feat: add AWS_USE_IMDS support for ambient IAM credential resolution on Bedrock#2307

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ira-at-work wants to merge 15 commits intoThe-PR-Agent:mainfrom

Agrematch:feature/imds-support

Commits on Apr 5, 2026

feat: add AWS_USE_IMDS support for ambient IAM credential resolution
Ira Abramov
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feat: add missing Bedrock model IDs for Sonnet 4.6 and Opus 4.5/4.6
Ira Abramov
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fix: harden IMDS credential handling
Ira Abramov
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test: add unit tests for AWS_USE_IMDS credential support
Ira Abramov
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fix: address PR review feedback on IMDS credential handling

Ira Abramov
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claude
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fix: address self-review findings on IMDS credential handling

Ira Abramov
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test: replace AWS-shaped fake credential values with unambiguous placeholders

Ira Abramov
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fix: two IMDS correctness bugs — stale refresh and missing region export

Ira Abramov
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refactor: extract _write_frozen_creds_to_env; make refresh return bool; fail-fast on refresh error

Ira Abramov
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fix: drop unused 'as e' binding in IMDS credential exception handler

Ira Abramov
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Commits on Apr 12, 2026

refactor: rename IMDS helpers to include aws qualifier

Ira Abramov
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fix: export AWS_SESSION_TOKEN in non-IMDS static credentials path

Ira Abramov
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fix: clear stale AWS_SESSION_TOKEN in IMDS-failed static fallback path

Ira Abramov
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Commits on Apr 15, 2026

fix: narrow except Exception to BotoCoreError in IMDS paths; fix unused var and test exceptions

Ira Abramov
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fix: also catch ClientError in IMDS exception handlers; add ClientError tests

Ira Abramov
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