Fn2

FN2 AI research agents, from your assistant

This skill drives the public fn2.ai API so you can start, watch, and schedule FN2 AI research agents without leaving Claude, Codex, or Pi. It is a single, dependency-free Python 3 helper: standard library only, no pip install, no build step.

First run: connect an account (no secret copying)

Connecting is a browser device flow: the CLI prints a short code, the user enters it at https://fn2.ai/start and clicks Approve. Drive it in two steps so the user is never left watching a silent terminal. Resolve the helper first as described in Locating the helper.

Step 1 — get the code (instant, foreground).

python3 "$FN2" auth login --no-wait
# Open https://fn2.ai/start
# Enter code XXXX-XXXX
# (opened in your browser)

This starts (or resumes) a sign-in, prints the URL and code, opens the user's browser itself whenever the machine has a display, and exits immediately.

Step 2 — relay the code, then wait in the background. Tell the user the code and the URL in chat right away, e.g.:

> Your sign-in code is XXXX-XXXX. I opened https://fn2.ai/start — sign in > (or create an account) and approve the code there. If no tab appeared, click > the link.

Then run the finishing wait as a background task so the conversation is not blocked:

python3 "$FN2" auth login --no-browser    # resumes the same code, waits for approval

It completes the moment the user approves (codes live 15 minutes) and stores a scoped, revocable device credential: macOS Keychain when available, otherwise ~/.config/fn2/credentials.json with 0600 permissions. No key is ever pasted, printed, or sent to chat. Confirm with python3 "$FN2" auth status.

Two rules that matter more than the mechanics:

• Never run bare auth login as a blocking foreground command in an

assistant turn; it waits up to 15 minutes and hides the code exactly when the user needs it.

• Never make the user dig the code out of a task log. The code and URL go

into chat the moment Step 1 prints them.

Other notes:

• Interrupted? fn2 auth login resumes the same code until it expires

(15 minutes), then starts a fresh one.

• Check the connection any time: fn2 auth status. See what it can do:

fn2 permissions. Diagnose problems: fn2 doctor.

• Disconnect: fn2 auth logout (add --revoke to also kill the credential on

fn2). Credentials can also be revoked in the FN2 AI web app under Preferences → Developer → Connected Devices; revocation takes effect within a few minutes everywhere.

Locating the helper

The bundled helper lives at /scripts/fn2. There is no fn2 on PATH; always invoke it as python3 "$FN2". Resolve ` from the path of this loaded SKILL.md; do not assume the current working directory. Claude Code expands ${CLAUDESKILLDIR}` to this directory. The fallbacks cover a marketplace plugin install (whose directory carries the version, so it moves on every update) and standalone installs:

FN2_SKILL_DIR="${CLAUDE_SKILL_DIR:-}"
for d in "$FN2_SKILL_DIR" \
         $(ls -td "$HOME"/.claude/plugins/cache/*/*/*/skills/fn2 \
                  "${CODEX_HOME:-$HOME/.codex}"/plugins/cache/*/*/*/skills/fn2 \
                  2>/dev/null) \
         "$HOME/.claude/skills/fn2" \
         "${CODEX_HOME:-$HOME/.codex}/skills/fn2" "$HOME/.agents/skills/fn2" \
         "${HERMES_HOME:-$HOME/.hermes}/skills/fn2" "$(pwd)"; do
  [ -f "$d/scripts/fn2" ] && FN2="$d/scripts/fn2" && break
done
test -n "${FN2:-}" || { echo "fn2 helper not found" >&2; exit 1; }
python3 "$FN2" --help

ls -td puts the most recently installed copy first, so an upgraded plugin wins over a stale cached version.

