sequence-generator

OneWave-AI/claude-skills

Generate personalized cold email sequences (7-14 emails) with A/B test subject lines, follow-up timing recommendations, and integrated social proof. Creates multi-touch campaigns optimized for response rates. Use when users need outbound email campaigns, sales sequences, or lead generation emails.

cold-email-v2

diegosouzapw/awesome-omni-skills

Cold Email Writing workflow skill. Use this skill when the user needs Write B2B cold emails and follow-up sequences that earn replies. Use when creating outbound prospecting emails, SDR outreach, personalized opening lines, subject lines, CTAs, and multi-touch follow-up sequences and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.

cold-outreach

mkurman/zorai

When a founder needs to write cold emails or LinkedIn messages to prospects, partners, or investors. Activate when the user mentions cold email, outbound, prospecting, LinkedIn outreach, or needs help getting replies from people who don't know them.

cold-start

yogsoth-ai/de-anthropocentric-research-engine

Full crystallization strategy for users who have no research direction at all. Covers actor profiling, landscape reconnaissance, direction narrowing, obstacle analysis, goal decomposition, and north-star synthesis. Use when the user's first message reveals zero specificity about what they want to research.

cold-start-interview

anthropics/claude-for-legal

>

collab-proof

alirezarezvani/claude-skills

Use when you want to understand what Claude contributed vs what you drove in a session. Triggers on: /collab-proof, session retrospective, ai contribution analysis, collaboration evidence, what did claude do.

collaboration

aAAaqwq/AGI-Super-Team

Guide for collaborating on GitHub projects. This skill should be used when contributing to projects, creating PRs, reviewing code, or managing issues on GitHub.

collapse-pass

EpicenterHQ/epicenter

Run a continuous collapse-and-simplify pass that surgically removes indirection failing to earn its boundary. Use when the user says 'collapse pass', 'simplify pass', 'reduce indirection', 'shrink the surface', 'find what to delete', when asking to audit a package for dead abstractions, or when the goal is a sequence of small refactor commits that delete more than they add. Pairs with code-audit (smell catalog), refactoring (per-change mechanics), one-sentence-test (cohesion gate), cohesive-clean-breaks (deep redesigns), approachability-audit (first-read sanity), and post-implementation-review (second-read after each commit).

colleague-distillation

ZhixiangLuo/10xProductivity

Distill a colleague into a reusable AI skill (work + persona) using tool connections — Slack, Slack AI, Jira, GHE, Bitbucket, Confluence, SharePoint, Teams, Outlook, Notion, Linear, Google Docs, and more — without manual paste. Use when the user wants a colleague skill, digital twin of a coworker, or capture of someone's technical voice from workplace systems. Requires tool_connections + 10xProductivity verified_connections (or equivalent .env).

collecting-indicators-of-compromise

mukul975/Anthropic-Cybersecurity-Skills

>

collecting-open-source-intelligence

mukul975/Anthropic-Cybersecurity-Skills

>

collecting-threat-intelligence-with-misp

mukul975/Anthropic-Cybersecurity-Skills

MISP (Malware Information Sharing Platform) is an open-source threat intelligence platform for gathering, sharing, storing, and correlating Indicators of Compromise (IOCs) of targeted attacks, threat

collecting-volatile-evidence-from-compromised-host

mukul975/Anthropic-Cybersecurity-Skills

Collect volatile forensic evidence from a compromised system following order of volatility, preserving memory, network connections, processes, and system state before they are lost.

collective-adjudication

yogsoth-ai/de-anthropocentric-research-engine

Strategy for multi-judge ranking aggregation using Condorcet, Schulze, Borda, Kemeny-Young, and Copeland methods to produce consensus rankings from diverse perspectives.

college-football-data-automation

ComposioHQ/awesome-claude-skills

"Automate College Football Data tasks via Rube MCP (Composio). Always search tools first for current schemas."

Collision-Zone Thinking

obra/superpowers-skills

Force unrelated concepts together to discover emergent properties - "What if we treated X like Y?"

Collision-Zone Thinking

aAAaqwq/AGI-Super-Team

Force unrelated concepts together to discover emergent properties - "What if we treated X like Y?"

color-palette-extractor

OneWave-AI/claude-skills

Extract color palettes from images, websites, or designs. Identifies dominant colors, generates complementary schemes, and exports in multiple formats (HEX, RGB, HSL, Tailwind, CSS variables). Use when users need color schemes from images, brand colors, or design system palettes.

combination-evaluation

yogsoth-ai/de-anthropocentric-research-engine

Evaluate new combinations for feasibility and novelty

combination-mapping

yogsoth-ai/de-anthropocentric-research-engine

Systematically enumerate parameter dimensions and generate viable combinations. Orchestrates parameter extraction → value enumeration → compatibility assessment → synthesis.

