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0b2a26a31d v0.41.35.0 feat(guardrails): vendor-neutral content guardrail seams (supersedes #1652) (#1660)
* feat(guardrails): vendor-neutral content guardrail seams

Expose observe-only guardrail seams at the five boundaries where external
content enters the retrieval layer and the LLM gateway, so a content firewall
(prompt-injection / RAG-poison detector, PII scrubber, etc.) can be hooked in
without binding GBrain to any specific vendor.

New module src/core/guardrails.ts:
  - runGuardrails({ hook, content, metadata }) -> void
  - registerGuardrailProvider / unregisterGuardrailProvider
  - hasGuardrails() fast-path guard for hot paths

Seams (all observe-only, fail-open, inline-await, inert by default):
  - file_storage.markdown  (import-file.ts importFromContent)
  - file_storage.code      (import-file.ts importCodeFile)
  - ai_gateway.chat        (gateway.ts chat, last user message only)
  - ai_gateway.expand      (gateway.ts expand)
  - ai_gateway.tool_input  (gateway.ts toolLoop, before pending-persist)

Invariants enforced by test/guardrails.test.ts (14 tests):
  - returns void; callers never branch on a verdict
  - provider throw/reject is swallowed (fail-open isolation)
  - slow async provider is awaited before resolving (inline)
  - zero providers => no-op; empty/blank content short-circuits
  - content + metadata passed through unmutated; idempotent by id

Hooks pass only the ingest/user-facing payload (md/code body, last user
message, expansion query, tool input). Never system prompts, full history,
tool output, LLM output, embeddings, or multimodal payloads.

Docs: docs/guardrails.md (contract, seam table, provider authoring guide).
OSS ships inert; vendors register a provider in their own package.

* chore: bump version and changelog (v0.41.35.0)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: garrytan-agents <agent@garrytan.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-05-30 12:34:43 -07:00

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