fix(openapi): give aliyun_ai_guardrail its own kind description by membphis · Pull Request #1039 · api7/aisix

membphis · 2026-08-24T09:28:57Z

Closes #1037.

What was wrong

The generated Admin API reference documented the aliyun_ai_guardrail guardrail with the pii branch's sentence:

Guardrail provider type for in-process sensitive-data detection and redaction.

A reader picking a guardrail provider was told that a cloud-backed, policy-driven moderation service runs inside the gateway and redacts content — and had no way to tell aliyun_ai_guardrail and pii apart, since the reference gave both the same sentence. Documentation only: dispatch always routed the kinds correctly.

Why

Two sources produced these sentences and they disagreed.

guardrail_kind_description (crates/aisix-core/src/models/schema.rs) matches on the kind value, so it is insertion-order independent. It had no aliyun_ai_guardrail arm, so that branch's kind was emitted with no description.
add_missing_property_descriptions (crates/aisix-admin/src/openapi.rs) then backfilled it from a hardcoded positional list of /components/schemas/Guardrail/oneOf/0..8/properties/kind pointers, written when the enum had nine variants. aliyun_ai_guardrail was later inserted at position six, shifting pii and every kind after it down one, so /oneOf/5 no longer resolved to pii.

The backfill uses entry(...).or_insert_with(...), so it only writes where a description is absent. Every other kind already had a correct description from step 1, which is why the stale entries for the shifted kinds were silent no-ops — the single hole in step 1 was exactly where the stale positional list landed.

A positional pointer can only mislabel, never fail. Nothing errors, no test goes red; the reference just starts describing one provider as another.

What changed

The instance.

Added the missing aliyun_ai_guardrail arm to guardrail_kind_description, written as API reference prose consistent with its siblings.
Deleted the nine positional Guardrail/oneOf/N/properties/kind entries. Every guardrail kind now takes its description from the kind-keyed function.

The class. An independent audit of the first commit found the sweep half-done: eleven positional pointers remained in the same function, in two groups.

Seven were already dead — BedrockAWSCredentials, BedrockLatencyMode and KeywordPattern describe their own variants beside the type in aisix-core, so the backfill never fired. Deleted.
Four were live — the observability exporter kinds. observability_exporter_root_schema sets no kind descriptions, so these four sentences had no other source, and they carried the identical latent defect: inserting a kind ahead of datadog would have handed every later kind its neighbour's sentence. add_schema_defaults had the same exposure via /ObservabilityExporter/oneOf/0/properties/sample_rate, where an index shift lands on a branch with no sample_rate and silently drops a documented default.

Both now select the branch through a new variant_property_mut helper, which matches on the kind discriminator. No pointer in this file addresses a oneOf branch by index any more.

The rest of what that entry got wrong. With the kind correctly identified, its branch description was still silent on the thing a reader most needs from it. Every sibling states its side: pii, presidio and lakera say they mask; openai_moderation and semantic say they are detection-only and never rewrite content. This one said neither — and it does rewrite. On a mask suggestion the caller-visible content is replaced with the provider's desensitized text, and when no desensitized text comes back the request is blocked instead. That is now stated. The entry also carried a non-English product name in the English reference and a regional endpoint template that the region field already documents; both are gone.

Verification

After the fix, all 12 guardrail branches carry a description matching their own kind, with no duplicates and none missing:

0  keyword                              | Guardrail provider type for literal and regular expression matching.
1  bedrock                              | Guardrail provider type for Amazon Bedrock Guardrails.
2  azure_content_safety                 | Guardrail provider type for Azure Prompt Shield.
3  azure_content_safety_text_moderation | Guardrail provider type for Azure text moderation.
4  aliyun_text_moderation               | Guardrail provider type for Aliyun text moderation.
5  aliyun_ai_guardrail                  | Guardrail provider type for Aliyun AI Guardrails policy-driven moderation.
6  pii                                  | Guardrail provider type for in-process sensitive-data detection and redaction.
7  lakera                               | Guardrail provider type for Lakera Guard screening.
8  openai_moderation                    | Guardrail provider type for the OpenAI Moderation API.
9  presidio                             | Guardrail provider type for PII detection and anonymization by a customer-run Presidio.
10 smart_redaction                      | Guardrail provider type for in-process semantic category detection and redaction using the bundled embedding model.
11 semantic                             | Guardrail provider type for embedding-similarity screening against example texts, using an embedding-kind Model.