combinatorial_chemistry

InternScience/scp

Combinatorial Chemistry Library Design - Design combinatorial library: validate core SMILES, generate variants, compute properties, and predict ADMET for library. Use this skill for combinatorial chemistry tasks involving is valid smiles calculate mol basic info calculate mol drug chemistry pred molecule admet. Combines 4 tools from 2 SCP server(s).

combinatorial-creativity

yogsoth-ai/de-anthropocentric-research-engine

Combinatorial Creativity Campaign — produce emergent concepts via concept blending, multi-level bisociation, and function combination (Fauconnier-Turner)

combinatorial-synthesis

yogsoth-ai/de-anthropocentric-research-engine

Synthesize all combinatorial creativity outputs

comet-ml

TerminalSkills/skills

Expert guidance for Comet ML, the platform for tracking machine learning experiments, managing models, and monitoring production ML systems. Helps developers log experiments, compare model versions, and build reproducible ML pipelines with automatic code/data versioning.

comfortletter-weich-erzeugen

Klotzkette/claude-fuer-deutsches-recht

Erzeugt einen Comfortletter — eine weiche Erklaerung des Patrons oder Mutterunternehmens das Tochterunternehmen zu unterstuetzen. Im Gegensatz zur harten externen Patronatserklaerung ist der Comfortletter nicht rechtsverbindlich durchsetzbar. Wirkung Reputation und Banken-Signal. Nicht ausreichend zur Beruecksichtigung im insolvenzrechtlichen Status nach § 19 Abs. 2 InsO. Skill erzeugt Dokument plus Warnhinweis dass der Comfortletter die Fortbestehensprognose nicht traegt.

comfyui

NousResearch/hermes-agent

Generate images, video, and audio with ComfyUI — install, launch, manage nodes/models, run workflows with parameter injection. Uses the official comfy-cli for lifecycle and direct REST/WebSocket API for execution.

comfyui-gateway

diegosouzapw/awesome-omni-skills

ComfyUI Gateway workflow skill. Use this skill when the user needs REST API gateway for ComfyUI servers. Workflow management, job queuing, webhooks, caching, auth, rate limiting, and image delivery (URL + base64) and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.

comfyui-gateway-v2

diegosouzapw/awesome-omni-skills

ComfyUI Gateway workflow skill. Use this skill when the user needs REST API gateway for ComfyUI servers. Workflow management, job queuing, webhooks, caching, auth, rate limiting, and image delivery (URL + base64) and the operator should preserve the upstream workflow, copied support files, and provenance before merging or handing off.

comm-lit-review-claude-single

wanshuiyin/Auto-claude-code-research-in-sleep

Communications-domain literature review with Claude-style knowledge-base-first retrieval. Use when the task is about communications, wireless, networking, satellite/NTN, Wi-Fi, cellular, transport protocols, congestion control, routing, scheduling, MAC/PHY, rate adaptation, channel estimation, beamforming, or communication-system research and the user wants papers, related work, a survey, or a landscape summary. Search Zotero, Obsidian, and local paper folders first when available, then search IEEE Xplore, ScienceDirect, ACM Digital Library, and broader web in that order.

Command Development

anthropics/claude-code

This skill should be used when the user asks to "create a slash command", "add a command", "write a custom command", "define command arguments", "use command frontmatter", "organize commands", "create command with file references", "interactive command", "use AskUserQuestion in command", or needs guidance on slash command structure, YAML frontmatter fields, dynamic arguments, bash execution in commands, user interaction patterns, or command development best practices for Claude Code.

command-injection-methodology

wgpsec/AboutSecurity

OS命令注入的检测、利用、盲注和输出绕过。当目标有Ping/Traceroute/DNS查询等网络工具、参数传入shell命令时使用。包含分隔符大全、输出过滤绕过策略、正则匹配伪造技巧

command-registry-integration

aAAaqwq/AGI-Super-Team

Integrate new chat commands into OpenClaw's formal command registry

commander

TerminalSkills/skills

>-

comment

TheBushidoCollective/han

Add a comment to a ClickUp task

comment-code-generate-a-tutorial

github/awesome-copilot

'Transform this Python script into a polished, beginner-friendly project by refactoring the code, adding clear instructional comments, and generating a complete markdown tutorial.'

comment-quality

notque/vexjoy-agent

Review and fix temporal references in code comments.

comment-review

jongwony/epistemic-protocols

Review markdown artifacts before fixation (publish/commit/deposit/merge) via /inquire × /gap × /contextualize through a channel-first browser preview loop. User-invoked via /comment-review.

Commenting Intent

obra/clank

Comment WHY code exists and non-obvious decisions, not WHAT code does (mechanics)