Builder API

CustodianBuilder is the Custodian class as a fluent chain. Same result, different style.

from custodian_labs import CustodianBuilder

app = (
    CustodianBuilder()
    .with_model("gpt-4o")
    .with_prompt("You are a helpful finance assistant.")
    .with_examples([
        {"user": "When is an invoice overdue?",
         "assistant": "After the due date passes without payment."},
    ])
    .with_data_source_file("./policies.pdf")
    .deploy()
)

print(app.chat("Give me a short overdue-invoice policy.").response)

Method
`.with_model(model)`	Required.
`.with_prompt(prompt)` / `.with_system_prompt(prompt)`	Required.
`.with_name(name)` / `.with_description(description)`	Metadata.
`.with_examples(examples)`	Few-shot pairs.
`.with_data_source_file(path)`	Attach a file; call repeatedly for more.
`.with_response_schema(schema)`	JSON Schema for structured output.
`.with_privacy(enabled=True)`	Inline PII masking.
`.deploy(share_mode=, share_password=)`	Create + deploy → `App`.
`.chat()`	Deploy, then interactive terminal chat.

For tools or input_schema, use the Custodian class.

Credentials come from the environment only (CUSTODIAN_SDK_API_KEY / CUSTODIAN_SDK_BASE_URL). Need explicit api_key? Use the Custodian class. AssistantBuilder is a deprecated alias.

Data Sources & RAG · Chat Sessions

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