fa

fa is a skill for Claude Code, Codex from tonydzi/second-brain-starter-kit. It costs 126 tokens per session (3,365 once invoked), scanned A, original, MIT.

A follow-up writing workflow for after a one-to-one call, based on the call transcript, the person's details, and previous correspondence. It writes the message in the owner's established personal voice.

In plain words
What is it for?
Use it to draft a concise post-call follow-up after an existing relationship or conversation.
Why use it?
It turns a recent conversation into one clear next step while the discussion is still fresh. It helps confirm responsibilities, deadlines, and an unanswered question without sending meeting minutes.

Skill for Claude CodeCodex

Part of the second-brain-skills plugin — 57 skills shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/tonydzi/second-brain-starter-kit/fa
Any agent
npx skills add tonydzi/second-brain-starter-kit --skill fa
Clone the repo
git clone --depth 1 https://github.com/tonydzi/second-brain-starter-kit

Made for: Claude Code, Codex.

Or install second-brain-skills, the plugin that ships this one along with the rest of its 57 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for fa

README.md
[![agentmods](https://agentmods.dev/badge/skills/tonydzi/second-brain-starter-kit/fa.svg)](https://agentmods.dev/skills/tonydzi/second-brain-starter-kit/fa)
Your own site
<a href="https://agentmods.dev/skills/tonydzi/second-brain-starter-kit/fa"><img src="https://agentmods.dev/badge/skills/tonydzi/second-brain-starter-kit/fa.svg" alt="Measured on agentmods" height="20"></a>
Per session 126 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,365 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00126 $0.03365
Opus 5 $0.00063 $0.01682
Sonnet 5 $0.00025 $0.00673
Haiku 4.5 $0.00013 $0.00336

Measured 3d ago against content hash 3145ae156a3a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

fa scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/fa/SKILL.md · 167 lines

How it starts

The opening of the file, as written. The whole thing — 167 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/fa — the post-call follow-up in the owner's voice

🧒 When reporting to a non-technical owner: finish with an "In plain words" block ([[eli5-always]]). Only in the message TO him — it never goes inside the follow-up itself.

Why: after a call a person stays warm for a few hours, no more. A follow-up is not the minutes of a meeting, it is one short move that advances the deal: prove you listened → lock down who does what and by when → ask a question that cannot be left unanswered.

Boundary vs neighbors: /intro = introducing two people; /telegram-lead-outreach = a cold first contact; /fa = after an actual call with someone who already knows you.


§1. The owner's voice — derived from 17 of his real messages (June–July 2026)

Source: his personal/default DMs + the 🤝 groups ": 1-on-1 with Tony", and the calls archive chat (<YOUR_CHAT_ID>).

How he writes with his own hand (four sampled threads, 06-26 to 07-27):

  • lowercase, straight from the first line, no "Dear" and no "Hello sir";
  • short paragraphs separated by a blank line, 1–3 lines each;
  • colloquial contractions and live little words: "v much", "no worries", "fellow countryman!", "+++", "..." instead of a period;
  • a hyphen -, never an em dash , and definitely no "— Palo Alto AI Research Lab" as a signature;
  • informal address, by first name, from the very first word;
  • specifics instead of politeness: he names the artifact, gives the link, sets the date;
  • honesty as a move: he volunteers what he does not have ("we have no latency numbers") — that is his signature trait, always keep it;
  • ends with a question or a proposed exchange, never with "looking forward to your feedback";
  • 0–2 emoji per message, on point (🙂 🙌), never in rows and never in a header.

The mandatory frame of a new follow-up (5 blocks, 60–120 words):

  1. the hook — one phrase proving you listened: his own thought/number/detail that he himself said. Not a summary, but "this is what stuck".
  2. what I did — something already done, with a link/fact. Past tense, not "I'll follow up shortly".
  3. what's on you — exactly one item, in his own words, with a deadline.
  4. the date of the next step — a concrete day and time, not "sometime this week".
  5. one open question — as the last line, so that an answer is obliged to come.

Read the full file on GitHub · 167 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 167 lines · 126 tokens per session scan A 3145ae156a3a

Subscribe to this mod's changes

fa is a skill published in the GitHub repository tonydzi/second-brain-starter-kit (5 stars, last pushed 4d ago), licensed MIT. It adds 126 tokens to every session and 3,365 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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