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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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WalkthroughThe pull request adds a namespace-isolation decision record, links it from the README and adds an Unreleased changelog entry. It documents existing namespace behaviour and records that SDK, server and key-format implementation changes are out of scope. ChangesNamespace isolation documentation
Priority: ⬇️ Low Estimated code review effort: 1 (Trivial) | ~5 minutes Change: Other Merge Risk: 🔵 Low · up to Readers could misunderstand namespace handling for PHP or for TS/Rust values containing colons. These are bounded documentation issues; SDK and server behavior are unchanged. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 3 systems. Changed systems: Architecture concerns Review detailsSystems and components
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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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… (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.
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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.
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In @decisions/namespace-isolation.md:
- Line 30: Qualify the feature matrix’s claim that only cachekit-py emits the
`ns:` prefix: note that TypeScript auto mode and Rust namespaced caller-supplied
keys can also produce it when namespaces contain colons, and that the server
parses such keys as namespace-qualified rather than `default`; preserve the
interop-mode exception.
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- Only cachekit-py adds `ns:`, but TS/RS do not reserve the prefixes: a
namespace or caller-supplied key that begins `ns:{name}:` is scoped to
`{name}` (TS always; RS only on a client without `.namespace()`).
- A prefix named `default` gets no grant isolation: `ns:default:` and
`nsapi:default:` share the grant of every unprefixed key.
- Cross-tenant separation has no key-level layer for any key, prefixed or
not; scoped the claim to server-side separation.
- Hand-crafted `ns:` keys via `ck_sdk_`, `nsapi:` writes via `ck_live_`, and
the read vs write scope of an unrestricted key.
- Interop: the segment grammar does not reserve `ns` / `nsapi`.
- Define "TS/RS" once, drop duplicated passages, index the record in README.
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Inline comments:
Review comments at @decisions/namespace-isolation.md:
- Around line 47-50: Update the namespace scope statement in the record to cover
only the documented TS, RS, and interop paths; remove the claim that all
non-Python SDKs, including PHP, share the same namespace behavior or key shape.
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… paths (LAB-640) The feature matrix records no PHP namespace implementation, so the record no longer asserts that PHP behaves like TS and RS. The rule stays general: any SDK whose keys carry no prefix lands in default.
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main now takes changelog entries as one file each in changelog.d/ and fails any non-release PR that edits CHANGELOG.md. Keep main's CHANGELOG.md and move this PR's entry, byte for byte, into changelog.d/20260929_lab-640.md.
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Resolved |
…aces (LAB-640) The interop segment grammar now reserves ns and nsapi. The record no longer says the grammar leaves them open, and points to the feature matrix for which SDK releases enforce the reservation.
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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.
Summary by CodeRabbit
Summary
This PR records and refines the decision record for LAB-640,
decisions/namespace-isolation.md.Server-side namespace isolation is defined as a feature of the Python SDK and the direct API (
nsapi:) only. Namespaces in the TypeScript, Rust and other SDKs, and in interop mode, are client-side conventions. The server scopes those keys to thedefaultopen write space.This is a documentation-only change. It makes no change to the cache-key format, the server or any SDK.
Decision record (
decisions/namespace-isolation.md)Adopted: option 2. The existing asymmetry is documented and no key-format change is made.
Rejected or deferred options:
ns:) is rejected for three reasons:default.Context rewritten to cite spec sections rather than server source file and line references:
cache-key-format.md→ Server-Side Requirementssaas-api.md→ Authenticationinterop-mode.md→ SaaS ConsiderationsNew edge cases documented:
ns:ornsapi:prefixes. A namespace or caller-supplied key that starts withns:is therefore parsed by the server as prefixed.ns:andnsapi:are separate write spaces that share one namespace name for grants and quotas. Reads are open to both key classes. Legacyck_live_keys are exempt from the write-space split.defaultreceives no grant isolation.nsornsapiare unsafe. The server parses these keys as prefixed, and rejects them with400if the operation name contains..Residual risk restated:
defaultbounds all unprefixed traffic as a single pool.Removed content:
Other files
README. The spec index gains two rows:
decisions/namespace-isolation.mdspec/intent-presets.mdCHANGELOG.
default_tenantencryption vector.X-CacheKit-Fresh-Forheader.Cache-Control: no-store/Vary: Authorizationon every response.GET /v1/cache/{key}/ttlreturns{"ttl": null}for a key with no expiry.spec/intent-presets.mdcontract.401versus503responses for authentication.secure.wrap()fails closed.DELETE, the health response shape and the accepted key prefixes.This PR contains two documentation-only changes. Neither changes a spec key format, the server, or any public API.
Namespace isolation decision record (
decisions/namespace-isolation.md, LAB-640)ns:.Wire format fixture note (
spec/wire-format.md, LAB-1750, recorded inCHANGELOG.md)cachekit-corevendors fixture 1.1.0. It pins 1.1.1, sowidth_boundary_bin16_binhas a canonical-writer (lz4_flex) check on both the compressed bytes and the xxh3-64 checksum.*_bintwin's expected marker from its decodedcompressed_datalength. Implementations must not assume bin8 or accept anybinwidth.This pull request documents that server-side namespace isolation is exclusive to the Python SDK and the
nsapi:path, and that TypeScript, Rust and interop-mode namespaces are client-side conventions (LAB-640).Changelog entry (
changelog.d/20260929_lab-640.md)Adds an entry for the new decision record,
decisions/namespace-isolation.md. The entry states:ns:andnsapi:write spaces.default.ns:, and only in auto mode when a namespace is set.defaultopen write space.ns:.Decision record update (
decisions/namespace-isolation.md)The interop section is revised:
nsandnsapias unreserved names in the interop segment grammar, and warned that neither is safe to use as an interop namespace.nsandnsapi. Keys starting withns:ornsapi:would otherwise be parsed as prefixed and scoped to a namespace named after the operation, or rejected with400when the operation contains., rather than falling intodefault.The spec pin that interop keys carry no
ns:prefix is unchanged. Tenant isolation for interop still comes from authentication.Public API impact
None. No key formats, spec definitions or server interfaces are modified.