docs(rfc): rfc 0048 — pin the 256-cap semantics; flag streamed-deadline truncation - #712
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…ne truncation Signed-off-by: Jens Holdgaard Pedersen <Jens@holdgaard.org>
Signed-off-by: Jens Holdgaard Pedersen <Jens@holdgaard.org>
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📝 WalkthroughWalkthroughThe change excludes Playwright MCP artifacts from version control. RFC 0048 now documents OpenFGA object-size constraints and tracks validation of streamed deadline-expiry behavior. ChangesRepository hygiene
RFC 0048 clarifications
Estimated code review effort: 1 (Trivial) | ~5 minutes Merge Risk: 🟡 Moderate · up to The RFC currently permits conversation IDs that can produce objects exceeding OpenFGA’s 256-byte limit, causing valid-looking requests to be rejected at runtime. Merge should wait for the full-object check and 114/115-byte boundary tests to be added. Possibly related PRs
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Pull request overview
Updates RFC 0048’s specification text to more precisely document OpenFGA selector-length semantics and to capture an additional open question around streamed deadline behavior, plus ignores Playwright MCP session artefacts.
Changes:
- Clarify that OpenFGA’s 256 cap applies to the full
type:idstring (including the type prefix) and note bytes-vs-characters nuance under an ASCII-only grammar. - Add an open question about whether
OPENFGA_LIST_OBJECTS_DEADLINEexpiry terminates streams with an error frame vs clean EOF (potential silent truncation). - Ignore
.playwright-mcp/in.gitignore.
Reviewed changes
Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| docs/rfcs/0048-graph-operational-surfaces.md | Tightens and sources the 256-cap semantics; adds a streamed-deadline truncation open question. |
| .gitignore | Ignores Playwright MCP session artefacts. |
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Actionable comments posted: 1
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Inline comments:
In `@docs/rfcs/0048-graph-operational-surfaces.md`:
- Around line 102-108: Update conversation_fits to validate the complete
conversation object string, including the conversation: prefix, tenant,
separator, and ID, against MAX_OBJECT_ID_BYTES. Add boundary tests confirming a
114-byte ID is accepted and a 115-byte ID is rejected for a 128-byte tenant.
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Signed-off-by: Jens Holdgaard Pedersen <Jens@holdgaard.org>
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Pull request overview
Copilot reviewed 1 out of 2 changed files in this pull request and generated no new comments.
Suppressed comments (2)
docs/rfcs/0048-graph-operational-surfaces.md:111
- This bullet has a very long line that mixes the pre-production note with the next clause, which breaks the wrapping style used in the surrounding list and makes future edits noisier. Wrap the sentence boundary so the continuation lines stay consistently indented.
Pre-production, this is a `!` change with no dual-read (`feedback: break persisted layouts pre-production`); the
percent-encoding of the *storage path* (`data/tenant_id=<enc>`, RFC 0005
§3.4) is untouched — it is a path rule, not a grammar.
docs/rfcs/0048-graph-operational-surfaces.md:345
- Using an ellipsis in the env-var name (
…_MAX_RESULTS) makes the reference ambiguous and hard to search/grep; elsewhere the RFCs use the full OpenFGA env var name. Spell out the full variable name here too.
streamed endpoint (and `…_MAX_RESULTS` does not — the reason §3.4 of
RFC 0047 chose it), but say nothing about *how* deadline expiry ends
Summary
Folds three answers from the OpenFGA docs assistant (openfga.dev Ask AI, consulted 2026-08-19) into RFC 0048, mirroring the RFC 0047 practice of recording upstream consults in the spec:
type:idstring (proto^[^\s]{2,256}$, openfga/openfga discussion querier returns empty body for ingested clean rows — receiver doesn't persist miner template audit events #302), so the 114-byte conversation-id budget arithmetic is now sourced; bytes-vs-characters is undocumented upstream but moot under the ASCII-only grammar (noted).OPENFGA_LIST_OBJECTS_DEADLINEapplies to the streamed endpoint (and…_MAX_RESULTSdoes not), but how deadline expiry ends the stream — error frame vs clean EOF — is undocumented. The client fails closed on error frames and client-side timeouts but reads clean EOF as complete, so a server-side deadline could silently truncate a scoped set (visibility narrows, never widens). The §3.6 implementation must pin this empirically against a real server..playwright-mcp/session artefacts.Spec-only; no invariant (§3) or hazard (§4) surface is touched — this narrows an already-specified RFC's ambiguity before implementation.
Verification
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