Finding Experiments
PostHog/posthog
Resolves a PostHog experiment reference from natural language to a concrete experiment ID by browsing experiment-list (not feature-flag tools), with disambiguation when multiple experiments match.
Install + verify ax (the agent experience layer). An agent skill from Necmttn/ax.
$ npx skills add Necmttn/ax --skill setup -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install Necmttn/ax setup --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/Necmttn/ax.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/setup .claude/skills/setup && rm -rf skills-srcUse ~/.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/
Install the "setup" agent skill from https://github.com/Necmttn/ax/tree/main/skills/setup into .claude/skills/setup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "setup", 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 install https://github.com/Necmttn/ax/tree/main/skills/setupType 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.
$ npx skills add Necmttn/ax --skill setup -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install Necmttn/ax setup --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Necmttn/ax.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/setup .agents/skills/setup && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "setup" agent skill from https://github.com/Necmttn/ax/tree/main/skills/setup into .agents/skills/setup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "setup", 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.
$ npx skills add Necmttn/ax --skill setup -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install Necmttn/ax setup --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Necmttn/ax.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/setup .cursor/skills/setup && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "setup" agent skill from https://github.com/Necmttn/ax/tree/main/skills/setup into .cursor/skills/setup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "setup", 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 https://github.com/Necmttn/ax.git --path skills/setup--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add Necmttn/ax --skill setup -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install Necmttn/ax setup --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Necmttn/ax.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/setup .gemini/skills/setup && rm -rf skills-srcUse ~/.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/
Install the "setup" agent skill from https://github.com/Necmttn/ax/tree/main/skills/setup into .gemini/skills/setup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "setup", 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.
$ gh skill install Necmttn/ax setupInstalls 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).
$ npx skills add Necmttn/ax --skill setup -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/Necmttn/ax.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/setup .github/skills/setup && rm -rf skills-srcUse ~/.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/
Install the "setup" agent skill from https://github.com/Necmttn/ax/tree/main/skills/setup into .github/skills/setup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "setup", 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.
$ npx skills add Necmttn/ax --skill setup -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install Necmttn/ax setup --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/Necmttn/ax.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/setup .opencode/skills/setup && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "setup" agent skill from https://github.com/Necmttn/ax/tree/main/skills/setup into .opencode/skills/setup/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "setup", 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.
setupInstall + verify ax (the agent experience layer). An agent skill from Necmttn/ax.
Setup is an agent skill from Necmttn/ax. Install + verify ax (the agent experience layer). Triggers when the user says "install ax", "set up ax", "ax not found", "ax doctor", "is ax running", "fix ax install", "first-time ax setup", or any setup question about the ax CLI / skills / daemon. Walks the install via the install.sh + skills.sh + first ingest, validates with ax doctor, and points the user at ax:retro (experiment loop) and ax:extract-workflow (reconstruct workflow behind shipped artifacts).
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.
The repository describes itself as: the agent experience layer · observability + memory for AI coding agents (Claude Code + Codex) · local-first, typed, yours. The licence is AGPL-3.0.
3 steps, taken from the first numbered list in SKILL.md.
Read from SKILL.md and the folder at commit fca259c. It shows what the files ask for, not the result of running them.
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.
Shell commands in SKILL.md call:
npxcurlFrom the folder's file list and the shell code blocks in SKILL.md.
No URLs in SKILL.md. Its commands use npx and curl, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Setup loads about 2k tokens when it runs. Until then it costs about 118 tokens; SKILL.md has 766 words of instructions outside code blocks.
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.
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.
The full file from Necmttn/ax at commit fca259c, republished under its AGPL-3.0 licence (© Necmttn). 766 words, ~1,962 tokens.
.claude/skills/setup/SKILL.md (or your agent's skills folder).Install and verify ax - the local agent-experience graph. After this skill
the user has the ax CLI on PATH, an ingested local graph (embedded DuckDB,
no daemon to run or watch), and the ax skills loaded into Claude Code.
This skill is intentionally narrow: install + verify only. For day-to-day
use see ax:retro (experiment loop), ax:extract-workflow (reconstruct
the recipe behind a shipped artifact), or run the CLI directly.
Trigger phrases:
Do NOT auto-trigger on unrelated work or when the user is already deep in
an ax workflow (ax improve list, ax recall …).
