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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: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 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: 2 (Simple) | ~10 minutes Change: Other Merge Risk: ⚪ Minimal · up to The ADR and changelog document the protocol’s namespace and tenant-isolation model without changing SDK or server behavior. No concrete merge-blocking issue is established. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 2 systems. Changed systems: Architecture concerns Review detailsSystems and components
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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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Resolves a CHANGELOG.md adjacent-insertion conflict: main added the SaaS API 401/503 section (LAB-4093) directly under [Unreleased] while this branch added the namespace-isolation decision section (LAB-640) at the same anchor. Resolved as a union, keeping both sections verbatim. Verified lossless: the merged CHANGELOG.md differs from main by +18/-0 (exactly this branch's section) and from this branch's head by +12/-0 (exactly main's section); both sections reproduce byte-identically. spec/saas-api.md is taken from main unchanged and decisions/namespace-isolation.md from this branch unchanged; all test-vectors/ files keep identical blob OIDs on both sides.
bfed94c
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Resolved the Verified lossless before pushing: the merged |
Resolves a CHANGELOG.md adjacent-insertion conflict: main added the keyring conformance-vectors section (LAB-687) directly under [Unreleased] while this branch has the namespace-isolation decision section (LAB-640) at the same anchor. Resolved as a union, keeping both sections verbatim, LAB-640 first. Verified lossless: the merged CHANGELOG.md differs from main by +18/-0 (exactly this branch's section) and from this branch's previous head by +30/-0 (exactly main's section); both sections reproduce byte-identically. Every other path main touched (verify.yml, spec/encryption.md, decisions/key-rotation.md, sdk-feature-matrix.md, test-vectors/encryption.json, tools/) is taken from main unchanged; decisions/namespace-isolation.md from this branch unchanged.
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Resolved |
Resolves a CHANGELOG.md adjacent-insertion conflict: main added the intent presets section directly under [Unreleased] while this branch has the namespace-isolation decision section at the same anchor. Resolved as a union, keeping both sections verbatim, this branch's section first. Verified lossless: the merged CHANGELOG.md differs from main by +18/-0 (exactly this branch's section) and from this branch's previous head by +47/-0 (exactly main's two new sections); both conflicting sections reproduce byte-identically. Every other path main touched (README.md, sdk-feature-matrix.md, spec/encryption.md, spec/intent-presets.md) is taken from main unchanged; decisions/namespace-isolation.md from this branch unchanged.
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Resolved CHANGELOG.md (both [Unreleased] sections kept verbatim) — auto-rebased onto main; CI will re-run. |
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Resolved CHANGELOG.md (both [Unreleased] sections kept verbatim) — auto-rebased onto main; CI will re-run. |
…-640) The Server-Side Requirements section and the feature matrix's namespace-semantics section have landed, so the record no longer describes them as pending. It cites spec sections by anchor instead of line number, so later spec edits cannot leave it stale again. Tightens the security statements to match the published spec: namespace grants isolate a prefixed key only from API keys whose grants are restricted, ns: and nsapi: share one namespace name, legacy ck_live_ keys are exempt from the write-space split, and a quota on default bounds all unprefixed traffic as one pool.
1 participant
Adds
decisions/namespace-isolation.md: one recorded direction for TS/RS namespace isolation. Documentation-only — no key-format change, no server change, no SDK code change.The decision
Server-side namespace isolation on the CachekitIO SaaS (per-API-key namespace grants, per-namespace quotas, the
ns:/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 lands in thedefaultopen write space and is mutually readable and writable within a tenant.Chosen: option 2 — document the asymmetry; change no keys.
ns:) is rejected. It is a cache-key-format change and a key-stability break, which means a billed-miss migration, and it still leaves interop indefault.Interop: interop keys stay in
defaultunder the existing spec pin — tenant isolation comes from authentication, not key parsing. This decision does not change that pin.Residual risk: the isolation gap is accepted and recorded, not closed. Hard isolation between non-Python apps means a separate tenant, or namespace-prefixed (
ns:/nsapi:) keys under a namespace grant. A second API key that still writes unprefixed keys does not isolate anything.Status
The reader-facing docs this decision calls for are already on
main: the Server-Side Requirements section inspec/cache-key-format.md(#17) and the feature matrix's namespace-semantics section (#62). The record cites spec sections by anchor, not line number.Proposed (accepted on merge). If you prefer option 1 or option 3, say so here and the record changes before it merges.
Closes LAB-640.