A method for documenting a person’s or brand’s writing style from real examples and reusing it in later content.

Use it when writing posts, emails, launch notes, product updates, or other content that should match an existing voice.

It reduces generic-sounding writing and avoids repeatedly analysing the same voice from scratch.

brand-voice — Skill for Codex by Fmarzochi

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.

Any agent

npx skills add Fmarzochi/EGC --skill brand-voice

Clone the repo

git clone --depth 1 https://github.com/Fmarzochi/EGC

Made for: Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/fmarzochi/egc/brand-voice/github.svg)](https://agentmods.dev/skills/fmarzochi/egc/brand-voice)

Your own site

<a href="https://agentmods.dev/skills/fmarzochi/egc/brand-voice"><img src="https://agentmods.dev/badge/skills/fmarzochi/egc/brand-voice/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/fmarzochi/egc/brand-voice"><img src="https://agentmods.dev/badge/skills/fmarzochi/egc/brand-voice.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 53 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 776 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin 95% copy Near-identical to another mod 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.

Model	Per session	Once invoked
Fable 5.1	$0.00053	$0.00776
Opus 5	$0.00026	$0.00388
Sonnet 5	$0.00011	$0.00155
Haiku 4.5	$0.00005	$0.00078

Measured 11d ago against content hash 80644dabcbe2, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

brand-voice 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 11d 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.

Origin

This is a copy

95% identical to brand-voice — 6 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/brand-voice/SKILL.md · 97 lines

How it starts

The opening of the file, as written. The whole thing — 97 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Brand Voice

Build a durable voice profile from real source material, then use that profile everywhere instead of re-deriving style from scratch or defaulting to generic AI copy.

When to Activate

the user wants content or outreach in a specific voice
writing for X, LinkedIn, email, launch posts, threads, or product updates
adapting a known author's tone across channels
the existing content lane needs a reusable style system instead of one-off mimicry

Source Priority

Use the strongest real source set available, in this order:

recent original X posts and threads
articles, essays, memos, launch notes, or newsletters
real outbound emails or DMs that worked
product docs, changelogs, README framing, and site copy

Do not use generic platform exemplars as source material.

Collection Workflow

Gather 5 to 20 representative samples when available.
Prefer recent material over old material unless the user says the older writing is more canonical.
Separate "public launch voice" from "private working voice" if the source set clearly splits.
If live X access is available, use x-api to pull recent original posts before drafting.
If site copy matters, include the current EGC landing page and repo/plugin framing.

What to Extract

rhythm and sentence length
compression vs explanation
capitalization norms
parenthetical use
question frequency and purpose
how sharply claims are made
how often numbers, mechanisms, or receipts show up
how transitions work
what the author never does

Output Contract

Produce a reusable VOICE PROFILE block that downstream skills can consume directly. Use the schema in references/voice-profile-schema.md.

Keep the profile structured and short enough to reuse in session context. The point is not literary criticism. The point is operational reuse.

Felipe / EGC Defaults

If the user wants Felipe / EGC voice and live sources are thin, start here unless newer source material overrides it:

Read the full file on GitHub · 97 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

11d ago First seen · 97 lines · 53 tokens per session scan A 80644dabcbe2

Subscribe to this mod's changes

brand-voice is a skill published in the GitHub repository Fmarzochi/EGC (51 stars, last pushed yesterday), licensed Apache-2.0. It adds 53 tokens to every session and 776 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. It is 95% identical to brand-voice, differing in 6 lines, and is treated as a copy.

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