# Choose a complete operational walkthrough

Each route starts from a saved runnable script with its setup included. Read the
named prerequisite guides first, or open the complete example directly.

| Outcome | Start with | What to inspect |
| --- | --- | --- |
| Build a working application from generated classes | [Codegen](codegen.md), Expert 36 | Word counts, object state, unique reuse, independent workers |
| Compare permitted and rejected code | [Agent rooms](agent-rooms.md), Expert 07 | Acceptance payloads and named validation issues |
| Prepare a candidate without changing the live version | [Governed change](governed-change.md), Expert 22 | Unchanged heads and original pricing behavior |
| Reconcile source across two modules | [Compositions](compositions.md), Expert 30 | Replaced/added parts and returned candidate source |
| Preserve a record across runtime teardown | [Restore](restore.md), Expert 27 | Local cache survival and the actual load report or refusal |
| Round-trip a research record as JSON | [Research](research.md), Expert 28 | Preserved set identity and lane organization |
| Run several rooms concurrently | [Concurrency](concurrency.md), Expert 21 | Exact job results and distinct workstations |

A script pass establishes its executed assertions and handled outcomes. For an
operational deployment, also inspect the application-specific result: a reported
refusal, a local checkpoint, and a completed remote restore are different outcomes.


## Runnable examples

- [An agent builds a working system](../examples/expert/36-an-agent-builds-a-working-system.md) — Expert 36
- [The codegen room agents writing code](../examples/expert/07-the-codegen-room-agents-writing-code.md) — Expert 07
- [Asking what code would do before running it](../examples/expert/22-asking-what-code-would-do-before-running-it.md) — Expert 22
- [Composing a version in the workshop](../examples/expert/30-composing-a-version-in-the-workshop.md) — Expert 30
- [A world that outlives its own runtime](../examples/expert/27-a-world-that-outlives-its-own-runtime.md) — Expert 27
- [The record crosses as a json string](../examples/expert/28-the-record-crosses-as-a-json-string.md) — Expert 28
- [Many agents writing code at once](../examples/expert/21-many-agents-writing-code-at-once.md) — Expert 21

[All expert examples](../examples/expert/index.md) · [Level contents](index.md) · [Full contents](../contents.md)

[Canonical page source](https://github.com/Synaptic724/melder/blob/0895ce795453cd87e35d70665957b4e89aad3317/docs/expert/walkthroughs.md)