Agent skill

Evanflow TDD

Vertical-slice TDD for any production code. An agent skill from evanklem/evanflow.

Custom licenceAuto-check passedTesting & QA

Install Evanflow TDD

skills CLI

$ npx skills add evanklem/evanflow --skill evanflow-tdd -a claude-code

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

GitHub CLI

$ gh skill install evanklem/evanflow evanflow-tdd --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/evanklem/evanflow.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/evanflow-tdd .claude/skills/evanflow-tdd && 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 "evanflow-tdd" agent skill from https://github.com/evanklem/evanflow/tree/main/skills/evanflow-tdd into .claude/skills/evanflow-tdd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "evanflow-tdd", 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/evanklem/evanflow/tree/main/skills/evanflow-tdd

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 evanklem/evanflow --skill evanflow-tdd -a codex

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

GitHub CLI

$ gh skill install evanklem/evanflow evanflow-tdd --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/evanklem/evanflow.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/evanflow-tdd .agents/skills/evanflow-tdd && 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 "evanflow-tdd" agent skill from https://github.com/evanklem/evanflow/tree/main/skills/evanflow-tdd into .agents/skills/evanflow-tdd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "evanflow-tdd", 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 evanklem/evanflow --skill evanflow-tdd -a cursor

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

GitHub CLI

$ gh skill install evanklem/evanflow evanflow-tdd --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/evanklem/evanflow.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/evanflow-tdd .cursor/skills/evanflow-tdd && 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 "evanflow-tdd" agent skill from https://github.com/evanklem/evanflow/tree/main/skills/evanflow-tdd into .cursor/skills/evanflow-tdd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "evanflow-tdd", 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/evanklem/evanflow.git --path skills/evanflow-tdd

--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 evanklem/evanflow --skill evanflow-tdd -a gemini-cli

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

GitHub CLI

$ gh skill install evanklem/evanflow evanflow-tdd --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/evanklem/evanflow.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/evanflow-tdd .gemini/skills/evanflow-tdd && 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 "evanflow-tdd" agent skill from https://github.com/evanklem/evanflow/tree/main/skills/evanflow-tdd into .gemini/skills/evanflow-tdd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "evanflow-tdd", 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 evanklem/evanflow evanflow-tdd

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 evanklem/evanflow --skill evanflow-tdd -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/evanklem/evanflow.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/evanflow-tdd .github/skills/evanflow-tdd && 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 "evanflow-tdd" agent skill from https://github.com/evanklem/evanflow/tree/main/skills/evanflow-tdd into .github/skills/evanflow-tdd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "evanflow-tdd", 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 evanklem/evanflow --skill evanflow-tdd -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 evanklem/evanflow evanflow-tdd --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/evanklem/evanflow.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/evanflow-tdd .opencode/skills/evanflow-tdd && 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 "evanflow-tdd" agent skill from https://github.com/evanklem/evanflow/tree/main/skills/evanflow-tdd into .opencode/skills/evanflow-tdd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "evanflow-tdd", 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: evanflow-tdd
GitHub stars: 418
Token cost: ~2k tokens
SKILL.md length: 978 words
Files: 1
Skills in repo: 14
Repo updated: May 13, 2026
First seen: Oct 7, 2026
Licence: Custom licence

At a glance

Vertical-slice TDD for any production code. An agent skill from evanklem/evanflow.

Works in 5 steps: Embedded Grill — "What to Test" → Tracer Bullet → Incremental Loop → …
Implementing any feature
SKILL.md covers Vocabulary, Core Principle, Anti-Pattern: Horizontal Slices and When to Use, plus 6 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Evanflow TDD is an agent skill from evanklem/evanflow. Vertical-slice TDD for any production code. One test → one impl → repeat. Tests verify behavior through public interfaces, not internals. Use when implementing any feature, bugfix, or behavior change.

Its SKILL.md is about 2k 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 Testing & QA, covering Test-driven development. The repository describes itself as: A TDD-driven iterative feedback loop for software development. 16 cohesive Claude Code skills walk an idea from brainstorm → plan → execute → iterate, with checkpoints throughout.

When your agent uses it

Implementing any feature
Behavior change

Example prompts

“/evanflow-tdd”

Workflow steps

5 steps, taken from the step headings in SKILL.md.

