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Update claude-api skill: Claude Fable 5 and Claude Mythos 5 (#1294)

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- Add Claude Fable 5 and Claude Mythos 5 to the model tables with pricing,
  context window, and model-selection guidance
- Document Fable-specific API behavior: always-on adaptive thinking (explicit
  disabled returns 400), protected-thinking display and replay rules, new
  tokenizer (~30% more tokens), refusal stop reason with server-side fallbacks
  and SDK fallback middleware, 30-day data-retention requirement
- Add the full Migrating to Claude Fable 5 guide section and checklist,
  including the Mythos Preview migration path
- Refresh skill trigger description, effort/compaction/task-budget notes,
  caching minimums, structured-output and dynamic-filtering support tables
This commit is contained in:
Lance Martin
2026-06-09 10:34:55 -07:00
committed by GitHub
parent c30d329f58
commit 5d25128289
13 changed files with 306 additions and 40 deletions
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skills/claude-api/shared/live-sources.md
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@@ -17,6 +17,7 @@ This file contains WebFetch URLs for fetching current information from platform.
| --------------- | ---------------------------------------------------------------------------- | ------------------------------------------------------------------------------- |
| Models Overview | `https://platform.claude.com/docs/en/about-claude/models/overview.md` | "Extract current model IDs, context windows, and pricing for all Claude models" |
| Migration Guide | `https://platform.claude.com/docs/en/about-claude/models/migration-guide.md` | "Extract breaking changes, deprecated parameters, and per-model migration steps when moving to a newer Claude model" |
| Introducing Claude Fable 5 | `https://platform.claude.com/docs/en/about-claude/models/introducing-claude-fable-5.md` | "Extract capabilities, API changes, and availability stages for Claude Fable 5 and Claude Mythos 5" |
| Pricing | `https://platform.claude.com/docs/en/pricing.md` | "Extract current pricing per million tokens for input and output" |
### Core Features
@@ -129,6 +130,8 @@ WebFetch these when a binding (class, method, namespace, field) isn't covered in
| C# | `https://github.com/anthropics/anthropic-sdk-csharp` | "Extract beta managed-agents classes and method signatures (NuGet package, `BetaManagedAgents*` types)" |
| PHP | `https://github.com/anthropics/anthropic-sdk-php` | "Extract beta managed-agents classes and method signatures (`$client->beta->agents`, `BetaManagedAgents*` params)" |
Each SDK repo also ships runnable programs under `examples/` — including the refusal-fallback / `fallbacks` examples (client-side middleware registration, fallback state, server-side `fallbacks` param). Fetch those for exact per-language syntax instead of translating another language's example.
---
## Fallback Strategy