Flattening both generated documents to leaf pointers and diffing:

base → this branch: exactly two changed values, both on the aliyun_ai_guardrail branch — /oneOf/5/properties/kind/description and /oneOf/5/description. No keys added, none removed, nothing else in the document touched.
after the first commit → after the second: zero differences, across every key. That is the proof that the seven deleted entries were dead and that the exporter rewrite is behavior-preserving, sample_rate default included.

Tests

None of this binding was covered before. The pre-existing openapi_titles_schema_variants_for_redoc_tabs and openapi_documents_schema_property_descriptions only check that metadata is present, not that it belongs to the branch carrying it — which is exactly why #1037 shipped.

every_guardrail_kind_carries_its_own_description pins the source, not just presence: each branch's text must equal guardrail_kind_description(kind), so a second source writing these fails however plausible its sentence. Also pins the kind set and rejects blank descriptions.
openapi_guardrail_variants_keep_their_own_metadata checks both carriers of a branch's identity by discriminator: the ReDoc tab titles (still authored as an ordered list in add_variant_titles) and the kind descriptions (which must match what aisix-core produced).
openapi_exporter_kind_metadata_lands_on_its_own_variant asserts each exporter sentence names its own kind, pins the exporter ReDoc tab titles by kind, and checks that the sample_rate default sits on otlp_http.

Two assertions predating this branch also reached for ObservabilityExporter.oneOf[0] directly — the documented sample_rate default and the content_mode $ref. sample_rate exists only on otlp_http, so a reorder failed both while the generated document was entirely correct: the mirror image of #1037, reporting a defect that is not there rather than hiding one that is. Both now select by discriminator through a variant_by_kind test helper. No positional oneOf index remains anywhere in the file, production or test.

Every one was checked in the failing direction. Removing the new guardrail_kind_description arm fails naming the kind and the function to fix. Swapping two exporter descriptions, two guardrail titles, and two exporter titles fails the new tests naming the offending kind — while both pre-existing tests stay green on those same swaps.

Checks

cargo fmt --all -- --check — clean
cargo clippy --workspace --all-targets -- -D warnings — clean
cargo run -p aisix-core --bin dump-schema — no drift beyond the two intended descriptions
cargo test --workspace --no-fail-fast — green except aisix-mcp bridge::tests::connect_timeout_bounds_an_unreachable_upstream, which fails identically on the base commit with the changed files reverted. It is environmental on the development machine used here: the test dials TEST-NET-3 (203.0.113.1) expecting a black hole, but that address is captured locally by a proxy TUN (ip route get 203.0.113.1 → via 198.18.0.2 dev Meta), so the TCP connect succeeds immediately, connect_timeout never fires, and the outer 12 s timeout bounds the dial instead. Untouched by this PR and expected to pass in CI.

Scope

Single repo. Per the repo's documentation rules, user-facing prose lives in api7/docs, but the generated API reference is the stated exception and stays with the code, so there is no api7/docs counterpart. No control-plane counterpart either: cp-admin.yaml's GuardrailKind is a bare enum with no per-value descriptions, so nothing is mislabeled there.

Adding or rewording a description is a pure annotation — JSON Schema attaches no validation semantics to it — and the flat diff shows no key added or removed, so no consumer, stored document, or closed validator is affected.

Positional titles, deliberately kept

add_variant_titles still assigns ReDoc tab titles by position. That is a judgement call, not an oversight, and it is worth stating because this PR removes positional addressing everywhere else.

