Stacked on PR-1 (#2729). Computes the readable/writable namespace lists
for a workspace from the live workspaces tree at request time. No
precomputed columns, no migrations — re-parenting on canvas takes
effect immediately on the next memory call.
What ships:
- workspace-server/internal/memory/namespace/resolver.go
- walkChain: recursive CTE, walks parent_id chain to root, capped
at depth 50 to defend against malformed/cyclic data
- derive: maps a chain to (workspace, team, org) namespace strings
- ReadableNamespaces / WritableNamespaces: the public API
- CanWrite + IntersectReadable: server-side ACL helpers MCP
handlers (PR-5) will call before talking to the plugin
- resolver_test.go: 100% statement coverage
Design choices worth flagging:
- Today's tree is depth-1 (root + children). The recursive CTE
handles arbitrary depth so we don't have to revisit the resolver
when the tree deepens.
- GLOBAL→org write restriction (memories.go:167-174) is preserved
by gating the org namespace's Writable flag on parent_id IS NULL.
- Removed-status workspaces are NOT filtered from the chain walk —
matches today's TEAM behavior (memories.go:367-372 filters on
read, not on tree walk).
- IntersectReadable with empty `requested` returns ALL readable
namespaces (default-search-everything semantic from the discovery
tools spec).
This package has zero callers in this PR; integration starts in PR-5.
Builds on PR-1 (#2729). Implements every endpoint in the OpenAPI spec
plus two operational concerns the agent never sees:
1. Capability negotiation. Boot/Refresh probes /v1/health and
captures the plugin's capability list. MCP handlers (PR-5) ask
SupportsCapability before exposing capability-gated features —
e.g., agents can only request semantic search when "embedding"
is reported.
2. Circuit breaker. Three consecutive failures open the breaker for
60 seconds; while open, calls fail fast with ErrBreakerOpen.
Picked these constants because:
- 3 failures: long enough to skip transient blips, short enough
to react before all in-flight handlers stack on the timeout
- 60s cooldown: long enough to back off a flapping plugin,
short enough that recovery is felt within a single session
4xx responses do NOT count toward the breaker (those are client
bugs, not plugin health issues); 5xx + transport errors do.
What ships:
- workspace-server/internal/memory/client/client.go
- client_test.go: 100% statement coverage
Coverage corner cases pinned:
- env-var success branches in New (parseDurationEnv applied)
- json.Marshal error (via channel in Propagation)
- http.NewRequestWithContext error (via unbalanced bracket in BaseURL)
- 204 NoContent on endpoint that normally has a body
- 4xx vs 5xx breaker behavior (4xx must NOT trip)
- breaker cooldown elapsed → reset on next success
- all 6 public endpoints fail-fast when breaker is open
This package has no callers in this PR; integration starts in PR-5.
First of 11 PRs implementing the memory-system plugin refactor (RFC #2728).
This PR is pure additive scaffolding — no behavior change, no integration
yet. It defines the wire shape between workspace-server and a memory
plugin so PR-2 (HTTP client) and PR-3 (built-in postgres plugin) can be
built against a single source of truth.
What ships:
- docs/api-protocol/memory-plugin-v1.yaml: OpenAPI 3.0.3 spec covering
/v1/health, namespace upsert/patch/delete, memory commit, search,
forget. Auth-free (private network only); workspace-server is the
only sanctioned client and the security perimeter.
- workspace-server/internal/memory/contract: typed Go bindings with
Validate() methods on every wire object so both client (PR-2) and
server (PR-3) self-check at the boundary.
- Round-trip JSON tests for every type (catch asymmetric tag bugs).
- 5 golden vector files under testdata/ pinning the exact wire shape;
update via UPDATE_GOLDENS=1.
Coverage: 100% of statements in contract.go.
The validation rules encode design decisions worth flagging in review:
- SearchRequest with empty Namespaces is REJECTED at plugin level —
workspace-server is required to intersect the readable set
server-side; an empty list reaching the plugin is a bug.
- NamespacePatch with no fields is REJECTED — empty patches are
pointless round-trips.
- MemoryWrite with whitespace-only Content is REJECTED — zero-info
memories pollute search results.
No code yet calls into this package; integration starts in PR-2.
