7 micro-topics in Services & APIs, each with the evidence that proves you have it and the written reason behind every link. Before you start, it rests on 4 other domains. Downstream, it holds up 3 domains.
7 topics · depth 4–8 of 16 · 6 internal links · 5 in · 4 out
Load-bearing links first. Each one says what in this domain rests on what outside it, and why.
2 links
Validate at the boundary rests on Design an API contract
The boundary is where the contract is enforced.
Generate JSON Schema from models rests on Express a contract in OpenAPI
Generated schema is what makes the spec trustworthy.
1 link
Define schemas with Pydantic rests on Define classes
Models are classes.
1 link
Define schemas with Pydantic rests on Add type hints
Fields are declared with type annotations.
1 link
Manage configuration as typed settings rests on Manage environment variables
Configuration comes from environment variables.
In prerequisite order. Each idea names the artifact that closes it, the market demand that put it on the map, and what it stands on.
Depth 4 · conceptual · unassisted · M15 §15.3
Rejects malformed input before it reaches logic
Design an API contract · API Contracts
The boundary is where the contract is enforced.
Depth 6 · representational · unassisted · M15 §15.3
Models request and response shapes
Define classes · Python Core
Models are classes.
Add type hints · Production Python
Fields are declared with type annotations.
Models are the mechanism for the principle.
Depth 7 · procedural · unassisted · M15 §15.3
Enforces rules a type cannot express
Validators attach to fields you have declared.
Depth 7 · procedural · unassisted · M15 §15.3
Shapes output with model_dump and aliases
Serialization emits the models you defined.
Depth 7 · representational · unassisted · M15 §15.3
Loads and validates environment configuration
Settings are models loaded from the environment.
Manage environment variables · Shell Configuration
Configuration comes from environment variables.
Depth 7 · representational · scaffolded · M15 §15.3
Derives documentation and clients from types
Schema is generated from models.
Express a contract in OpenAPI · API Contracts
Generated schema is what makes the spec trustworthy.
Depth 8 · procedural · scaffolded · M15 §15.3
Enforces cross-field consistency
Cross-field rules build on single-field rules.
Everything downstream that names an idea here as a prerequisite, grouped by where it lives.
2 links
Bind request bodies to models rests on Define schemas with Pydantic
Request bodies are validated by models.
Declare response models rests on Control serialization
Responses are serialized models.
1 link
Get structured output rests on Define schemas with Pydantic
The schema is a model.
1 link
Write deterministic checks rests on Generate JSON Schema from models
Structural checks are the same validation applied to output.
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