feat(inference): add anthropic-aws (Claude Platform on AWS) backend#18
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Adds a third FAB_INFERENCE backend, anthropic-aws, alongside api and
bedrock. Claude Platform on AWS (GA 2026-05-11) is Anthropic's first-party
Claude API reached through the adopter's AWS account — IAM/SigV4 auth, AWS
Marketplace billing — with the same canonical model ids as the api path.
- src/inference.ts — extends the InferenceBackend union + the resolver set +
the error string. inferenceEnv('anthropic-aws') returns
CLAUDE_CODE_USE_ANTHROPIC_AWS=1 + the required ANTHROPIC_AWS_WORKSPACE_ID
(read from the env), and fails fast if it's missing or if
CLAUDE_CODE_USE_BEDROCK / _FOUNDRY is set (those take precedence in Claude
Code's provider routing, so silently inferring against the wrong backend is
prevented). resolveModelId is unchanged — non-bedrock backends already pass
canonical ids through.
- src/runtimes/sdk-k8s.ts — forwards ANTHROPIC_AWS_WORKSPACE_ID onto the
session pod so the isolated sdk-k8s loop inherits it.
- docs/transports.md — backend row + example + the opt-in/compliance caveat:
inference runs on Anthropic infra outside the AWS security boundary, so it
is not FedRAMP/IL/HIPAA-ready and stays opt-in per intake; Bedrock remains
the regulated path.
Read only by the in-process sdk runtime, so managed-agents / claude-cli are
unaffected. Verified: typecheck, vitest (267), build, prettier all green.
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What
A third
FAB_INFERENCEbackend —anthropic-aws— alongsideapiandbedrock. Claude Platform on AWS (GA 2026-05-11) is Anthropic's first-party Claude API reached through the adopter's AWS account (IAM/SigV4 auth, AWS Marketplace billing), with the same canonical model ids as theapipath. This is the clean, high-value seam surfaced by thestxkxs/claudiumassessment: in-account first-party Claude, delivered through fab's existing orthogonal inference axis.Changes
src/inference.ts— extends theInferenceBackendunion + resolver set + error string.inferenceEnv('anthropic-aws')returnsCLAUDE_CODE_USE_ANTHROPIC_AWS=1+ the requiredANTHROPIC_AWS_WORKSPACE_ID, and fails fast if it's missing or ifCLAUDE_CODE_USE_BEDROCK/_FOUNDRYis set (those take precedence in Claude Code routing — silently inferring against the wrong backend is prevented).resolveModelIdunchanged (non-bedrock backends already pass canonical ids through).src/runtimes/sdk-k8s.ts— forwardsANTHROPIC_AWS_WORKSPACE_IDonto the session pod.docs/transports.md— backend row + example + compliance caveat (runs on Anthropic infra outside the AWS boundary → not FedRAMP/IL/HIPAA-ready, opt-in per intake; Bedrock stays the regulated path).Read only by the in-process
sdkruntime;managed-agents/claude-cliunaffected.Verification
npm run lint(tsc + eslint),npm test(267 pass, +6 new),npm run build,npm run format:check— all green.