Crate hotl_types 

L1 — canonical conversation types.

Pure data + serde. No tokio, no I/O. Forward-compat serde is policy: #[serde(other)] Unknown on persisted enums, format_version in the session header, optional fields default + skip-when-none.

Assistant content is kept as verbatim provider blocks (serde_json::Value) rather than re-typed structs: signed thinking blocks must echo back to the provider byte-faithfully or replay breaks (review A11), and unknown future block types survive a round-trip losslessly. Typed views are provided for the engine (assistant_text, assistant_tool_uses).

Structs

Entry

One appended log record. parent_id forms a chain (a tree from M3); M0 logs are strictly linear.

SessionHeader

TokenUsage

Normalized usage; fields absent from a provider response default to zero.

ToolResultItem

ToolUse

A tool invocation extracted from assistant blocks.

Enums

EntryPayload

Item

One conversation item. Internally tagged so #[serde(other)] can absorb item kinds this binary doesn’t know yet (payload dropped, no crash).

StopReason

Why a sample stopped. Other absorbs stop reasons newer than this binary.

SyntheticReason

Structural provenance on every injected user item (grok 04): no consumer ever parses message text to learn where it came from.

Constants

FORMAT_VERSION

Bumped only on breaking changes to the persisted entry format.

Functions

assistant_text

Concatenated text of the assistant’s text blocks.

assistant_tool_uses

Tool-use blocks in source order.

new_ulid