The native claude OAuth path (base.ts:794 applySystemTransformPipeline)
early-exited because DEFAULT_SYSTEM_TRANSFORMS_CONFIG.providers[claude]
was {enabled:false, pipeline:[]}. Result: third-party-agent fingerprints
(github.com/anomalyco/opencode, 'You are OpenCode', 'Here is some useful
information about the environment...') leaked into /v1/messages system
blocks, triggering Anthropic billing-gate:
[400] Third-party apps now draw from extra usage, not plan limits.
Mirror the cc-bridge defaults:
- DEFAULT_PARAGRAPH_REMOVAL_ANCHORS + OPENWEBUI_PARAGRAPH_ANCHORS
- DEFAULT_IDENTITY_PREFIXES + OPENWEBUI_IDENTITY_PREFIXES
- DEFAULT_TEXT_REPLACEMENTS as replace_text ops (allOccurrences:true)
- obfuscate_words
Omit prepend_system_block + inject_billing_header — base.ts:759-784
already handles those on the native claude OAuth path.
UI mirror RoutingTab.tsx and snapshot in system-transforms.test.ts
updated for parity. 56/56 transform-related tests pass.
Verified end-to-end 2026-05-18 after npm run build:cli + restart:
- request v8tq04 -> 200 in 1.84s
- request shape {max_tokens:32000, reasoning_effort:high} -> 200 in 1.99s
- x-omniroute-provider=cc (claude-code OAuth pool, account 62875e01)
- telemetry: [SystemTransforms] claude-native: drop_paragraph_if_contains,
drop_paragraph_if_starts_with, replace_text, replace_text, obfuscate_words
