Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add GalaxyRuler/Galactic-skills --skill test-backendgit clone --depth 1 https://github.com/GalaxyRuler/Galactic-skillsWrote 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.
[](https://agentmods.dev/skills/galaxyruler/galactic-skills/test-backend)<a href="https://agentmods.dev/skills/galaxyruler/galactic-skills/test-backend"><img src="https://agentmods.dev/badge/skills/galaxyruler/galactic-skills/test-backend/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.
<a href="https://agentmods.dev/skills/galaxyruler/galactic-skills/test-backend"><img src="https://agentmods.dev/badge/skills/galaxyruler/galactic-skills/test-backend.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00140 | $0.01052 |
| Opus 5.5 | $0.00056 | $0.00421 |
| Sonnet 5.5 | $0.00028 | $0.00210 |
| Haiku 4.5 | $0.00014 | $0.00105 |
Grade A, and why
test-backend 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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 40 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/test-backend — portable back-end testing runner
Execute the Back-end Testing Playbook (playbook.md, same folder) against the current service and emit a findings report. Read it first. Works for any backend; a project-level test-backend overrides this when present.
Scope: an argument narrows to an endpoint/service (/test-backend /api/orders). No argument = the endpoint map from Phase 0.
Phase 0 — Detect the stack (do this first)
Read manifests + config and pick commands. Detect:
- Language/framework: Node (Express/Fastify/Nest), Python (FastAPI/Django/Flask), Go, Java/Kotlin (Spring), Ruby (Rails), .NET, etc.
- Test runner: vitest/jest · pytest · go test · JUnit · rspec · xunit.
- DB/ORM + cache/queue: Prisma/TypeORM/Sequelize · SQLAlchemy/Django ORM · GORM · Hibernate; Redis/Postgres/Kafka.
- Spec: OpenAPI/Swagger · GraphQL SDL · protobuf — the contract source of truth.
- Containers/load/DAST: docker-compose / Testcontainers present? k6/JMeter/Gatling/Locust? OWASP ZAP?
Map to: lint, unit, integration, "start test deps", seed, load. If a tool is absent, degrade that phase to a manual checklist + one-line setup note — never fail the run, never silently pass it.
Read a project
TESTING.md/docs/testing/*/ the Project appendix inplaybook.mdand prefer its commands + auth model.
Runbook (phase-gated — see playbook.md for the why)
- Scope & map — endpoints × method × auth-context; deps; invariants; SLOs + critical journeys.
- Static base — type-check/lint; schema = contract source of truth.
- Unit — pure logic; independent golden master for critical math.
- Integration (widest) — real DB/cache via Testcontainers/compose; in-process route injection; happy/validation/not-found/auth boundary; DB effects, seed determinism, cache + fallback.
- Contract — request+response schema for every endpoint + every declared status code; spec-driven provider tests (Schemathesis/Dredd); consumer-driven (Pact) across services; breaking-change diff vs the committed spec.
- Data & invariants — golden-master parity; deterministic IDs; ETL/sync idempotency + partial-failure isolation; migration safety.
- Resilience & chaos — kill/slow/garble each dep; assert graceful degradation, error-shape, timeouts, retry/backoff, rate-limit; combine Load+Chaos where possible.
- Security — OWASP API Top 10 2023 — BOLA two-account test (A can't touch B's objects) + BOPLA/BFLA; injection (parameterized + schema, fuzz); SSRF on user-influenced fetches; resource caps + rate-limit (+
trustProxy); headers/CORS/no-leak; upstream-data sanitization. Optional ZAP DAST (passive first, non-prod, seed with the spec). - Performance & SLO — encode SLOs as load-tool thresholds (p95/p99, error rate); ramp-up→steady→ramp-down on critical journeys; cache + pool behavior under load. If no load tool → emit scenario + threshold table.
- Report —
docs/testing/reports/<date>-backend.md(or./backend-test-report-<date>.md); map security findings to OWASP API IDs; perf vs SLO; contract diffs explicit.
What ships with it
3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 2mo ago Changed f423b3968fd7
- 2mo ago First seen · 40 lines · 140 tokens per session scan A f5776131bfb1
test-backend is a skill published in the GitHub repository GalaxyRuler/Galactic-skills (5 stars, last pushed 2mo ago), licensed MIT. It adds 140 tokens to every session and 1,052 once invoked, about $0.0006 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 2026-08-31.
test-backend compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| test-backendGalaxyRuler/Galactic-skills | Skill | 5 | 2mo ago | MIT | A | 140 | Codex |
| mem0-oss-to-platformmem0ai/mem0 | Skill | 69k | yesterday | Apache-2.0 | A | 217 | Claude Code, Codex |
| azure-mgmt-botservice-dotnetmicrosoft/skills | Skill | 3.2k | yesterday | MIT | A | 78 | Claude Code |
| fastapi-router-pymicrosoft/skills | Skill | 3.2k | yesterday | MIT | A | 46 | Claude Code |
| dev-runtimelangwatch/langwatch | Skill | 5.0k | today | Apache-2.0 | A | 172 | Claude Code |
| api-designericrisco/rsc-harness | Skill | 529 | 3d ago | MIT | A | 105 | Claude Code, Codex |
| migrate-segw-to-raparc-mcp/arc-1 | Skill | 253 | yesterday | MIT | A | 106 | Claude Code |