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docs: add embedding options capability matrix, fix macOS socket drift - #522

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fabrik/issue-504
Aug 27, 2026
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docs: add embedding options capability matrix, fix macOS socket drift#522
verveguy merged 3 commits into
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fabrik/issue-504

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Closes #504

Summary

Adds docs/embedding-options.md, a single reference page answering "what embedding backend should I run, on my platform, and what will it cost me?" — consolidating guidance previously scattered across docs/configuration.md, native/local-inference/README.md, ADR-0006/0016, and the native-embedder spike.

Key changes

  • New page (docs/embedding-options.md): capability matrix (Swift CoreML sidecar, Infinity, Ollama, vLLM/TEI, hosted OpenAI-compatible), each row labeled with its actual verification status rather than presented as uniformly verified (FR-011). Includes sections on: the generic OpenAI-compatible extension point, no-bundled-cross-platform-option for Linux/Windows (linking the spike doc), dimension/schema fixing + model-identity invalidation (cross-referencing Recompute embeddings on WAL replay with a content-addressed cache, instead of replaying stored vectors #440), embedding-vs-extraction separation, and the macOS socket-path distinction.
  • Socket drift fix (docs/configuration.md): adds the previously-missing statement that the Electron liminis app's sidecar binds a separate per-workspace socket (<workspaceRoot>/.liminis/local-inference.sock), not the bare binary's /tmp/liminis-inference.sock auto-discovery default — these are never shared.
  • Cross-links: README.md, docs/index.md's Reference pages list, and docs/configuration.md's Embedder sidecar section all link to the new page.
  • Site plumbing: registered the new page in scripts/generate-docs-llms-full.sh's ORDERED list and site/src/pages-order.mjs, and regenerated docs/llms-full.txt.

Renaming decision (per Plan)

The issue's proposed "Python sentence-transformers" row is presented as Infinity instead — it's the only Python/sentence-transformers-based server in configuration.md's verified-shape list; the repo's only literal sentence-transformers service (embedder_server.py) spoke the now-superseded ADR-0006 wire format.

How to test

  • Read docs/embedding-options.md and confirm each capability-matrix row states platform, install cost, dimension, flag, offline status, auto-probe support, unreachable-at-startup behavior, and verification status.
  • bash scripts/generate-docs-llms-full.sh then git diff --exit-code docs/llms-full.txt — should be clean (already regenerated in this PR).
  • In site/: pnpm install && pnpm build && pnpm links — verifies the new page builds and every internal link resolves (already run locally; 377 internal links checked, all resolve).
  • This is a documentation-only change (ci.yml's docs-only fast path applies — no Rust job runs).

Consolidates the scattered embedding-backend guidance (configuration.md,
native/local-inference/README.md, ADR-0006/0016, the native-embedder spike)
into one page: docs/embedding-options.md. Covers the Swift CoreML sidecar,
Infinity, Ollama, vLLM/TEI, and hosted OpenAI-compatible providers, each
labeled with its actual verification status per FR-011.

Also corrects the drift flagged in the issue: docs/configuration.md never
mentioned that the Electron liminis app binds its own per-workspace socket
rather than sharing /tmp/liminis-inference.sock with a bare binary. Both
docs now state this explicitly.

Links the new page from README.md, docs/index.md, and configuration.md's
Embedder sidecar section, registers it in the site's page order and the
llms-full.txt bundle, and regenerates that bundle.

Closes #504
@verveguy

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🏭 Fabrik — stage: Implement
branch: fabrik/issue-504 | commit: 5619d71 | main: 1779e8e | 2026-08-27 00:02 UTC

No existing PR — I'll emit the FABRIK_PR_CREATE marker for the engine to create the draft PR.


Used 55/100 turns, 5.2M input (100 raw + 5.1M cache-read + 104k cache-write) / 21k output tokens.

@verveguy

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🏭 Fabrik — stage: Review
branch: fabrik/issue-504 | commit: 5619d71 | main: 1779e8e | 2026-08-27 00:05 UTC

Review Findings

Reviewed docs/embedding-options.md and its four supporting cross-links against every source it cites — docs/configuration.md, native/local-inference/README.md, ADR-0006/0016, docs/spikes/native-embedder-2026-05.md, docs/operations.md, and issue #440 — line by line.

