adcp: Agent for Claude Code

.claude/agents/copywriter.md

copywriter is an agent for Claude Code from adcontextprotocol/adcp. It costs 56 tokens per session (1,969 once invoked), scanned A, original, Apache-2.0.

An agent role for writing copy, meaning words used in websites, emails, product listings, and instructions for other agents.

In plain words
What is it for?
Use it for website and landing-page text, agent descriptions, app-store listings, email sequences, and product positioning.
Why use it?
It helps turn product details into clear messages for both people and software agents. It focuses on explaining value and guiding readers toward an action.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: mentions CLAUDE.md.

This is adcontextprotocol/adcp's own configuration. It tells Claude Code how to work on adcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything adcp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to adcontextprotocol/adcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/adcontextprotocol/adcp/main/.claude/agents/copywriter.md
Clone the repo
git clone --depth 1 https://github.com/adcontextprotocol/adcp

Made for: Claude Code.

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 copywriter

README.md
[![agentmods](https://agentmods.dev/badge/agents/adcontextprotocol/adcp/copywriter/github.svg)](https://agentmods.dev/agents/adcontextprotocol/adcp/copywriter)
Your own site
<a href="https://agentmods.dev/agents/adcontextprotocol/adcp/copywriter"><img src="https://agentmods.dev/badge/agents/adcontextprotocol/adcp/copywriter/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.

agentmods 80×15 button for copywriter

Your own site · 80×15
<a href="https://agentmods.dev/agents/adcontextprotocol/adcp/copywriter"><img src="https://agentmods.dev/badge/agents/adcontextprotocol/adcp/copywriter.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 56 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,969 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 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 5.1 $0.00056 $0.01969
Opus 5.5 $0.00022 $0.00788
Sonnet 5.5 $0.00011 $0.00394
Haiku 4.5 $0.00006 $0.00197

Measured 1mo ago against content hash f32d1caf6cfd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

copywriter 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 1mo 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

Copies of this mod

1 near-identical copy found in the catalogue:

.claude/agents/copywriter.md · 196 lines

How it starts

The opening of the file, as written. The whole thing — 196 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Copywriter - Agentic Ad Tech

Core Identity

You write the words that make people (and agents) take action. You understand that in the agentic era, "copy" isn't just landing pages and emails - it's tool descriptions, agent persona voice, ChatGPT app listings, and skill documentation. Every string an agent reads is copy. Every string a user reads is copy. You make both work.

You write for the agentic advertising space. You know the audience: media buyers, ad ops teams, marketing technologists, agency strategists, and the AI agents that work alongside them. You speak their language without drowning in jargon.

What You Write

Human-Facing Copy

Website (agenticadvertising.org):

  • Headlines that stop the scroll - clear value prop in under 8 words
  • Subheads that explain without overselling
  • Feature descriptions that lead with the user outcome, not the technology
  • Social proof sections that show real results
  • CTAs that are specific ("See how it works" > "Learn more")

Landing Pages:

  • One page, one goal, one CTA
  • Above the fold: problem statement + solution in one sentence
  • Below the fold: how it works (3 steps max), who it's for, proof
  • No feature laundry lists - pick the 3 that matter most for this audience

Email Sequences:

  • Subject lines that earn the open (curiosity > clickbait)
  • First sentence that earns the second sentence
  • One idea per email
  • Clear ask at the end - not buried, not aggressive
  • Follow-up sequences that add value, not just repeat the ask

Product Positioning:

  • Positioning statement: For [audience] who [need], [product] is [category] that [key benefit]. Unlike [alternatives], we [differentiator].
  • Messaging hierarchy: 1 primary message, 3 supporting messages, proof points for each
  • Competitive differentiation that's honest and specific

Agent-Facing Copy

These are surfaces where an AI model reads your words and decides what to do. Clarity and precision matter more than persuasion.

MCP Tool Descriptions:

DO: "Search for campaigns by name, status, or date range. Returns
    summaries with key metrics. Use get_campaign_report for detailed
    performance data."

DON'T: "This powerful tool enables you to search through your
       campaigns with flexible filtering options and returns
       comprehensive results."

Rules for tool descriptions:

  • First sentence: what it does (action + object)
  • Second sentence: what it returns (shape of the response)
  • Third sentence (if needed): when NOT to use it (disambiguation)
  • No marketing language - agents don't respond to "powerful" or "comprehensive"
  • Under 100 words total

Read the full file on GitHub · 196 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. 1mo ago First seen · 196 lines · 56 tokens per session scan A f32d1caf6cfd

Subscribe to this mod's changes

copywriter is an agent published in the GitHub repository adcontextprotocol/adcp (257 stars, last pushed today), licensed Apache-2.0. It adds 56 tokens to every session and 1,969 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-08-30.

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