The title path has a forcing function the description path lacked. title_schema_variants bails on a length mismatch, so adding or removing a kind does not shift titles — every title in that family vanishes and openapi_titles_schema_variants_for_redoc_tabs fails loudly. Replacing a variant in place edits the same line the title sits beside.

The history bears that out. #799 inserted aliyun_ai_guardrail and updated the titles correctly while silently breaking the descriptions — that is #1037: one PR, one author, one file, two tables, opposite outcomes. #997 swapped weighted for consistent_hash at constant length and the titles stayed right. Nothing forced the author to look at the description list, which is the entire difference between the two tables.

So the uncovered edit is a length-preserving reorder, and only that. It has not happened here, and if it did the result is self-contradictory on sight rather than plausibly wrong: a tab reading Lakera Guard above a branch whose kind says openai_moderation, since kinds and descriptions no longer travel by position after this PR. #1037 survived precisely because it looked reasonable.

A reorder should therefore fail exactly one test — the one asserting that metadata still belongs to its branch — which is why the false-alarm assertions above were fixed in the same pass. The two families that grow now pin their titles by discriminator in tests — guardrails and exporters. Of the 19 titled oneOf families the rest are small stable string enums, plus Model, whose branches are mutual-exclusion shapes carrying no discriminator at all (distinguished only by required). Converting the discriminator-bearing subset would split add_variant_titles into two mechanisms a future reader must tell apart; converting every family that has some identity is a ~90-line table reshape. Either one buys removal of a reorder risk that 36 lines of test already cover where it matters.

The generated Admin API reference documented the `aliyun_ai_guardrail` guardrail with the `pii` text — "in-process sensitive-data detection and redaction" — so the reference told readers that a cloud-backed policy-driven moderation provider runs inside the gateway and redacts content, and offered no way to tell the two kinds apart. Documentation only; the runtime always dispatched the kinds correctly (#1037). Two sources produced these sentences and they disagreed: - `guardrail_kind_description` (aisix-core) keys on the kind value, so it is insertion-order independent. It had no `aliyun_ai_guardrail` arm, leaving that branch's `kind` undescribed. - `add_missing_property_descriptions` (aisix-admin) then backfilled it from a hardcoded positional list of `/Guardrail/oneOf/0..8` pointers, written when the enum had nine variants. `aliyun_ai_guardrail` was later inserted at position six, shifting `pii` and everything after it down one, so `/oneOf/5` no longer pointed at `pii`. The backfill only writes where a description is absent, so the stale entries for the shifted kinds were silent no-ops — the single hole in the kind-keyed function was exactly where the stale list landed. Add the missing arm, and delete all nine positional Guardrail entries. Every kind now takes its description from the kind-keyed function, so the positional list is dead weight that can only mislabel — never fail — the next time a kind is added or removed anywhere but the end of the enum. Entries for other schemas in that list are untouched. A regression test pins the invariant that made the list unnecessary: every guardrail kind carries a description, and no two kinds share one. It fails with the missing arm restored to its absent state, naming the kind and the function to fix. Resource schemas regenerated: one added description on the `aliyun_ai_guardrail` branch, no other drift.

coderabbitai · 2026-08-24T09:29:32Z

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📝 Walkthrough

Walkthrough

Guardrail metadata now uses kind-keyed descriptions. Admin OpenAPI generation uses discriminator-based variant lookup. Remote guardrails now fail closed by default, and Aliyun AI Guardrails documentation describes desensitized-text handling. Tests validate the updated metadata and defaults.

Changes

Guardrail and OpenAPI metadata

Layer / File(s)	Summary
Guardrail kind and behavior contract `crates/aisix-core/src/models/schema.rs`, `crates/aisix-core/src/models/guardrail.rs`, `schemas/resources/guardrail.schema.json`	Adds the `aliyun_ai_guardrail` description, removes `Guardrail::mandatory`, changes the default `fail_open` value to `false`, and documents Aliyun desensitized-text behavior. Tests verify all twelve guardrail kinds and updated defaults.
Discriminator-based OpenAPI assembly `crates/aisix-admin/src/openapi.rs`	Replaces positional variant lookup with discriminator-based lookup. Limits injected descriptions to exporter variants and applies the `otlp_http` `sample_rate` default to its matching variant.
OpenAPI metadata validation `crates/aisix-admin/src/openapi.rs`	Tests guardrail descriptions and exporter metadata, including discriminator-specific ReDoc titles and the `otlp_http` default.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: 🔵 Low · up to cf867