Verified

  • All 12 functional requirements (FR-001–FR-012) satisfied, checked against the spec directly:
    • Matrix has 5 rows (Swift CoreML sidecar, Infinity, Ollama, vLLM/TEI combined, hosted OpenAI-compatible) with all 9 required columns.
    • Every factual claim cross-checked against source: dimension 768/BGE-base-en-v1.5, ~500 MB disk figure, fail-fast vs. --mcp-stdio retry-and-degrade behavior, auth-401/403-always-fatal-not-bypassable-by-LCG_EMBEDDING_DIM, dimension-fixed-at-schema-creation, LCG_EMBEDDING_DIM overrides probe failure only — every one matches docs/configuration.md's current text verbatim in substance.
    • swift test and verify-embedding-parity.py (cosine-parity-vs-PyTorch, ≥0.999 threshold on 50 sentences) both exist and do what's claimed.
    • Spike doc's NO-GO (candle) / GO-with-caveats (ort) verdicts confirmed accurate.
    • docs/embedding-sidecar-status.md is not referenced anywhere (FR-012) — confirmed via grep.
  • All internal links resolve. Computed exact github-slugger anchor slugs for every heading referenced (#embedder-sidecar, #http-transport-ci--linux--custom-embedders--hosted-providers, #mcp-client-config-recipes, #switching-an-existing-workspaces-embedder, #extractor-local-or-hosted, #knowledge_status-health-fields) — all match exactly. ADR and spike file paths exist.
  • Site build + link checker: ran pnpm build && pnpm links in site/ — build succeeded, new page rendered at /embedding-options/, and 377 internal links checked, all resolve (matches the PR description's claim). The "no <html> element" lines in the log are pre-existing pagefind warnings on unrelated ADR pages, not caused by this change.
  • docs/llms-full.txt regeneration is clean — re-ran scripts/generate-docs-llms-full.sh, git diff --exit-code docs/llms-full.txt reports no drift.
  • Socket drift fix (FR-008/FR-009): docs/configuration.md's macOS subsection now explicitly names both /tmp/liminis-inference.sock and the Electron app's <workspaceRoot>/.liminis/local-inference.sock, stating they're never shared — matches Background's described drift and SC-002's scope (configuration.md + new page).
  • Verification-status labeling (FR-011) is honest and non-uniform as required: Swift sidecar and OpenAI-hosted presented as verified with real citations; Infinity/Ollama/vLLM-TEI each individually caveated as "not independently verified... relies on the generic OpenAI-compatible contract," matching Research's risk flag about not overstating verification.
  • Rebased cleanly onto origin/main (already up to date, no conflicts).
  • CI: 6/6 checks passing (gh pr checks 522).
  • No external PR review comments to address.

Fixed

None — no issues found. Working tree is already clean and pushed; no changes were needed.

Blocking

None.

This is a documentation-only PR whose every factual claim I traced back to its cited source and found accurate, every link I verified resolves (both via anchor-slug computation and an actual site build + link checker run), and CI is green. Ready for human review.

Reviewed the embedding-options documentation PR: verified all 12 functional requirements against source docs, confirmed every internal link/anchor resolves (via computed slugs and an actual pnpm build && pnpm links run — 377/377 links pass), confirmed llms-full.txt regeneration is clean, and confirmed CI is green. No issues found — no fixes were needed. PR is ready for human review.


Used 43/100 turns, 3.3M input (78 raw + 3.2M cache-read + 87k cache-write) / 11k output tokens.

@handarbeit-pruefer handarbeit-pruefer Bot left a comment

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Reviewed the new docs/embedding-options.md capability matrix, its cross-links from README.md/docs/index.md/docs/configuration.md, the socket-path clarification added to docs/configuration.md, and the site plumbing (scripts/generate-docs-llms-full.sh's ORDERED list, site/src/pages-order.mjs, and the regenerated docs/llms-full.txt, which I confirmed reproduces byte-for-byte via bash scripts/generate-docs-llms-full.sh). All internal anchors referenced from the new page (configuration.md#embedder-sidecar, #http-transport-..., #mcp-client-config-recipes, #switching-an-existing-workspaces-embedder, #extractor-local-or-hosted, operations.md#knowledge_status-health-fields) resolve against existing headers, and the ADR/spike files it links exist. One factual-accuracy issue: the Swift CoreML sidecar row's "Verification" cell cites verify-embedding-parity.py as documented "in native/local-inference/README.md," but that README never mentions the script (no "Tests" section reference, no cosine-parity claim) — the citation doesn't back the claim it's attached to, which is notable given this PR's stated goal (FR-011) is to label verification status accurately rather than assert it uniformly.

Note: this sandbox's git history is a shallow, parent-less clone of the PR head commit, so I could not run git diff main...HEAD; I instead read the changed/new files directly and cross-checked their claims against the rest of the repository's current state.

Comment thread docs/embedding-options.md Outdated
… matrix

The Swift CoreML sidecar row cited verify-embedding-parity.py as
documented in native/local-inference/README.md, but the README never
mentions that script. Point the citation directly at the script file
instead, and note it runs manually rather than via CI.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
@verveguy

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🏭 Fabrik — stage: Review (review feedback addressed)
branch: fabrik/issue-504 | commit: 269873f | main: 1779e8e | 2026-08-27 00:08 UTC

Thread resolved. No issue body changes are needed — this was a citation-accuracy fix within the PR, not a spec change.

Summary

Addressed the review finding from @handarbeit-pruefer[bot]: the Swift CoreML sidecar row's "Verification" cell claimed verify-embedding-parity.py was documented in native/local-inference/README.md, but that README never mentions the script. Fixed by pointing the citation directly at the script file itself (which does genuinely perform the described cosine-parity check) and noting it runs manually rather than via CI, while keeping the swift test citation linking to the README's Tests section (which does document it). Regenerated docs/llms-full.txt, committed as 269873fb, pushed, and resolved the PR review thread.


Threads addressed:

  • docs/embedding-options.md:21 — resolved

Resolved 1 review thread(s) across 2 comment(s).

