Probes the 2023 R2 gRPC browse path and records the finding. The front door does
NOT hit the 2020 WCF metadata-server-pipe wall.
- RetrievalService.StartTagQuery is cracked: the server (CMdServer::StartActiveTagnamesQuery
over \.\pipe\aahMetadataServer\console) parses the filter as OData. startswith()/
contains()/eq/empty succeed and return the 8-byte (queryHandle, tagCount); SQL-LIKE "%"
and glob "*" fail with "ODataFilter: bad token". Live: 220 Sys* tags counted.
- QueryTag (paging) remains: every guessed btRequest returns a constant native error
type 4 / code 72 (content-independent) -> framing needs a native capture, not guessing.
Adds RE probe helpers Grpc/HistorianGrpcTagClient.ProbeStartTagQuery + ProbeTagQuerySequence,
a gated StartTagQuery_OverGrpc_AcceptsODataFilter test, and the finding doc
docs/reverse-engineering/grpc-tag-query-odata.md. Browse is not yet wired (QueryTag open).
217 unit tests pass; 5/5 live gRPC tests pass. No tag names/identities committed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B6mcaT2PjRFKcogzp9UkfC
Joseph Doherty
26ef5e5645