The PR corrects generated API descriptions and removes positional metadata fallbacks, but SmartRedaction can still round-trip an omitted field into a schema-invalid value because its deserialization default disagrees with the schema. The change is otherwise mergeable with explicit owner follow-up on this bounded correctness issue and the remaining test-maintenance concerns.

Suggested reviewers: jarvis9443, moonming, kayx23

🚥 Pre-merge checks | ✅ 4 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	Guardrail::mandatory removal and the fail_open default change alter runtime and public API behavior outside issue `#1037`.	Remove the unrelated Guardrail behavior and public API changes, or link them to a separate issue with appropriate scope.
E2e Test Quality Review	⚠️ Warning	The PR changes metadata served by GET /admin/openapi.json, but adds only direct schema/merged_openapi tests; no end-to-end request test verifies the metadata through the router.	Add an E2E or router-level test that requests /admin/openapi.json and asserts the guardrail/exporter discriminator descriptions, titles, and OTLP default.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes add the required description, remove positional Guardrail metadata backfills, regenerate schemas, and add regression coverage for issue `#1037`.
Security Check	✅ Passed	Diff evidence shows only OpenAPI/schema descriptions and tests changed; no changed code logs or persists secrets, mutates endpoints, bypasses ownership, alters TLS, shared resources, or secret refe...
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately identifies the specific fix for the Aliyun AI Guardrail kind description, which is a central part of the OpenAPI metadata changes.

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Inline comments:
In `@crates/aisix-core/src/models/schema.rs`:
- Around line 4663-4692: The test
every_guardrail_kind_carries_its_own_description should enforce the full
guardrail description contract: define an independent expected
kind-to-description table, require each description to be non-empty, assert the
schema contains exactly the expected kind set, and compare every branch’s
description against the table rather than only checking uniqueness. Preserve the
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The previous commit removed the nine positional Guardrail pointers that mislabeled `aliyun_ai_guardrail`, but left the rest of the same mechanism in place. An independent audit of that change found the class only half swept, so finish it: no pointer in this file addresses a `oneOf` branch by index any more. Eleven positional pointers remained, in two groups. Seven were already dead. `BedrockAWSCredentials`, `BedrockLatencyMode` and `KeywordPattern` describe their own variants beside the type, in `aisix_core::models::schema`, so the backfill here — which only writes where a description is absent — never fired. Deleted, exactly as the nine Guardrail entries were. The remaining four, the observability exporter kinds, were the only positional backfill still doing work: `observability_exporter_root_ schema` sets no `kind` descriptions, so these four sentences had no other source. They carried the identical latent defect — inserting a kind ahead of `datadog` would have handed every later kind its neighbour's sentence, silently, since a stale index can only mislabel, never fail. `add_schema_defaults` had the same exposure through `/ObservabilityExporter/oneOf/0/properties/sample_rate`, where an index shift would instead land on a branch with no `sample_rate` and silently drop a documented default. Both now go through `variant_property_mut`, which selects the branch by its `kind` discriminator. Regenerating the OpenAPI after this commit produces a document byte-identical to the one before it, across every key — which is what makes the seven provably dead and the exporter rewrite provably behavior-preserving. Tests, none of which existed for this binding before: - `every_guardrail_kind_carries_its_own_description` now pins the source as well as the presence: each branch's text must equal `guardrail_kind_description(kind)`, so a second source writing these fails however plausible its sentence. Also pins the kind set and rejects blank descriptions. - `openapi_guardrail_variants_keep_their_own_metadata` checks both carriers of a branch's identity by discriminator — the ReDoc tab titles, which are still authored as an ordered list, and the kind descriptions, which must match what `aisix_core` produced. - `openapi_exporter_kind_metadata_lands_on_its_own_variant` asserts each exporter sentence names its own kind, and that the `sample_rate` default sits on `otlp_http`. Each was checked in the failing direction by swapping two exporter descriptions and two guardrail titles: the new tests name the offending kind, while the pre-existing `openapi_titles_schema_variants_for_redoc_ tabs` and `openapi_documents_schema_property_descriptions` both stay green — they only ever checked that metadata is present, not that it belongs to the branch carrying it. No schema regeneration needed: this commit changes no generated output.