# 1. Download the installer and inspect it before executing. Review the target
# paths first; this repository does not publish a checksum for install.sh.
(
set -eu
ax_install_dir="$(mktemp -d "${TMPDIR:-/tmp}/ax-install.XXXXXXXX")"
trap 'rm -f "$ax_install_dir/install.sh"; rmdir "$ax_install_dir"' EXIT
curl -fsSL https://raw.githubusercontent.com/Necmttn/ax/main/install.sh -o "$ax_install_dir/install.sh"
less "$ax_install_dir/install.sh"
read -r -p "Execute this installer? [y/N] " answer
case "$answer" in
[yY][eE][sS]|[yY]) bash "$ax_install_dir/install.sh" ;;
*) echo "Installer not run."; exit 1 ;;
esac
)Continue only after the installer completes successfully. A failed download, failed review command, declined approval, or end of input stops installation. Agents inspect the downloaded file and obtain approval before executing that same file. The private directory prevents another local user replacing it.
# 2. Review the skill changes and confirm before installing into the selected
# agent skill directory. Omit -g unless a global install is intentional.
npx skills add Necmttn/ax -a codex
# 3. First ingest - seeds the graph from the user's last 7 days of
# Claude Code + Codex transcripts.
PATH="$HOME/.local/bin:$PATH" ax ingest --since=7If any step fails, run ax doctor --json and surface the blocker. If
ax itself isn't found after step 1, the user probably has a custom
shell rc - tell them to add $HOME/.local/bin to PATH.
ax --version # expect axctl v0.1.x
ax doctor --json # expect ok: true for cache + skills
ax skills taste --limit=5 # rank top skills - proof the graph populatedSpecific failure modes:
cache check fails / no successful ingest recorded → run ax ingest.
There is no daemon to start - the graph is a published DuckDB snapshot,
rebuilt on demand. A stale graph also self-heals: any DB-backed command
forks a debounced background ax ingest on its own (AX_NO_AUTO_INGEST=1
to opt out).AX_TRANSCRIPTS_DIR and re-ingest.ax tags skills with roles (e.g. framing, execution, verification) so
ax skills weighted ranks by usage × role, not raw count. A skill the user
invokes ≥3× with no role is "unclassified" - ax hands each one back to YOU as a
task brief to fill. This is the core agent-in-the-loop step; don't skip it.
ax skills classify # writes .ax/tasks/classify-<skill>.md per unclassified skillFor each brief written:
primary_role: (required,
one label), plus optional secondary:, confidence: (0–1), rationale:.
Run ax roles to see labels already in use; reuse them when they fit.ax skills lint # reads filled briefs → writes plays_role edges
ax skills weighted # the re-ranked list, now role-weightedIf classify reports "no unclassified skills", the user hasn't used enough yet -
say so and revisit after a few days (re-run ax ingest, or let the
freshness drive top it up automatically). One-off override without a brief:
ax skills tag <skill> <role>.
Also surface the config front door when relevant:
ax skills config - skill lifecycle (live / orphan / out-of-scope / parked).ax hooks config - hooks across claude/cursor/codex/opencode (+ add/remove/edit).ax hooks init - scaffold ~/.ax/hooks for authoring custom TypeScript guards (defineHook from @ax/hooks-sdk); validate with ax hooks backtest before ax hooks install.ax agents config - agent definitions and the skills they scope.After the first ingest completes, show the user where their model spend goes - this is the fastest "aha" in the product:
ax cost split --days=7 # main loop vs subagents, by model
ax dispatches --candidates # dispatches that could run on cheaper modelsIf the candidates list is non-empty, point at the routing loop: the
efficient-dispatch skill (installed with the others), the route-dispatch
hook (ax hooks init scaffolds it; install with
ax hooks install ~/.ax/hooks/route-dispatch.ts --providers=claude), and
docs/design/cost-routing.md for the full picture.
| Component | Where | Owner |
|---|---|---|
ax / axctl CLI | ~/.local/bin/ax (symlink to ~/.local/share/ax/bin/axctl) | install.sh |
| DuckDB cache | ~/.local/share/ax/ (embedded, no daemon to run or watch) | ax ingest |
| Freshness drive | forks a debounced background ax ingest when the graph is stale | automatic, on any DB-backed command |
| OTLP receiver (optional, macOS) | com.necmttn.ax-otlpd LaunchAgent | ax install --telemetry |
| Claude skills | ax:setup (this one), ax:retro (experiment loop), ax:extract-workflow (recipe reconstruction), ax:release-announcement (release notes from git + session evidence) | npx skills add Necmttn/ax |
To run the experiment loop:
let's do an ax retro
That fires ax:retro which walks the user through proposal triage +
verdict review against their recent work.
