build-seller-agent SKILL.md skillB
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:20261031.e1b1fd3Pins git:20261031.e1b1fd3 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- B, 16 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- adcontextprotocol/adcp-client
- Path
skills/build-seller-agent/SKILL.md- Versions recorded
- 6
- Latest version
- git:20261031.e1b1fd3, committed Oct 31, 2026
- First version recorded
- May 8, 2026
- Size
- 14,776 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 A seller agent receives briefs from buyers, returns products, accepts media buys, manages creatives, and reports delivery. The fastest path to a passing agent is to **fork a worked adapter** and replace its `// SWAP:` markers with calls to your backend. Each `// SWAP:` comment marks one line you change to your platform's backend call — change only those lines, run the gate, ship. ([`examples/CONTRIBUTING.md`](../../examples/CONTRIBUTING.md) covers the SWAP-marker convention in detail.) Proxy-shaped sellers use the lighter `proxy-seller-snap/` bridge-pattern fork target plus a live-OAuth sandbox runner. This skill tells you which adapter to fork and what cross-cutting rules apply across all of them. ## Pick your fork target Each `hello_*_adapter_*` entry is a worked, currently-running, three-gate-tested reference adapter. `proxy-seller-snap/` is a bridge-pattern fork target for the seed-read problem; pair it with your own live-OAuth sandbox gate before production. …
Read the whole file at its exact version.
How to install
mdr add adcontextprotocol/adcp-client/build-seller-agent@sha256:a3a4cd320ff5e9b7The line at the top of this page pins the label git:20261031.e1b1fd3, 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_rvnuzyyko5o74kmj)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between May 8, 2026 and Oct 31, 2026, about one every 35 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261031.e1b1fd3 latest | 2026-10-31 | e1b1fd3 | 14,776 B | B | view · diff |
| git:20260915.06c685f | 2026-09-15 | 06c685f | 14,407 B | B | view · diff |
| git:20260818.85f8b35 | 2026-08-18 | 85f8b35 | 13,444 B | B | view · diff |
| git:20260527.0938599 | 2026-05-27 | 0938599 | 13,337 B | B | view · diff |
| git:20260516.099e077 | 2026-05-16 | 099e077 | 12,428 B | B | view · diff |
| git:20260508.8117e93 | 2026-05-08 | 8117e93 | 9,790 B | B | view |
Audit of the latest version
- fail: No link to a raw IP address (matched: http://127.0.0.1:3004)
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (14776 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 script tag
Starting a new one? Use a template for SKILL.md on mdpantry, which passes every one of these checks and says what to change in it.
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_rvnuzyyko5o74kmj GET https://markdownregistry.com/api/v1/resolve?ref=adcontextprotocol/adcp-client/build-seller-agent GET https://markdownregistry.com/api/v1/blob/a3a4cd320ff5e9b77e745b88e202dbcef01d64a2bb83e7f3d214285578aa1d34
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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