Recommended actions

• [Documentation problem | Medium] Clarify output scope for schema-only prompts — Add an explicit instruction to the AI guidelines that when a task asks for tables, structs, or views only, the generated module must not invent reducers, init hooks, or other client-callable logic. Evidence: t_001_basic_tables, t_003_struct_in_table, t_023_view_per_user.

Failure patterns

Unrequested reducers added to schema-only outputs (3 tasks)

• Classification: Documentation problem
• Confidence: Medium
• What the model wrote:
  • t_001_basic_tables: #[spacetimedb::reducer(init)] pub fn init(_ctx: &ReducerContext) {}
  • t_003_struct_in_table: #[spacetimedb::reducer] pub fn create_entity(...) { ... }
  • t_023_view_per_user: #[spacetimedb::reducer] pub fn set_profile(...) { ... }
• What was expected:
  • t_001_basic_tables: only the three #[table(...)] structs
  • t_003_struct_in_table: only Position and #[table(accessor = entity)] pub struct Entity
  • t_023_view_per_user: only the Profile table and #[view(accessor = my_profile, public)]
• What the error says:
  • t_001_basic_tables: schema_parity: reducers differ - expected [], got ["init()..."]
  • t_003_struct_in_table: schema_parity: reducers differ - expected [], got ["create_entity(...)..."]
  • t_023_view_per_user: schema_parity: reducers differ - expected [], got ["set_profile(...)..."]
• Why this happened: The model appears to have generalized from module examples and added application logic even when the target schema did not require any reducers. The repeated pattern suggests the prompt guidance did not sufficiently constrain output to the requested artifact type.
• Suggested action: Update the AI guidelines to state that reducers, lifecycle hooks, and other logic must only be emitted when explicitly requested by the task.
• Suggested area: AI guidelines / Rust module generation cheat-sheet
• Affected tasks: t_001_basic_tables, t_003_struct_in_table, t_023_view_per_user
• AI guidelines gap: No explicit “do not add reducers unless requested” rule for schema-only or view-only generation tasks.