skills/workflow/SKILL.md: two example model IDs are not served by the AI Gateway (anthropic/claude-sonnet-4-5, openai/gpt-4)

Where

skills/workflow/SKILL.md (version 1.10) on main:

• Line 154, the DurableAgent example: model: "anthropic/claude-sonnet-4-5"
• Line 94, the Prefer Step Functions example: model: openai("gpt-4")

The problem

Neither ID is served by the AI Gateway.

anthropic/claude-sonnet-4-5 is malformed rather than merely dated. The Gateway spells the minor version with a dot, so the model that exists is anthropic/claude-sonnet-4.5. The hyphenated form has no entry at all, so copying the DurableAgent example verbatim produces a call that fails on an unknown model rather than one that runs on something old.

openai/gpt-4 has been retired. The gpt-4 family on the Gateway is now gpt-4-turbo, gpt-4.1, gpt-4o and their variants.

Verified against the live list (348 models):

$ curl -s https://ai-gateway.vercel.sh/v1/models | jq -r '.data[].id'

anthropic/claude-sonnet-4-5    served: false
anthropic/claude-sonnet-4.5    served: true
anthropic/claude-sonnet-5      served: true
openai/gpt-4                   served: false
openai/gpt-5                   served: true

Why it is worth fixing

This ships as an agent skill, so the examples are copied into generated code close to verbatim, and a malformed model ID fails at the first call rather than degrading quietly. It is also the kind of value a reader is least likely to question, since it looks like a plausible current model.

Worth noting that the sibling use-ai-sdk skill in vercel/ai handles this well: it tells the reader never to use model IDs from memory and gives the curl to fetch the live list. This skill has no equivalent guard, so its hard-coded IDs carry more weight than they should.

Suggested fix

Either pin the examples to IDs that currently resolve (anthropic/claude-sonnet-4.5 or anthropic/claude-sonnet-5, and one of the current gpt-4.x/gpt-5 entries), or make them obviously placeholders and add the one-line pointer to https://ai-gateway.vercel.sh/v1/models that the AI SDK skill already carries. The second ages better, since any pinned ID drifts again on the next release.

Happy to open a PR if that is easier.

Open skills/workflow/SKILL.md and inspect the examples at lines 94 and 154. Check the AI Gateway model list at https://ai-gateway.vercel.sh/v1/models, then update the examples to use served IDs or clearly mark them as placeholders and include the live-list guidance.