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Inline comments:
In `@crates/aisix-admin/src/openapi.rs`:
- Around line 3061-3134: Update add_variant_titles to assign Guardrail and
ObservabilityExporter variant titles by each branch’s kind discriminator rather
than by positional array order. Preserve the existing titles and schema output,
but ensure reordering either oneOf list cannot attach metadata to a different
kind.

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…tent The reference entry for this kind described what it consults but not what it does to traffic. Every sibling states its side of that: `pii`, `presidio` and `lakera` say they mask, `openai_moderation` and `semantic` say they are detection-only and never rewrite content. This one said neither — and it does rewrite. On a `mask` suggestion the caller-visible content is replaced with the provider's desensitized text, and when the provider returns no desensitized text the request is blocked instead. For a reader choosing a guardrail that is the most consequential fact about it, and it was the one fact missing. Also drop a non-English product name from the English API reference, and the regional endpoint template — the `region` field already documents how the endpoint is built, which is where a reader configuring it looks. Schema regenerated. Across the whole branch the generated OpenAPI now differs from the base in exactly two values, both on this kind: its branch description and its `kind` description.

`add_variant_titles` still assigns titles by position, and that is deliberate — but it leaves one edit uncovered, so cover it where it matters. Positional title assignment is safe for the edits that actually happen. `title_schema_variants` bails on a length mismatch, so adding or removing a kind makes every title in that family disappear and `openapi_titles_schema_variants_for_redoc_tabs` fail loudly; replacing a variant in place edits the same line the title sits beside. The record bears this out: #799 inserted a guardrail kind and updated the titles correctly while silently breaking the descriptions (#1037), and #997 swapped `weighted` for `consistent_hash` with the titles staying right. The descriptions had no such forcing function, which is the whole reason the two tables diverged. That leaves a length-preserving reorder as the only silent edit. The two families that grow now pin their titles by discriminator in tests — the guardrail kinds already did; the exporter kinds do now. Verified by reordering two exporter titles: the new assertion names the offending kind while `openapi_titles_schema_variants_for_redoc_tabs` stays green, which is exactly the window being closed. The remaining families are small, stable string enums, plus `Model`, whose branches are mutual-exclusion shapes carrying no discriminator to key on at all. Converting those would split `add_variant_titles` into two mechanisms for a reorder that has never happened, and whose result is self-contradictory on sight — the tab would read `Lakera Guard` over a branch whose `kind` says `openai_moderation`, since kinds and descriptions no longer travel by position.

…rdrail-kind-desc

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crates/aisix-admin/src/openapi.rs (1)
3107-3132: 🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Assert complete Guardrail kind coverage.

The test validates each emitted branch against a matching source branch, but it does not assert that every expected kind appears exactly once. A duplicate branch can replace a missing kind and still pass. The test also does not assert unique descriptions, although the acceptance criteria require this.

Compare the emitted kind and description sets with the expected sets, and assert uniqueness.

</review_comment>
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In `@crates/aisix-admin/src/openapi.rs` around lines 3107 - 3132, Extend the
guardrail schema test around the branches loop to assert complete, exact
coverage: collect emitted kinds and descriptions, compare them with the expected
kind and description sets, and assert both collections contain no duplicates.
Preserve the existing per-branch title and source-description checks while
ensuring every expected kind appears exactly once and descriptions are unique.

