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Record the stage-1 direction for epic LAB-680: server-side namespace isolation (allowed_namespaces ACL, per-namespace quotas, the ns:/nsapi: write-space split) is driven only by the key prefix, and only cachekit-py emits ns:. So TS/RS SDK namespaces and interop-mode namespaces are client-side conventions, scoped server-side to default/open. Chooses option 2 (document the asymmetry; no key-format change) over option 1 (TS/RS adopt ns: — key-stability break, billed-miss migration, and it still leaves interop in default) and option 3 (per-key default-namespace server override — deferred, reopenable). Interop keys stay in default by the existing spec pin (isolation from authentication, not key parsing). Documentation-only: no spec key-format change, no server change. Proposed (accepted on merge) — the epic owner's merge is the ratification.
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Included review availability: 0 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 1 review per hour. WalkthroughThe pull request adds the LAB-640 namespace-isolation decision record and an Unreleased changelog entry. It documents namespace behaviour, client-side conventions, interop semantics, accepted risks, and excluded implementation changes. ChangesNamespace isolation documentation
Priority: ⬇️ Low Estimated code review effort: 1 (Trivial) | ~5 minutes Change: Other Merge Risk: ⚪ Minimal · up to The documented namespace decision introduces no runtime or deployment changes, and the accepted residual risks are explicitly recorded. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 4
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Inline comments:
In `@CHANGELOG.md`:
- Line 20: Update the changelog wording to state that tenant isolation comes
from authentication, not key parsing, while preserving the existing spec-pin
context.
In `@decisions/namespace-isolation.md`:
- Line 1: Move the breadcrumb below the document’s top-level # heading in the
namespace isolation decision document so it satisfies markdownlint MD041,
preserving the breadcrumb content and the rest of the document.
- Around line 61-64: Update the namespace-isolation statements to explicitly
scope them to TS/RS SDK-generated keys, and limit the API-key access statement
to unprefixed TS/RS SDK and interop traffic so direct API keys such as nsapi:
are excluded.
- Around line 214-216: Update the namespace-isolation documentation to remove
the claim that nsapi: or a separate API key is a hard data-isolation boundary.
Describe nsapi: as write-space separation and a separate API key only as a
mitigation under the documented shared default-data access model, unless an
explicit per-key authorization guarantee is documented.
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CHANGELOG.mddecisions/namespace-isolation.md
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… (LAB-640) - CHANGELOG: "tenant isolation comes from authentication, not key parsing" (was "isolation from authentication", which reversed the relationship). - ADR context: scope the cosmetic-namespace claims to SDK-generated (unprefixed) keys, since a TS/RS app could use direct-API nsapi: keys. - ADR residual risk: stop calling a separate API key / nsapi: a hard data isolation boundary. Grounded in saas apps/cache/src/index.ts: validateNamespaceAccess gates read+write on the namespace (so a prefixed key scoped by allowed_namespaces is real within-tenant isolation), while the ns:/nsapi: write-space split gates writes only (reads open to both classes). The unconditional boundary is a separate tenant; a second API key emitting unprefixed keys shares default and does not isolate.
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Stage-1 keystone of epic LAB-680. Records one direction for TS/RS namespace isolation so the stage-2/3 children have something to build on. Documentation-only ADR — no spec key-format change, no server change, no SDK code change.
The decision
Server-side namespace isolation on the CacheKit SaaS (the
allowed_namespacesACL, per-namespace quotas, thens:/nsapi:write-space split) is driven entirely by the key prefix, and only cachekit-py emitsns:. So TS/RS SDK namespaces, and interop-mode namespaces, are client-side conventions — everything they write is scopednamespace='default',keyClass='open', mutually read/writable within a tenant.Chosen: option 2 — document the asymmetry loudly; change no keys.
ns:) — rejected: cache-key-format change (crypto/protocol gate), key-stability break → billed-miss migration, and it still leaves interop indefault.Interop story (AC2): interop keys stay in
defaultby the existing spec pin — tenant isolation comes from authentication, not key parsing. This decision does not change that pin. (Acceptance of interop keys is already live server-side via saas#91; the staleinterop-mode.mdreject-warning is LAB-646 cleanup.)AC3: no key-format change ⇒ no orphaned-entry/billed-miss migration to schedule; the crypto/protocol gate does not gate implementation. The isolation gap is accepted as a recorded residual risk, not closed — the safe pattern for hard isolation between non-Python apps is a separate tenant or API key, not a namespace ACL.
Review gate
Ran the expert-panel review (Size M +
security) before opening this PR. Surviving findings applied: corrected a mischaracterization of LAB-645 (itsnsapi:-blindness / unreachable-endpoint / GLOB-bleed defects stand — not "working as intended"); generalized the rule to all non-Python SDKs (PHP included), not just TS/RS; reconciled the saas#91 interop-validator status; added the Residual-risk section separating the closed documentation defect from the accepted isolation gap; scoped thensapi:escape hatch to direct-API callers with its opt-in re-key cost.Ratification
Proposed (accepted on merge). The epic owner's merge of this PR is the decision. If you prefer option 1 or option 3, say so here and the stage-2/3 children (LAB-641/642/643/644/645) are re-pointed to match. Please do not treat this as auto-mergeable — I have not merged it.
Closes LAB-640.
Summary by CodeRabbit
Summary
This PR refines the documentation for the TS/RS namespace isolation architecture decision record (ADR) in
LAB-640, sharpening the language around what within-tenant isolation guarantees actually exist for SDK-generated cache keys.Key Changes
Clarified terminology (CHANGELOG.md & namespace-isolation.md):
ns:prefix — not about which SDK/language produced it.More precise isolation guidance (namespace-isolation.md):
ns:ornsapi:) scoped byallowed_namespaces, which gates both reads and writes viavalidateNamespaceAccess, providing real within-tenant isolation — but only for prefixed keys, at the noted opt-in re-key/billed-miss cost.ns:/nsapi:write-space split (which blocks cross-class writes for cache-poisoning defence but leaves reads open, so it is a write-space control rather than read isolation).Purpose
The changes are documentation-only, with no spec key-format change and no server change. The intent is to prevent readers from misreading "documented" as "fixed," and to avoid publishing ineffective mitigations (like restricting a key to
['default']) as if they provide real isolation.