A command for mapping the tests that each domain entity should have. It links each required behavior to an existing test or to a placeholder for a missing test.

Creating canonical test suites for entities and preparing a complete test plan before fixing missing coverage.

It shows test coverage gaps clearly and prevents one requirement from being overlooked or tested in multiple places.

How prebid/salesagent configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to prebid/salesagent. 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/prebid/salesagent/main/.claude/skills/surface/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/prebid/salesagent

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/prebid/salesagent/surface/github.svg)](https://agentmods.dev/skills/prebid/salesagent/surface)

Your own site

<a href="https://agentmods.dev/skills/prebid/salesagent/surface"><img src="https://agentmods.dev/badge/skills/prebid/salesagent/surface/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/prebid/salesagent/surface"><img src="https://agentmods.dev/badge/skills/prebid/salesagent/surface.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 794 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. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

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.

Model	Per session	Once invoked
Fable 5.1	$0.00056	$0.00794
Opus 5.5	$0.00022	$0.00318
Sonnet 5.5	$0.00011	$0.00159
Haiku 4.5	$0.00006	$0.00079

Measured 1mo ago against content hash b6f6c80831da, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

surface 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.

.claude/skills/surface/SKILL.md · 96 lines

How it starts

The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Entity Test Surface Mapping

Create canonical test suites per domain entity by mapping all test obligations to real tests or stubs. This gives complete visibility into what's tested and what's missing.

Args

/surface <entity-name-1> [entity-name-2] ...

Entity names (space-separated). Each gets a test file at tests/unit/test_{entity_name}.py (hyphens → underscores).

Entity → Obligations Mapping

Entity	Primary Obligations	Output File
product	UC-001	test_product.py
media-buy	UC-002, UC-003	test_media_buy.py
delivery	UC-004	test_delivery.py
creative-formats	UC-005	test_creative_formats.py
creative	BR-UC-006	test_creative.py
properties	BR-UC-007	test_properties.py
audience-signals	BR-UC-008	test_audience_signals.py
performance	BR-UC-009	test_performance.py
capabilities	BR-UC-010	test_capabilities.py
pricing-option	business-rules, constraints	test_pricing_option.py
transport-boundary	#1050/#1066 principles	test_transport_boundary.py

All entities also check cross-cutting files: business-rules.md, constraints.md.

What You Get

For each entity, a test module containing:

Real tests: Ported from existing (possibly scattered) test files
Skip stubs: @pytest.mark.skip(reason="STUB: [obligation-ID]") for every gap
Obligation traceability: Each test/stub references its obligation ID

Open test_creative.py → see 89 test names → 30 real, 59 stubs → know exactly what's missing.

Protocol

Step 1: Cook the molecule

python3 .claude/scripts/cook_formula.py \
  --formula .claude/formulas/entity-test-surface.yaml \
  --var "ENTITY_NAMES={all_args}" \
  --epic-title "Surface: {all_args}"

Dry run first (recommended):

python3 .claude/scripts/cook_formula.py \
  --formula .claude/formulas/entity-test-surface.yaml \
  --var "ENTITY_NAMES={all_args}" \
  --epic-title "Surface: {all_args}" \
  --dry-run

Read the full file on GitHub · 96 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.

1mo ago First seen · 96 lines · 56 tokens per session scan A b6f6c80831da

Subscribe to this mod's changes

surface is a skill published in the GitHub repository prebid/salesagent (39 stars, last pushed yesterday), licensed Apache-2.0. It adds 56 tokens to every session and 794 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 2026-09-01.

Testing Unit testing

test-master

Generates test files, creates mocking strategies, analyzes code coverage, designs test architectures, and produces test plans and defect reports across functional, performance, and security testing disciplines. Use when writing unit tests, integration tests, or E2E tests; creating test strategies or automation…

Jeffallan/claude-skills · 104 tokens

migrate-xunit-to-xunit-v3

Migrate .NET test projects from xUnit.net v2 to xunit.v3 and fix v3 breaks. Use for package/CPM conversion, OutputType=Exe, preserving the VSTest or MTP runner (including projects currently using YTest.MTP.XUnit2), incompatible TFMs, async void tests, string-to-Type attributes, custom Fact/Theory/BeforeAfterTest…

dotnet/skills · 149 tokens

salesagent: Skill for Claude Code