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config-schema-sync

Testing & Quality
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Use when reviewing, writing, or committing changes that touch model/config.go or any TOML config struct in this repo. Verifies that every added, renamed, or removed TOML field has a matching update in sesh.schema.json so the JSON schema used by TOML editors (via `#:schema` directive) stays in sync with the Go config model. Trigger whenever a diff touches files under model/, configurator/, or any struct tagged with `toml:"..."`.

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How to use this skill

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Source SKILL.md: https://github.com/joshmedeski/sesh/blob/HEAD/.claude/skills/config-schema-sync/SKILL.md

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Config ↔ Schema Sync Check

The sesh.schema.json file at the repo root is the public JSON Schema that TOML editors load via #:schema https://github.com/joshmedeski/sesh/raw/main/sesh.schema.json. Any config field that exists in Go but is missing from the schema produces "Additional properties are not allowed" errors for users (see issue #367 for precedent).

When to run this check

Run whenever a change touches any of:

  • model/config.go
  • Any Go struct with toml:"..." tags
  • Files under configurator/

Procedure

  1. List the TOML fields added/renamed/removed in the diff:

    git diff --unified=0 -- model/config.go configurator/ | rg 'toml:"[^"]+"'

  2. For every changed field, verify sesh.schema.json matches. Map the Go struct to its schema location:

    Go structSchema path
    Configtop-level properties
    DefaultSessionConfigproperties.default_session.properties
    SessionConfigproperties.session.items.properties
    WindowConfigproperties.window.items.properties
    WildcardConfigproperties.wildcard.items.properties

    Check each changed field:

    rg '"<field_name>"' sesh.schema.json

  3. Report discrepancies. For each field present in Go but missing (or stale) in the schema, either:

    • Add it to the schema with an appropriate type, description, and default where applicable, or
    • Flag it in the review output so the author can decide.

  4. Preserve schema conventions when editing:

    • additionalProperties: false on nested objects — keep it.
    • description is required and should mirror the field's purpose (not just restate the name).
    • Include default when the Go zero-value is meaningful.
    • Use type: "string" | "boolean" | "integer" | "array" matching the Go type.

Quick diff-check one-liner

# Extract TOML field names from Go, compare against schema
comm -23 \
  <(rg -o 'toml:"([^,"]+)' -r '$1' model/config.go | sort -u) \
  <(rg -o '"([a-z_]+)":\s*\{' -r '$1' sesh.schema.json | sort -u)

Any field printed is in Go but not in the schema — investigate.

Do not

  • Do not bump the schema $id URL.
  • Do not remove additionalProperties: false to "fix" a missing field — add the field instead.
  • Do not add fields to the schema that are not yet merged in Go; the schema should track main.