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 agentmods add skills/rand/cc-polymath/discover-apinpx skills add rand/cc-polymath --skill discover-apigit clone --depth 1 https://github.com/rand/cc-polymathWhat 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 | $0.00047 | $0.01398 |
| Opus 5 | $0.00023 | $0.00699 |
| Sonnet 5 | $0.00009 | $0.00280 |
| Haiku 4.5 | $0.00005 | $0.00140 |
Grade A, and why
discover-api 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 2d 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 — 208 lines — stays where its author put it; the contents beside it link to each section on GitHub.
API Skills Discovery
Provides automatic access to comprehensive API design, authentication, and implementation skills.
When This Skill Activates
This skill auto-activates when you're working with:
- REST API design and implementation
- GraphQL schema design
- API authentication (JWT, OAuth 2.0, API keys, sessions)
- API authorization (RBAC, ABAC, permissions)
- Rate limiting and throttling
- API versioning strategies
- Error handling and validation
- HTTP methods, status codes, endpoints
Available Skills
Quick Reference
The API category contains 8 specialized skills:
- rest-api-design - RESTful resource modeling, HTTP semantics, URL conventions
- graphql-schema-design - GraphQL types, resolvers, N+1 problem prevention
- api-authentication - JWT, OAuth 2.0, API keys, session management
- api-authorization - RBAC, ABAC, policy engines, permission systems
- api-rate-limiting - Token bucket, sliding window, rate limiting algorithms
- api-versioning - API versioning, deprecation, backward compatibility
- api-error-handling - RFC 7807 errors, validation, standardized responses
- api-design-rules - 35 opinionated rules for API design
Load Full Category Details
For complete descriptions and workflows:
Read ../api/INDEX.md
This loads the full API category index with:
- Detailed skill descriptions
- Usage triggers for each skill
- Common workflow combinations
- Cross-references to related skills
Load Specific Skills
Load individual skills as needed:
Core API design
Read ../api/rest-api-design.md Read ../api/graphql-schema-design.md
Security and access control
Read ../api/api-authentication.md Read ../api/api-authorization.md
Production hardening
Read ../api/api-rate-limiting.md Read ../api/api-error-handling.md Read ../api/api-versioning.md
Rules and best practices
Read ../api/api-design-rules.md
Common Workflows
New REST API
Sequence: REST design → Authentication → Authorization
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.
- 2d ago First seen · 208 lines · 47 tokens per session scan A 3018948c82fc
discover-api is a skill published in the GitHub repository rand/cc-polymath (136 stars, last pushed 6mo ago), licensed MIT. It adds 47 tokens to every session and 1,398 once invoked, about $0.0002 per session on Opus 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 2026-08-30.
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