api-test-mode-design SKILL.md skillA
api-test-mode-design from samber/developer-platform-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add samber/developer-platform-skills/api-test-mode-design@v1.0.2Pins v1.0.2 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- samber/developer-platform-skills
- Path
skills/api-test-mode-design/SKILL.md- Versions recorded
- 5
- Latest version
- v1.0.2, committed Oct 25, 2026
- First version recorded
- Aug 28, 2026
- Size
- 22,435 bytes
- Repository stars
- 9
- License
- MIT
Design the test/sandbox mode of a public API platform so external integrators build and validate without touching real money, messages, or data - isolation architecture (soft test-mode toggle vs hard separate-copy sandbox), test-key prefixing, magic test values, simulated objects and personas, on-demand test events, deterministic time manipulation, reset and seeding, sandbox quotas, abuse controls, and graduation to live. Use whenever the user mentions a sandbox, test mode, test API keys…
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
# API Test Mode Design You are a test-mode designer for an API platform. Design the sandbox environment external integrators build against - its isolation boundary, credentials, deterministic test values, simulated events and time, quotas, abuse controls, and the path to live - so an integration is fully validated before it ever touches real money, messages, or data. A sandbox is table stakes for developer trust on any platform that expects third-party integrators. It is a _stateful_ environment that validates business logic across a sequence of calls, not a mock server's static request→response mapping. The gap shows up around week three of an integration: bugs a stateless mock cannot reproduce because it has no concept of what happened on a prior call. ## Scope Designs sandbox/test-mode environments (test keys, deterministic fixtures, simulated events) so integrators build without real data. This is product test-mode design, distinct from the existing `developer-sandbox` marketing-playground skill on skills.sh: that skill builds a marketing try-it playground. This one designs the product's own test mode. Boundaries with siblings: …
Read the whole file at its exact version.
How to install
mdr add samber/developer-platform-skills/api-test-mode-design@sha256:68e2e3cdb4a558b5The line at the top of this page pins the label v1.0.2, 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_ocgrj6eq5orvid6v)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Aug 28, 2026 and Oct 25, 2026, about one every 15 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.2 latest | 2026-10-25 | 4e87402 | 22,435 B | A | view · diff |
| v1.0.1 | 2026-10-21 | 436e510 | 22,373 B | A | view · diff |
| v1.0.1 | 2026-09-27 | 3f8efdb | 22,180 B | A | view · diff |
| v1.0.0 | 2026-08-28 | a8a4c1b | 21,777 B | A | view · diff |
| v1.0.0 | 2026-08-28 | 834e9da | 21,776 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 (22435 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
samber/developer-platform-skills · 9 stars · license MIT · pushed 2026-11-01 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ocgrj6eq5orvid6v GET https://markdownregistry.com/api/v1/resolve?ref=samber/developer-platform-skills/api-test-mode-design GET https://markdownregistry.com/api/v1/blob/68e2e3cdb4a558b56765e6dc079347c4ad16d904d6ab52ad618105ece1380005
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.