fix(capability-packages): ETag + 304 for package delivery; immutable version-pinned assets - #5087
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…g + 304, immutable pinned assets (Pasta-Devs#5082) Every installed package's client bundle re-downloaded in full on every app load: /client sent no-cache, must-revalidate with no validator, so the browser had nothing to revalidate against. The manifest already records a trusted sha256 per file (re-verified on every read), which is a perfect strong ETag. - clientEntrypoint()/browserTabAsset() also return the manifest-declared sha256 for the served file (no new lookups, no behavior change) - GET /:id/client: ETag + 304 on If-None-Match; stays no-cache (never immutable — a republished same-version bundle must not be pinned) - GET /:id/assets/*: ETag + 304; public, max-age=31536000, immutable only when ?v= equals the installed version, otherwise byte-for-byte today's private, no-cache, must-revalidate - new tracked regression (regression:capability-cache, in regression:issues): 200-with-ETag, 304 on exact/weak/list validators, different ETag after an update, immutable-only-when-pinned, preserved 404s for unknown packages and undeclared assets - docs: Delivery and caching note in optional-agent-packages.md (docs-i18n mirror to be batched with the round-8 catch-up) No client changes: the dynamic import rides the browser HTTP cache (the ?v= cache key already existed) and 304 revalidation is transparent to it. Closes Pasta-Devs#5082 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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📝 WalkthroughWalkthroughCapability package responses now use manifest SHA-256 values as strong ETags. Client bundles revalidate with ChangesCapability package caching
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The caching change is merge-ready after normal checks, with no actionable merge-blocking risk remaining; a small follow-up could strengthen regression coverage for security headers on 304 responses. Sequence Diagram(s)sequenceDiagram
participant Client
participant CapabilityPackageRoutes
participant CapabilityPackageManager
Client->>CapabilityPackageRoutes: Request package file with If-None-Match
CapabilityPackageRoutes->>CapabilityPackageManager: Resolve file and manifest hash
CapabilityPackageManager-->>CapabilityPackageRoutes: Validated file and SHA-256
CapabilityPackageRoutes-->>Client: 304 response or file with ETag
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Inline comments:
In `@scripts/regressions/capability-package-cache.regression.ts`:
- Around line 100-110: Update the 304 response assertions in the If-None-Match
revalidation tests, including the other 304 case, to verify the
X-Content-Type-Options header equals nosniff alongside the existing status,
body, and ETag checks.
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📒 Files selected for processing (5)
docs/development/optional-agent-packages.mdpackage.jsonpackages/server/src/routes/capability-packages.routes.tspackages/server/src/services/capability-packages/package-manager.service.tsscripts/regressions/capability-package-cache.regression.ts
…ity-package-cache # Conflicts: # package.json
CodeRabbit review on Pasta-Devs#5087: the 304 assertions checked status/body/ETag but not X-Content-Type-Options, so a future header-order change that set headers after the early return would slip past the regression. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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…ity-package-cache # Conflicts: # package.json
…rving CodeQL flagged the package file routes (disk read + hash re-verification per request) as unlimited. They were covered by the global hook's 600/min default bucket, but file-serving deserves its own, stricter class: add a capability-package-files rule (240/min per IP) over /:id/client and /:id/assets/*. Normal loads fetch one bundle per installed package and revalidate with 304s afterwards, so the ceiling leaves ample headroom. The cache regression now registers the real rateLimitHook and pins RateLimit-Limit: 240 on both routes, so the rule cannot silently unmatch. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
3 participants
Closes #5082
Why
Every installed Agent package's client bundle is fully re-downloaded on every app load:
/api/capability-packages/:id/clientsendsCache-Control: no-cache, must-revalidatewith noETag/Last-Modified, so the browser has nothing to revalidate against and must re-fetch the whole body each time. For anyone with World Maps installed that's the full hierarchical-maps bundle on every app open — on phones too — and it makes bundle size a per-boot tax for any future package that ships more client code or art (e.g. a game-surface Experience).The fix costs no freshness: every served package file already has a trusted content hash in
manifest.files[](the serve path re-verifies the bytes against it on every read), which is a perfect strong ETag.What changed
packages/server/src/services/capability-packages/package-manager.service.ts:clientEntrypoint()andbrowserTabAsset()now also return the manifest-declaredsha256for the served file (the declaration they already locate; no new lookups, no behavior change).packages/server/src/routes/capability-packages.routes.ts:GET /:id/client— sendsETag: "<manifest sha256>"and answers a matchingIf-None-Matchwith304. Cache-Control staysno-cache, must-revalidate— deliberately notimmutableeven though the URL carries?v=: a package author (or the catalog) can republish the same version string with different bytes during development, and an immutable client bundle would pin the stale copy with no eviction short of a hard reload.no-cache+ ETag keeps "always revalidate" while making the revalidation answer304instead of re-sending the body.GET /:id/assets/*— same ETag +304support; additionally, when the request carries?v=equal to the installed version, the response ispublic, max-age=31536000, immutable(path + version + manifest hash pin the exact bytes). Requests without the pin keep today'sprivate, no-cache, must-revalidatebyte-for-byte.X-Content-Type-Options: nosniffretained on all responses, including304s.scripts/regressions/capability-package-cache.regression.ts(wired asregression:capability-cache, included inregression:issues): 200-with-ETag,304on exact/weak/listIf-None-Match, full body on mismatch, a different validator after a version update (stale validator must not mask a new bundle), immutable-only-when-pinned asset behavior, and the preserved 404s for unknown packages / undeclared assets.docs/development/optional-agent-packages.md: short "Delivery and caching" note.No client changes: the dynamic
import()inuse-capability-packages.tsrides the normal browser HTTP cache (it already appends?v=<version>, so the cache key was correct all along), and a304revalidation is transparent to it — pinned by the existing capability-client-version-refresh regression.No storage-format change (HTTP headers only). Root
package.jsondiff touchesscriptsonly;pnpm version:checkpasses.Validation
pnpm checkpnpm regression:capability-cache(new)regression:issues)pnpm regression:static-cache(client-static header contract untouched)pnpm version:check200with anETag; a reload sendsIf-None-Matchand gets304with no body; installing a package update returns200with a differentETagand the new bundle hot-swaps as before.Docs note: the
docs/development/optional-agent-packages.mdedit needs a docs-i18n mirror — intended to be batched into the pending round-8 catch-up rather than a standalone[docs-i18n]issue.Summary by CodeRabbit
New Features
304 Not Modifiedresponses.Bug Fixes
Tests