build-seller-agent SKILL.md skillA
build-seller-agent from adcontextprotocol/adcp-client is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add adcontextprotocol/adcp-client/build-seller-agent@git:20260430.3f82d6fPins git:20260430.3f82d6f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- adcontextprotocol/adcp-client
- Path
.claude/skills/build-seller-agent/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260430.3f82d6f, committed Apr 30, 2026
- First version recorded
- Apr 14, 2026
- Size
- 37,615 bytes
- Repository stars
- 18
- License
- Apache-2.0
Use when building an AdCP seller agent — a publisher, SSP, or retail media network that sells advertising inventory to buyer agents.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Build a Seller Agent ## Overview A seller agent receives briefs from buyers, returns products with pricing, accepts media buys, manages creatives, and reports delivery. The business model — what you sell, how you price it, and whether humans approve deals — shapes every implementation decision. Determine that first. ## When to Use - User wants to build an agent that sells ad inventory - User mentions publisher, SSP, retail media, or media network in the context of AdCP - User references `get_products`, `create_media_buy`, or the media buy protocol **Not this skill:** - Buying ad inventory → that's a buyer/DSP agent (see `docs/getting-started.md`) - Serving audience segments → `skills/build-signals-agent/` - Rendering creatives from briefs → that's a creative agent ## Before Writing Code Determine these five things. Ask the user — don't guess. ### 1. What Kind of Seller? - **Premium publisher** — guaranteed inventory, fixed pricing, IO approval (ESPN, NYT) - **SSP / Exchange** — non-guaranteed, auction-based, instant activation - **Retail media network** — both guaranteed and non-guaranteed, proposals, catalog-driven creative, conversion tracking …
Read the whole file at its exact version.
How to install
mdr add adcontextprotocol/adcp-client/build-seller-agent@sha256:68b74f76b4531fa8The line at the top of this page pins the label git:20260430.3f82d6f, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ym25mo3e7tbl5p5d)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Apr 14, 2026 and Apr 30, 2026, about one every 4 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260430.3f82d6f latest | 2026-04-30 | 3f82d6f | 37,615 B | A | view · diff |
| git:20260428.88e3b02 | 2026-04-28 | 88e3b02 | 35,722 B | A | view · diff |
| git:20260423.42debb0 | 2026-04-23 | 42debb0 | 35,764 B | A | view · diff |
| git:20260419.1037b9d | 2026-04-19 | 1037b9d | 35,757 B | A | view · diff |
| git:20260414.1c69325 | 2026-04-14 | 1c69325 | 16,281 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (37615 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
adcontextprotocol/adcp-client · 18 stars · license Apache-2.0 · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ym25mo3e7tbl5p5d GET https://markdownregistry.com/api/v1/resolve?ref=adcontextprotocol/adcp-client/build-seller-agent GET https://markdownregistry.com/api/v1/blob/68b74f76b4531fa82267ca67109f6fa61647495208fca387b5027cb886cd913f
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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