For ad-hoc queries the CLI is direct:
ax skills taste --limit=10 # most-used skills (with clean-run boost)
ax recall "auth middleware" # cross-session text search
ax insights tools --limit=5 # tool-failure leaderboard
ax project context --json # grounding for the current repo~/.local/share/ax/. No telemetry leaves the box.ax uninstall --purgeax:retro.ax:extract-workflow.ax:release-announcement.docs/development.md in
the repo.© Necmttn, AGPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Just SKILL.md in skills/setup of Necmttn/ax.
Open the folder on GitHubat commit fca259c
Setup 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Setup this skillNecmttn/ax | 116 | — | ~2k | Automated safety check: Pass | AGPL-3.0 | |
| Finding ExperimentsPostHog/posthog | 40k | — | ~783 | Automated safety check: Pass | Custom licence | |
| ExperimentsArize-ai/phoenix | 12k | — | ~1.8k | Automated safety check: Pass | Custom licence | |
| Scroll Experiencesickn33/agentic-awesome-skills | 47k | 2 repos | ~534 | Automated safety check: Pass | MIT | |
| Webgl Experiencenexu-io/open-design | 100k | — | ~903 | Automated safety check: Pass | Apache-2.0 | |
| Creating ExperimentsPostHog/posthog | 40k | — | ~2.7k | Automated safety check: Pass | Custom licence |
PostHog/posthog
Resolves a PostHog experiment reference from natural language to a concrete experiment ID by browsing experiment-list (not feature-flag tools), with disambiguation when multiple experiments match.
Arize-ai/phoenix
Run, read, and compare dataset-backed experiments to find evidence that a prompt or pipeline is improving.
sickn33/agentic-awesome-skills
Expert in building immersive scroll-driven experiences - parallax storytelling, scroll animations, interactive narratives, and cinematic web experiences.
nexu-io/open-design
A full-screen, real-time WebGL/WebGL2 experience — animated shaders, 3D scenes, generative visuals, particle fields — rendered live on the GPU with a typographic overlay.
PostHog/posthog
Guides agents through experiment creation: reading the project's setup with experiment-setup-context, defining the hypothesis, configuring rollout and bucketing, setting up analytics and running…
davila7/claude-code-templates
Expert in building immersive scroll-driven experiences - parallax storytelling, scroll animations, interactive narratives, and cinematic web experiences.
Necmttn/ax
Retrospective on one coding session that proposes changes to the agent's environment (hooks, checks, steering files, tool access) and files each as an ax proposal.
Necmttn/ax
Write the agent-generated narration of the current session - the reviewable story of what changed, including what never reaches a PR (user corrections, abandoned attempts, tool failures).
Necmttn/ax
Star the ax repo, file an issue / bug report, or fork-and-open-a-PR against github.com/Necmttn/ax on the user's behalf, by shelling out to the gh CLI.
Necmttn/ax
Draft or revise ax release announcements and website changelog pages.
Necmttn/ax
Guided experiment-loop retrospective over the ax agent-experience graph.
Necmttn/ax
Deep retro of retros - investigation pass that surfaces improvements across older retros and the current ax setup.
Install + verify ax (the agent experience layer). An agent skill from Necmttn/ax. Setup is an agent skill from Necmttn/ax. Install + verify ax (the agent experience layer).
Setup fits situations like: the user says install ax; first-time ax setup; any setup question about the ax CLI / skills / daemon.
Run `npx skills add Necmttn/ax --skill setup -a claude-code`. Or copy the skill folder (skills/setup in Necmttn/ax) into .claude/skills/setup in your project. Claude Code loads it when a task matches its description.
Run `npx skills add Necmttn/ax --skill setup -a codex`. Or copy the skill folder (skills/setup in Necmttn/ax) into .agents/skills/setup in your project. Codex loads it when a task matches its description.
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Necmttn/ax --skill setup -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/setup, .gemini/skills/setup, .github/skills/setup and .opencode/skills/setup in your project.
Going by SKILL.md and its folder, Setup needs the command-line tools its instructions call (npx and curl). Our summary lists: Node.js.
SKILL.md contains no URLs. Its commands use npx and curl, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
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.
Setup is published under the AGPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
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.
Skills that share tags, products or a category with Setup: Finding Experiments (PostHog/posthog, 40k stars), Experiments (Arize-ai/phoenix, 12k stars), Scroll Experience (sickn33/agentic-awesome-skills, 47k stars) and Webgl Experience (nexu-io/open-design, 100k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Necmttn (a GitHub user) maintains it in Necmttn/ax, which has 116 GitHub stars. The repository holds 12 skills in this directory. The repository was last updated on October 7, 2026.
Source: Necmttn/ax on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.