Specsync

/specsync

Keep s2/types.go in sync with the OpenAPI spec in the s2-specs submodule.

The types are hand-written on purpose: curated field order, reshaped unions, branded scalars, and SDK-specific ergonomics that no generator should flatten. The doc comments are copied from the spec by hand, so they go stale when the spec changes. This skill updates those doc comments and reports structural drift. It does not regenerate the file.

Sources of truth

• Spec: s2-specs/s2/v1/openapi.json
  • components.schemas.<Name>: the data types (fields, enums, descriptions).
  • paths.<path>.<method>.parameters[]: query parameters for list and metrics operations.
• Code: s2/types.go

What to edit vs. what to flag

Edit the file for doc-comment text that has drifted from the spec, where the spec wording is the intended source. That is the main job.

Flag for the human (do not edit), then ask, for structural drift: a spec field with no Go field, a Go field whose JSON tag is no longer in the spec, an enum value added or removed, or a Go type that changed. The Go type, pointer-ness, and field order are judgment calls. Report them, do not guess.

How things map

• Schema to Go type: same name, except the branded scalar renames: AccessTokenIdStr to AccessTokenID, BasinNameStr to BasinName, StreamNameStr to StreamName.
• Property to Go field: match by the json:"..." tag (strip ,omitempty), not the field name. id becomes ID, seq_num becomes SeqNum, and so on.
• Query param to Go field: list and metrics operations map to …Args structs. Match each in: query parameter to the field by its JSON tag:
  • list_streams to ListStreamsArgs
  • list_basins to ListBasinsArgs
  • list_access_tokens to ListAccessTokensArgs
• Doc comparison: ignore line-wrapping. Go reflows comments across multiple // lines. Compare the collapsed text, and only treat a real wording change as drift.

Intentional divergences: keep these, do not change them

These are deliberate. If the only difference is one of the following, leave the Go doc as is:

• time.Time fields drop "in RFC 3339 format". The spec says e.g. "Creation time in RFC 3339 format.". The SDK uses time.Time, so the Go doc is just "Creation time.".
• *bool config fields. BasinConfig.CreateStreamOnAppend and CreateStreamOnRead are *bool though the spec marks them plain boolean. The pointer distinguishes unset from false.
• Extra SDK guidance. StartAfter docs carry "It must be greater than or equal to the prefix if specified.", which the spec omits.
• Reshaped or hand-owned types, skip entirely: Metric (spec oneOf, modeled as a flat struct), Header (spec [2]string, modeled as a struct), SequencedRecord, AppendRecord, AppendInput (binary []byte bodies), GaugeMetric and AccumulationMetric tuple values, the four *Reconfiguration types (Clear* fields plus custom MarshalJSON), and all …Args, …Options, and …Response types that have no schema. Their docs are SDK-authored, not spec-derived.

If you are unsure whether a divergence is intentional, ask before changing it.

Steps

1. Update the spec if asked. Bump the submodule and confirm what changed:

   git -C s2-specs fetch origin --quiet && git -C s2-specs checkout main --quiet && git -C s2-specs pull --quiet
   git diff --submodule=log s2-specs
   

   Proto is only regenerated when s2-specs/s2/v1/s2.proto changes (task gen). An openapi.json-only change leaves generated/ untouched.

2. Diff docs. For each non-excluded schema, read the description for every property (prefer the property description, then a oneOf branch description). Do the same for the mapped query parameters. Compare against the matching Go field's doc comment, ignoring wrapping.

3. Inject the spec wording for every genuine doc drift that is not one of the intentional divergences above. Edit the // comment lines in s2/types.go. Keep the existing field order, types, and tags. Re-wrap long comments to match the surrounding style.

4. Flag structural drift (missing or extra fields, type or enum changes) in your summary and ask how to handle it. Do not edit struct fields yourself.

5. Verify:

   gofmt -l s2/types.go    # must print nothing
   go build ./... && go test ./s2/ -count=1
   

6. Report: list the docs you changed, the intentional divergences you left, and any structural drift that needs a decision.