| name | mz-adapter-guide |
| description | Correctness invariants + architecture: adapter, coordinator, pgwire, peek paths, timestamp oracle. Trigger: questions about these subsystems — "how does coordinator work", "what are read holds", "explain peek path", "how does timestamp selection work", "why does this query block". Also when editing OR reviewing code in src/adapter/, src/pgwire/, src/timestamp-oracle/ (reviewing a PR, diff, or commit that touches these paths counts).
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Adapter Guide Skill
When working on or reviewing the adapter layer or related crates, always read
and follow the guidance in doc/developer/guide-adapter.md. That document
contains correctness invariants, architectural notes, a list of optimizations
that have been tried and rejected for correctness reasons, and a checklist for
reviewing adapter changes. Read it before making changes and before reviewing
them.
Read doc/developer/guide-adapter.md now.
When working on the timestamp oracle (src/timestamp-oracle/), also read the
module-level docs in src/timestamp-oracle/src/lib.rs and
src/timestamp-oracle/src/batching_oracle.rs for the TimestampOracle trait
contract and the batching/linearizability invariants.
When you or the user discover that an approach is incorrect or heading in a
wrong direction, suggest distilling the learning into
doc/developer/guide-adapter.md. Add it to whichever section fits best — a
new correctness invariant, a new subsection under an existing invariant, a
rejected optimization, or a new top-level section if needed. Describe what was
tried, why it's wrong, and any relevant context. This keeps the guide up to
date and prevents future re-discovery of the same pitfalls.
