diff --git a/.github/actions/build-bazel-package-binaries/action.yml b/.github/actions/build-bazel-package-binaries/action.yml
index 0d39389f96..4f705082de 100644
--- a/.github/actions/build-bazel-package-binaries/action.yml
+++ b/.github/actions/build-bazel-package-binaries/action.yml
@@ -18,7 +18,7 @@ runs:
         cache-scope: bazel-release
 
     - name: Install Cargo for workspace metadata
-      uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
 
     - name: Prepare native Windows release dependencies
       if: ${{ runner.os == 'Windows' }}
diff --git a/.github/actions/build-cargo-package-binaries/action.yml b/.github/actions/build-cargo-package-binaries/action.yml
index 7ddab0bd50..a590e6beff 100644
--- a/.github/actions/build-cargo-package-binaries/action.yml
+++ b/.github/actions/build-cargo-package-binaries/action.yml
@@ -39,7 +39,7 @@ runs:
           *) echo "Unsupported build mode: $BUILD_MODE" >&2; exit 1 ;;
         esac
 
-    - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+    - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
       with:
         targets: ${{ inputs.target }}
 
diff --git a/.github/workflows/cargo-deny.yml b/.github/workflows/cargo-deny.yml
index 0f8ebae902..3ea46cc20d 100644
--- a/.github/workflows/cargo-deny.yml
+++ b/.github/workflows/cargo-deny.yml
@@ -18,12 +18,12 @@ jobs:
       - uses: ./.github/actions/setup-ci
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+        uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
 
       - name: Run cargo-deny
         uses: EmbarkStudios/cargo-deny-action@82eb9f621fbc699dd0918f3ea06864c14cc84246 # v2
         with:
-          rust-version: 1.95.0
+          rust-version: 1.99.1
           manifest-path: ./codex-rs/Cargo.toml
 
       - name: Check for a clean worktree
diff --git a/.github/workflows/rust-ci-full-nextest-platform.yml b/.github/workflows/rust-ci-full-nextest-platform.yml
index 03050c6159..83bb4810d9 100644
--- a/.github/workflows/rust-ci-full-nextest-platform.yml
+++ b/.github/workflows/rust-ci-full-nextest-platform.yml
@@ -96,7 +96,7 @@ jobs:
             sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends build-essential pkg-config libcap-dev libasound2-dev bubblewrap
           fi
 
-      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
           targets: ${{ inputs.target }}
 
@@ -323,7 +323,7 @@ jobs:
             sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends pkg-config libcap-dev libasound2-dev bubblewrap
           fi
 
-      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
           targets: ${{ inputs.target }}
 
diff --git a/.github/workflows/rust-ci-full.yml b/.github/workflows/rust-ci-full.yml
index 188165c6c6..568cb68a13 100644
--- a/.github/workflows/rust-ci-full.yml
+++ b/.github/workflows/rust-ci-full.yml
@@ -25,7 +25,7 @@ jobs:
         with:
           persist-credentials: false
       - uses: ./.github/actions/setup-ci
-      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
           components: rustfmt
       - name: cargo fmt
@@ -44,7 +44,7 @@ jobs:
         with:
           persist-credentials: false
       - uses: ./.github/actions/setup-ci
-      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
       - uses: taiki-e/install-action@44c6d64aa62cd779e873306675c7a58e86d6d532 # v2.62.49
         with:
           tool: cargo-shear@1.11.2
@@ -246,7 +246,7 @@ jobs:
             sudo apt-get update -y
             sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends build-essential pkg-config libcap-dev libasound2-dev
           fi
-      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
           targets: ${{ matrix.target }}
           components: clippy
diff --git a/.github/workflows/rust-ci.yml b/.github/workflows/rust-ci.yml
index 55899660b3..dca9b7a0a8 100644
--- a/.github/workflows/rust-ci.yml
+++ b/.github/workflows/rust-ci.yml
@@ -74,7 +74,7 @@ jobs:
         with:
           persist-credentials: false
       - uses: ./.github/actions/setup-ci
-      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
           components: rustfmt
       - name: cargo fmt
@@ -99,7 +99,7 @@ jobs:
         with:
           persist-credentials: false
       - uses: ./.github/actions/setup-ci
-      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
       - uses: taiki-e/install-action@44c6d64aa62cd779e873306675c7a58e86d6d532 # v2.62.49
         with:
           tool: cargo-shear@1.11.2
@@ -123,7 +123,7 @@ jobs:
         with:
           persist-credentials: false
       - uses: ./.github/actions/setup-ci
-      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
       - name: Install nightly argument-comment-lint toolchain
         shell: bash
         run: |
diff --git a/.github/workflows/rust-release-windows.yml b/.github/workflows/rust-release-windows.yml
index b5224edebe..ecf1ccf80c 100644
--- a/.github/workflows/rust-release-windows.yml
+++ b/.github/workflows/rust-release-windows.yml
@@ -106,7 +106,7 @@ jobs:
           Write-Host "Disk usage:"
           Get-PSDrive -PSProvider FileSystem | Format-Table -AutoSize Name, @{Name='Size(GB)';Expression={[math]::Round(($_.Used + $_.Free) / 1GB, 1)}}, @{Name='Free(GB)';Expression={[math]::Round($_.Free / 1GB, 1)}}
       - name: Set up Rust toolchain
-        uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+        uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
           targets: ${{ matrix.build-system == 'cargo' && matrix.target || '' }}
 
