config-schema-sync

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 struct	Schema path
   Config	top-level properties
   DefaultSessionConfig	properties.default_session.properties
   SessionConfig	properties.session.items.properties
   WindowConfig	properties.window.items.properties
   WildcardConfig	properties.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.