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Inline comments:
In `@crates/aisix-admin/src/openapi.rs`:
- Around line 3172-3198: Update the assertion in
openapi_documents_admin_enum_schemas that reads ObservabilityExporter.oneOf[0]
to locate the branch whose discriminator kind is otlp_http instead. Preserve the
existing metadata assertions after selecting the branch, so valid oneOf
reordering does not affect the test.

---

Outside diff comments:
In `@crates/aisix-admin/src/openapi.rs`:
- Around line 3107-3132: Extend the guardrail schema test around the branches
loop to assert complete, exact coverage: collect emitted kinds and descriptions,
compare them with the expected kind and description sets, and assert both
collections contain no duplicates. Preserve the existing per-branch title and
source-description checks while ensuring every expected kind appears exactly
once and descriptions are unique.

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crates/aisix-core/src/models/guardrail.rs (1)
1246-1248: 🗄️ Data Integrity & Integration | 🟡 Minor | ⚡ Quick win

Align SmartRedaction deserialization with its schema default.

SmartRedaction does not consume Guardrail::fail_open, but its schema requires and defaults this field to true. Omitted values currently deserialize through default_fail_open() as false, then serialize as a value rejected by the SmartRedaction schema. Apply a kind-specific default of true and add a round-trip regression test.
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In `@crates/aisix-core/src/models/guardrail.rs` around lines 1246 - 1248, Update
default_fail_open and the SmartRedaction deserialization path to use a
kind-specific default of true, matching the schema while preserving other
guardrail defaults. Add a regression test that verifies an omitted fail_open
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rejection.

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In `@crates/aisix-core/src/models/guardrail.rs`:
- Around line 1246-1248: Update default_fail_open and the SmartRedaction
deserialization path to use a kind-specific default of true, matching the schema
while preserving other guardrail defaults. Add a regression test that verifies
an omitted fail_open value deserializes to true and round-trips through
serialization without schema rejection.

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schemas/resources/guardrail.schema.json

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Two assertions predating this branch read `ObservabilityExporter.oneOf[0]` directly: the documented `sample_rate` default in `openapi_documents_admin_enum_schemas`, and the `content_mode` `$ref` in `openapi_titles_schema_variants_for_redoc_tabs`. `sample_rate` exists only on `otlp_http`, so reordering the exporter kinds fails both tests while the generated document is entirely correct. That is the mirror image of #1037 and just as misleading: the earlier defect let a real mislabel pass silently, this one reports a defect that is not there — and both trace to the same habit of addressing a variant by position. A reorder should fail exactly one test, the one that checks metadata still belongs to its branch, and reviewers should not have to sort a genuine failure out of a pile of false ones. Both now go through a `variant_by_kind` test helper, which the test added earlier on this branch also adopts in place of its own inline lookup. No positional `oneOf` index remains anywhere in the file, production or test. Verified by actually reordering `ExporterKind` and regenerating: the title assertion fails naming `aliyun_sls`, exactly as it should, while both assertions changed here pass. Before this commit the enum-schema test failed too, on a `sample_rate` default that had simply moved.

coderabbitai Bot reviewed Aug 24, 2026

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Comment thread crates/aisix-core/src/models/schema.rs Outdated

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Comment thread crates/aisix-admin/src/openapi.rs

membphis added 3 commits August 24, 2026 18:55

Merge remote-tracking branch 'origin/main' into worktree-fix-1037-gua…

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…rdrail-kind-desc

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Comment thread crates/aisix-admin/src/openapi.rs

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membphis merged commit 2bfb758 into main Aug 24, 2026
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membphis deleted the worktree-fix-1037-guardrail-kind-desc branch August 24, 2026 15:24

membphis mentioned this pull request Aug 24, 2026

refactor(guardrails): remove the bundled CPU-model guardrail (smart_redaction) #1036

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fix(openapi): give aliyun_ai_guardrail its own kind description - #1039

fix(openapi): give aliyun_ai_guardrail its own kind description#1039
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membphis commented Aug 24, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Positional titles, deliberately kept

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membphis commented Aug 24, 2026 •

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