Embedded Grill — "What to Test"
Tracer Bullet
Incremental Loop
Per-Cycle Refactor Checklist
Macro Refactor (deferred to evanflow-iterate)

What it can do on your machine

Read from SKILL.md and the folder at commit c9ae21f. 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

Evanflow TDD loads about 2k tokens when it runs. Until then it costs about 53 tokens; SKILL.md has 978 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~53
When it runs · the whole SKILL.md, loaded when a task matches: ~2k

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

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 978 words (~1,952 tokens).

“See evanflow meta-skill. Key terms: vertical slice, behavior through public interface, deep module.”

— opening of SKILL.md by evanklem, Custom licence

name: evanflow-tdd

Read the full SKILL.md on GitHub

Files

Just SKILL.md in skills/evanflow-tdd of evanklem/evanflow.

Open the folder on GitHubat commit c9ae21f

Compare with similar skills

Evanflow TDD 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.

Evanflow TDD compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Evanflow TDD this skillevanklem/evanflow	418	—	~2k	Automated safety check: Pass	Custom licence	4 mo ago
TDDpietheinstrengholt/rssmonster	564	30 repos	~906	Automated safety check: Pass	MIT	yesterday
TDD WorkflowhellangleZ/burn-in-cceverywhere-ralph	112	11 repos	~2.4k	Automated safety check: Pass	None	8 mo ago
TDDsanity-io/sanity	6.4k	20 repos	~1k	Automated safety check: Pass	MIT	yesterday
Test Driven Developmentfarm-fe/farm	5.6k	51 repos	~2.5k	Automated safety check: Pass	MIT	16 days ago
Tapd Story PipelineTencentBlueKing/bk-bcs	840	—	~2.6k	Automated safety check: Pass	Custom licence	yesterday

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Questions about Evanflow TDD

What does Evanflow TDD do?

Vertical-slice TDD for any production code. An agent skill from evanklem/evanflow. Evanflow TDD is an agent skill from evanklem/evanflow. Vertical-slice TDD for any production code.

When should I use Evanflow TDD?

Evanflow TDD fits situations like: implementing any feature; behavior change.

How do I install Evanflow TDD in Claude Code?

Run `npx skills add evanklem/evanflow --skill evanflow-tdd -a claude-code`. Or copy the skill folder (skills/evanflow-tdd in evanklem/evanflow) into .claude/skills/evanflow-tdd in your project. Claude Code loads it when a task matches its description.

How do I install Evanflow TDD in Codex?

Run `npx skills add evanklem/evanflow --skill evanflow-tdd -a codex`. Or copy the skill folder (skills/evanflow-tdd in evanklem/evanflow) into .agents/skills/evanflow-tdd in your project. Codex loads it when a task matches its description.

Can I use Evanflow TDD 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 evanklem/evanflow --skill evanflow-tdd -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/evanflow-tdd, .gemini/skills/evanflow-tdd, .github/skills/evanflow-tdd and .opencode/skills/evanflow-tdd in your project.

What does Evanflow TDD need to run?

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

Does Evanflow TDD 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 Evanflow TDD 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 Evanflow TDD use?

Evanflow TDD has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Evanflow TDD use?

About 2k tokens (SKILL.md is roughly 7.8k 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 Evanflow TDD?

Skills that share tags, products or a category with Evanflow TDD: TDD (pietheinstrengholt/rssmonster, 564 stars), TDD Workflow (hellangleZ/burn-in-cceverywhere-ralph, 112 stars), TDD (sanity-io/sanity, 6.4k stars) and Test Driven Development (farm-fe/farm, 5.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Evanflow TDD?

evanklem (a GitHub user) maintains it in evanklem/evanflow, which has 418 GitHub stars. The repository holds 14 skills in this directory. The repository was last updated on May 13, 2026.

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

Evanflow TDD

Install Evanflow TDD

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

TDD

TDD Workflow

TDD

Test Driven Development

Tapd Story Pipeline

Absolute Init

More from evanklem/evanflow

Evanflow

Evanflow Coder Overseer

Evanflow Glossary

Evanflow Prd

Evanflow QA

Evanflow Compact

Questions about Evanflow TDD

Install Evanflow TDD

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Files

Compare with similar skills

Similar skills

More from evanklem/evanflow

Related

Questions about Evanflow TDD