Command cheatsheet

Agent arguments accept an id, an id prefix (the 8 characters agents prints), or a name; ambiguity is refused, never guessed.

python3 "$FN2" start "What did NVDA say about demand last call?" --wait   # ask and get the answer
python3 "$FN2" start "Summarize overnight moves in NVDA and peers"        # run once, now
python3 "$FN2" start "Pre-market brief on my watchlist" \
    --when "before market open"                                          # 30 min before each open (trading days only)
python3 "$FN2" start "Daily macro digest" --when "weekdays at 7am" --tz America/New_York
python3 "$FN2" start "One-time earnings recap" --when "before next market open"  # single future run
python3 "$FN2" start "EOD watchlist recap" --when "market close" --email  # + email each result to your account

python3 "$FN2" agents                     # list your agents
python3 "$FN2" status                     # same overview
python3 "$FN2" status           # detail + recent runs
python3 "$FN2" run  --wait      # trigger now, block until it finishes
python3 "$FN2" runs             # run history
python3 "$FN2" result           # newest run
python3 "$FN2" result   # a specific run

python3 "$FN2" pause 
python3 "$FN2" resume 
python3 "$FN2" schedule  "hourly"
python3 "$FN2" delete 

python3 "$FN2" auth login --no-wait       # start sign-in: print code + URL, open browser, return
python3 "$FN2" auth login --no-browser    # resume + wait for approval (run in background)
python3 "$FN2" auth status                # credential health + storage backend
python3 "$FN2" permissions                # what the credential can / cannot do
python3 "$FN2" doctor                     # local diagnostics
python3 "$FN2" auth logout --revoke       # disconnect + revoke on FN2 AI
python3 "$FN2" link                       # put an `fn2` launcher on the user's PATH

One-off questions. A prompt with no --when runs immediately. Use --wait so the answer comes back in the same command instead of making the user ask twice; it long-polls the API and honours --timeout (default 300s).

If the user wants to run fn2 themselves, offer python3 "$FN2" link. Installing the plugin puts nothing on PATH, so fn2 alone is command not found until that runs. The launcher it writes re-resolves the skill each time, so plugin updates do not break it.

Add --json to any command for machine-readable output.

Reading results

Results are available via fn2 result and in the fn2 web app. Add --email to start to also deliver each completed run to your account's own verified email: the server resolves the address and honors your opt-out; the skill never sends a recipient. Broader delivery options (extra channels, per-condition rules) live in the web app.

Scheduling vocabulary

--when understands: daily, weekdays, hourly, before market open, market close, weekdays at 8:30am, daily 16:00, in 2 hours, tomorrow at 9am, an ISO time like 2026-07-22T13:00, or a raw cron:0 9 * * 1-5. Market phrases resolve against the exchange calendar server-side (America/New_York), so a run skips holidays and half-days and lands 30 min before the open / 5 min after the close. See [references/scheduling.md](references/scheduling.md).

Advanced / CI: headless credential

For CI or containers where a browser flow is impossible, set the environment variable FN2_API_TOKEN (accepts a device token fn2d_… or an API key fn2_…). It is the only headless override; FN2_API_KEY remains as a legacy alias. There is no .env support.

A manual API key still works as a fallback: create one in the FN2 AI web app (Preferences → Developer, needs the agents scope) and run fn2 login --token fn2_…. Prefer fn2 auth login everywhere else.

Safety

• Never paste a credential into chat, argv, or a commit. All output, including

--json and error text, shows only a masked fn2d_…wxyz form.

• The API base is pinned to https://fn2.ai / *.fn2.ai; the credential is

never sent anywhere else.

• delete is irreversible (removes the agent and its history). Confirm the

agent id with status first; pass --yes only when the user is explicit.

• Prefer read-only verbs (agents, status, runs, result) before creating

or destroying anything.

References

• [references/api.md](references/api.md): the endpoint contract this skill maps to.
• [references/scheduling.md](references/scheduling.md): cadence phrases and calendar caveats.
• [references/troubleshooting.md](references/troubleshooting.md): auth, storage, quota, and network errors.

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: fn2ai
• Source: fn2ai/fn2-skill
• License: MIT
• Homepage: https://fn2.ai

Install and usage instructions live in the source repository linked above.