Core Constraints

Must-follow rules

1. Never ask user to run setup commands manually; agent performs setup.
2. Run CLI preflight (taubyte-cli-prereqs) before all Taubyte operations.
3. For Dream/local, never run backend-contacting tau commands before Dream is up and universe exists.
4. Use dream commands directly; never use tau dream.
5. Use default universe default unless user explicitly requests another.
6. After resource creation, push config (tau push project --config-only) before relying on resource visibility.
7. After code changes, push code (tau push project --code-only) and verify builds/logs.
8. Never set function timeout to 0; use valid durations (30s, 1m, etc.).
9. HTTP functions: one function per path+method; never comma-separated methods.
10. For functions/websites in automation, use empty template; for Go functions, include --language Go.
11. Use matcher values for DB/storage SDK calls, not human-facing resource names or YAML filenames (description / basename are not runtime keys). The Go string must match YAML match (and regex pattern when useRegex: true). Examples: match: appdata ↔ database.New("appdata"); match: /todos ↔ database.New("/todos") — leading slash must match exactly.
12. Do not bypass failing tau push project with direct git operations.
13. On Git Bash Windows for path-like flags, prefix with MSYS_NO_PATHCONV=1.
14. Website .taubyte/build.sh must be non-empty and must write deploy output to /out.
15. Verify project selection with tau --json current before resource mutations.
16. Website/library git fallback is an exception path only when tau push website|library is unavailable; never apply this exception to project config/code pushes.
17. Never create website/library without explicit repository strategy:
    • use --generate-repository with deterministic --repository-name, or
    • use explicit existing --repository-name/--repository-id.
18. After creating website/library, verify repository binding in config (websites/*.yaml or libraries/*.yaml) before pushing.
19. Go functions: empty.go stays at the function root next to go.mod. Never manually create lib/, never move empty.go under lib/, and never hand-author main.go in the function folder to fix builds. For local WASM verification, use the taubyte/go-wasi Docker recipe in taubyte-go-sdk-constraints — not lib/ + main.go shims.
20. New project: If the user asked to create a new project, run tau new project + tau select project, then tau --json current and confirm Project matches the new name before any tau import, tau push project, or tau new resource command. Stale selection is the usual cause of “imports pulling the wrong GitHub project.”
21. Project config notification email: ensure config/config.yaml has a valid notification.email (not ""). Prefer git config user.email; if unavailable, ask the user for the email. Write it as a plain YAML value (no quotes) to avoid mail: no address config-compiler failures.
22. Push ordering: always push project config first and wait for the latest Config build to succeed before pushing website/library code that depends on those resources being present in config.
23. HTTP handlers with a body: set headers (e.g. Content-Type) as needed, write the body (Write / equivalent), then Return with the final status as the last step. Returning before writing yields empty or broken JSON and clients that look like “API does nothing.”
24. After adding or renaming databases or messaging, grep the codebase for database.New( and pubsubnode.Channel( (or equivalent) and diff literals against config/applications/<app>/databases/*.yaml and messaging/*.yaml before declaring the task done.

Database and messaging (config ↔ code)

• Database: path is config/applications/<app>/databases/<name>.yaml. Every database.New(...) in WASM for that app must use the same string as resource match when useRegex: false. Typical YAML also includes useRegex, access.network, storage.size, replicas.min / replicas.max — follow CLI-generated shapes when unsure.
• Messaging + PubSub: the messaging resource defines channel.match (and bridges.mqtt / bridges.websocket). PubSub-triggered functions use trigger.type: pubsub and trigger.channel equal to that match. Producers in HTTP code use the same channel string with pubsub/node. When both messaging and function YAML include local, keep them consistent. Enable websocket in messaging config if handlers expose WebSocket().Url() to browsers.
• Debugging “database open failed”: first compare YAML match vs every database.New literal in that application (including /).

Layout constraints

• Project has tb_config_<name> + tb_code_<name>.
• Website/library have separate repositories.
• Function build layout must be discoverable by build system (avoid misplaced function paths). For Go serverless functions, that means root empty.go only for authored sources; do not invent a lib/ tree or commit ad-hoc main.go beside it.