diff --git a/.github/workflows/rust-release.yml b/.github/workflows/rust-release.yml
index 79f940f2a3..47580c36b2 100644
--- a/.github/workflows/rust-release.yml
+++ b/.github/workflows/rust-release.yml
@@ -38,7 +38,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
-      - uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+      - uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
       - name: Validate tag matches Cargo.toml version
         shell: bash
         run: |
@@ -189,7 +189,7 @@ jobs:
           sudo apt-get update -y
           sudo DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends binutils pkg-config libcap-dev
       - name: Set up Rust toolchain
-        uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+        uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
           targets: ${{ matrix.build-system == 'cargo' && matrix.target || '' }}
 
diff --git a/.github/workflows/rusty-v8-release.yml b/.github/workflows/rusty-v8-release.yml
index 89e7f7f313..196c99273e 100644
--- a/.github/workflows/rusty-v8-release.yml
+++ b/.github/workflows/rusty-v8-release.yml
@@ -161,9 +161,9 @@ jobs:
           python-version: "3.12"
 
       - name: Set up Rust toolchain for Cargo smoke
-        uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+        uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
-          toolchain: "1.95.0"
+          toolchain: "1.99.1"
           targets: ${{ matrix.target }}
 
       - name: Build Bazel V8 release pair
@@ -324,9 +324,9 @@ jobs:
           architecture: x64
 
       - name: Set up Codex Rust toolchain for Cargo smoke
-        uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+        uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
-          toolchain: "1.95.0"
+          toolchain: "1.99.1"
           targets: ${{ matrix.target }}
 
       - name: Install rusty_v8 Rust toolchain
@@ -416,7 +416,7 @@ jobs:
             cd codex-rs
             RUSTY_V8_ARCHIVE="${GITHUB_WORKSPACE}/${archive}" \
             RUSTY_V8_SRC_BINDING_PATH="${GITHUB_WORKSPACE}/${binding}" \
-            cargo +1.95.0 test -p codex-v8-poc --target "${TARGET}" --features sandbox --no-run
+            cargo +1.99.1 test -p codex-v8-poc --target "${TARGET}" --features sandbox --no-run
           )
 
       - name: Upload staged artifacts
diff --git a/.github/workflows/v8-canary.yml b/.github/workflows/v8-canary.yml
index 2dc088335e..837ac0b40a 100644
--- a/.github/workflows/v8-canary.yml
+++ b/.github/workflows/v8-canary.yml
@@ -179,9 +179,9 @@ jobs:
           python-version: "3.12"
 
       - name: Set up Rust toolchain for Cargo smoke
-        uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+        uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
-          toolchain: "1.95.0"
+          toolchain: "1.99.1"
           targets: ${{ matrix.target }}
 
       - name: Build Bazel V8 release pair
@@ -347,9 +347,9 @@ jobs:
           architecture: x64
 
       - name: Set up Codex Rust toolchain for Cargo smoke
-        uses: dtolnay/rust-toolchain@e081816240890017053eacbb1bdf337761dc5582 # 1.95.0
+        uses: dtolnay/rust-toolchain@d124f86f28ff42855784ff3319f48ac182c248f8 # 1.99.1
         with:
-          toolchain: "1.95.0"
+          toolchain: "1.99.1"
           targets: ${{ matrix.target }}
 
       - name: Install rusty_v8 Rust toolchain
@@ -439,7 +439,7 @@ jobs:
             cd codex-rs
             RUSTY_V8_ARCHIVE="${GITHUB_WORKSPACE}/${archive}" \
             RUSTY_V8_SRC_BINDING_PATH="${GITHUB_WORKSPACE}/${binding}" \
-            cargo +1.95.0 test -p codex-v8-poc --target "${TARGET}" --features sandbox --no-run
+            cargo +1.99.1 test -p codex-v8-poc --target "${TARGET}" --features sandbox --no-run
           )
 
