Engineering-quality cleanups from the SDK review (no behavior change):
- Return-type discoverability: add pageindex/types.py with TypedDicts
(DocumentInfo, DocumentDetail, PageContent) and annotate Collection /
Backend methods with them; add docstrings to every public Collection
method (including the get_page_content `pages` spec). Exported from the
package. Zero runtime cost — these are plain dicts.
- Backend protocol as a real contract:
* query_stream is an async generator, so the protocol now declares it
as `def ... -> AsyncIterator[QueryEvent]` (not `async def`, which
typed it as a coroutine and never matched the implementations).
* custom-parser support is expressed as a runtime_checkable
SupportsParserRegistration capability protocol; the client uses
isinstance(...) instead of hasattr(...) duck-typing.
- Parser layering: move count_tokens into a leaf module pageindex/tokens.py
so parser/* imports it from there instead of reaching back into
pageindex.index (a reverse dependency). index.utils re-exports it for
backward compatibility.
Adds tests/test_architecture.py enforcing: parser never imports index,
count_tokens is a single shared leaf, the capability protocol works,
both backends satisfy Backend, and the TypedDicts are exported.
Claude-Session: https://claude.ai/code/session_01Kx5DgKbhK1N8autqXH8SmS
- Collection.query and Backend.query/query_stream accept doc_ids as
str, list[str] or None. Single str is normalized to [str] inside each
backend; bare [] is rejected with ValueError at both layers.
- wrap_with_doc_context wraps the scoped doc list in <docs>...</docs>
and SCOPED_SYSTEM_PROMPT instructs the agent to treat that block as
data, not instructions (defense against prompt injection via
auto-generated doc_description).
- _require_cloud_api now distinguishes api_key="" from api_key=None;
the former gives a targeted error pointing at the empty-string vs
fall-back-to-local situation when legacy SDK methods are called.
- Legacy PageIndexClient.list_documents docstring spells out the
return-shape difference vs collection.list_documents() to flag a
silent migration footgun (paginated dict with id/name keys vs plain
list[dict] with doc_id/doc_name keys).
- Remove dead CloudBackend.get_agent_tools stub (not on the Backend
protocol; only ever returned an empty AgentTools()) and the
SYSTEM_PROMPT alias (OPEN_/SCOPED_SYSTEM_PROMPT are the explicit
names now).
- README quick start and streaming example now pass doc_ids; new
multi-document section shows both str and list forms.
- examples/demo_query_modes.py exercises all five query-mode cases
(single-doc, multi-doc with/without env var, scoped single, scoped
multi) for manual verification.