@verveguy

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🏭 Fabrik — stage: Validate
branch: fabrik/issue-504 | commit: 269873f | main: 1779e8e | 2026-08-27 00:10 UTC

All 6 CI checks pass. Validation is complete — every requirement verified, docs site builds and all links resolve, PR is clean and mergeable.

Validation Report

Requirements: 12/12 passed

  • FR-001: Matrix has 5 rows (Swift CoreML sidecar, Infinity, Ollama, vLLM/TEI, hosted OpenAI-compatible) — verified in docs/embedding-options.md:19-25
  • FR-002: Each row has all 9 required columns (platform, install, cost, dimension, flag, offline, auto-probe, unreachable behavior, verification)
  • FR-003: "Any OpenAI-compatible endpoint" extension-point statement present (lines 33-41)
  • FR-004: Dimension/schema-fixing section present with correct LCG_EMBEDDING_DIM semantics, links to configuration.md#switching-an-existing-workspaces-embedder — heading confirmed to exist at docs/configuration.md:307
  • FR-005: Model-identity section cross-references issue Recompute embeddings on WAL replay with a content-addressed cache, instead of replaying stored vectors #440 and links operations.md#knowledge_status-health-fields — heading confirmed present
  • FR-006: No-bundled-cross-platform statement links the spike doc with correct NO-GO/GO-with-caveats verdicts
  • FR-007: Extraction callout is a separate section (not a matrix row/column), links configuration.md#extractor-local-or-hosted
  • FR-008: New page states both socket paths explicitly and that they're not shared (lines 93-104)
  • FR-009: docs/configuration.md's macOS subsection corrected with the same distinction (diff verified)
  • FR-010: Verified links present in all three required places — README.md, docs/configuration.md (near top of "Embedder sidecar"), docs/index.md "Reference pages" list
  • FR-011: Verification status is honest and non-uniform — Swift sidecar cites real swift test + verify-embedding-parity.py (confirmed script exists and performs cosine-parity check); OpenAI-hosted cites configuration.md's "concrete, verified case" language (confirmed present verbatim); Infinity/Ollama/vLLM-TEI each individually caveated as not independently verified
  • FR-012: Confirmed via grep — zero references to the nonexistent docs/embedding-sidecar-status.md anywhere in the repo

Test Suite: N/A (documentation-only change)

  • Docs site build: clean (pnpm build exit 0)
  • Link checker: 377/377 internal links resolve (pnpm links)
  • docs/llms-full.txt regeneration: clean, no drift after re-running scripts/generate-docs-llms-full.sh
  • All cited anchors independently confirmed to exist by heading grep (#embedder-sidecar, #http-transport-ci--linux--custom-embedders--hosted-providers, #mcp-client-config-recipes, #switching-an-existing-workspaces-embedder, #extractor-local-or-hosted, #knowledge_status-health-fields)

Regressions: None detected

No code changes; diff against origin/main touches only README.md, docs/configuration.md, docs/embedding-options.md (new), docs/index.md, docs/llms-full.txt, scripts/generate-docs-llms-full.sh, site/src/pages-order.mjs, and the spec file.

Branch State

Issues Found

None.

Verdict: READY TO MERGE

Validation passed. PR #522 mergeable: MERGEABLE, mergeStateStatus: CLEAN. All 12 functional requirements verified against source docs, docs site builds cleanly with all 377 internal links resolving, llms-full.txt regeneration is drift-free, and all 6 CI checks pass. No issues found.


Used 31/100 turns, 1.7M input (40 raw + 1.6M cache-read + 77k cache-write) / 5k output tokens.

@handarbeit-pruefer handarbeit-pruefer Bot left a comment

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Reviewed the full diff for PR #522 (docs-only): the new docs/embedding-options.md capability matrix, the socket-drift fix in docs/configuration.md, cross-links from README.md/docs/index.md, and the site-plumbing/llms-full.txt regeneration.

Verified independently: verify-embedding-parity.py's docstring matches its cited description and the prior review thread's citation issue is correctly fixed in the current commit (README no longer claims the script is documented in native/local-inference/README.md); every ADR/spike/anchor link referenced from the new page resolves against the actual file contents (docs/spikes/native-embedder-2026-05.md's candle-NO-GO/ort-GO-with-caveats verdict, docs/operations.md's knowledge_status health-fields anchor, docs/configuration.md's HTTP-transport/MCP-recipes/switching-embedder anchors); the Ollama and vLLM/TEI matrix rows' "listed with a concrete recipe" claims match actual recipe tables in configuration.md; and re-running scripts/generate-docs-llms-full.sh reproduces docs/llms-full.txt byte-for-byte. site/src/pages-order.mjs is confirmed as the single source of truth consumed by astro.config.mjs's nav, so the new page is wired in correctly there too.

No new defects found.

@verveguy
verveguy merged commit d9a095d into main Aug 27, 2026
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🏭 Fabrik merge-train — Landed via batch PR #523.

@verveguy
verveguy deleted the fabrik/issue-504 branch August 27, 2026 00:12
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Document embedding options and conventions: one capability matrix, local and remote

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