       - name: Upload staged artifacts
diff --git a/MODULE.bazel b/MODULE.bazel
index 8b2726b8dd..1ffbfa19e7 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -322,7 +322,7 @@ toolchains.toolchain(
     edition = "2024",
     extra_exec_rustc_flags = MSVC_RUSTC_FLAGS,
     extra_rustc_flags = MSVC_RUSTC_FLAGS,
-    version = "1.95.0",
+    version = "1.99.1",
 )
 use_repo(toolchains, "default_rust_toolchains")
 
diff --git a/MODULE.bazel.lock b/MODULE.bazel.lock
index 5dba5c34ba..600da0ca9a 100644
--- a/MODULE.bazel.lock
+++ b/MODULE.bazel.lock
@@ -2428,108 +2428,108 @@
       "zvariant_utils_2.1.0": "{\"dependencies\":[{\"name\":\"proc-macro2\",\"req\":\"^1.0.81\"},{\"name\":\"quote\",\"req\":\"^1.0.36\"},{\"features\":[\"extra-traits\",\"full\"],\"name\":\"syn\",\"req\":\"^2.0.64\"}],\"features\":{}}"
     },
     "@@rules_rs+//rs/toolchains:module_extension.bzl%toolchains": {
-      "cargo-1.95.0-aarch64-apple-darwin.tar.xz": "6c2ffed8e1ac9cf4dc9e80f282a869a6b237a153e7c55cca039d33de29d80aaf",
-      "cargo-1.95.0-aarch64-pc-windows-msvc.tar.xz": "e645b30fa035a18aa12d28b699052014c7efa9dd4a33dabd223f0d16b5fa28e8",
-      "cargo-1.95.0-aarch64-unknown-linux-gnu.tar.xz": "7c070aeba9bbf12073646995a03f36c346bb5f541d0078ba6d9dc2a7adaaf6af",
-      "cargo-1.95.0-x86_64-apple-darwin.tar.xz": "e2e1131ade2dddc0d779e0ab3a6a990085c7a654951235742823c3a1ce0f190f",
-      "cargo-1.95.0-x86_64-pc-windows-msvc.tar.xz": "cab2606cb2d0aa31c55d50512fe07a9f15e893227566fbeb448306760cd0d2bf",
-      "cargo-1.95.0-x86_64-unknown-linux-gnu.tar.xz": "e74edd2cf7d0f1f1383b4f00eb90c843750bc489e2ccf7214e6476678a907425",
-      "clippy-1.95.0-aarch64-apple-darwin.tar.xz": "fd183baa023d0c4e0c5b8184226e2d4c85126adf156cb1f3a726ec593bba8d62",
-      "clippy-1.95.0-aarch64-pc-windows-msvc.tar.xz": "44c1b7ada72aa8f3fcaceb37a3899665bc9b160c2fea77879c8ecb65a9e97eba",
-      "clippy-1.95.0-aarch64-unknown-linux-gnu.tar.xz": "fb021e0c0fc2238be9266d7614f4a26bc372544c4cba3528d729ab24ad229fc9",
-      "clippy-1.95.0-x86_64-apple-darwin.tar.xz": "e47367f6b1489d74cbba93b387310adcb82e27a51e44b2c6ff543eb4f199fe32",
-      "clippy-1.95.0-x86_64-pc-windows-msvc.tar.xz": "ddc151d6f58c6658b7380292ecaef36e62d063bbdbf7f5802669810575bb5b75",
-      "clippy-1.95.0-x86_64-unknown-linux-gnu.tar.xz": "ac779bc9839dd47180806b133e4e2563c4a34716284cd5b8fede8ef289f452ca",
-      "rust-analyzer-1.95.0-aarch64-apple-darwin.tar.xz": "11231fc6574301b94bd379af4ef409caef7c65b877bcecf2b227dc0d74aa0ec7",
-      "rust-analyzer-1.95.0-aarch64-pc-windows-msvc.tar.xz": "92958624f23d4b0980748ac9e6d67f6f67a868f8224e8c6240e3f84145e2d805",
-      "rust-analyzer-1.95.0-aarch64-unknown-linux-gnu.tar.xz": "b37e5b9aad624e54228254f98a710ee19ad464fe7ada93ef12e20c87886a0047",
-      "rust-analyzer-1.95.0-x86_64-apple-darwin.tar.xz": "6cd111900e13fd19b188c5d8844b34136af3967066c0ea2914ce5c3508296c85",
-      "rust-analyzer-1.95.0-x86_64-pc-windows-msvc.tar.xz": "ba58e349f5e8b0ef13735c48d4ad8d8c7664472f8403f3c9d97b291bd54a7638",
-      "rust-analyzer-1.95.0-x86_64-unknown-linux-gnu.tar.xz": "a9d71c6e7427c45afcd846a8b34a3e3301ae7a0e91a2bcf929326af77a7dc68e",
-      "rust-src-1.95.0.tar.xz": "67b09138c8db96afc4bbfc69ea771ac9a091fd777698acb43f6dfd9fb7dea363",
-      "rust-std-1.95.0-aarch64-apple-darwin.tar.xz": "9b30089b0f767cb91b2190ffec55a9beeb2a21a1405d8da0f664d7e09d08e6d8",
-      "rust-std-1.95.0-aarch64-apple-ios-macabi.tar.xz": "0e1760828f4e0fa1cde0061ba5680619dcc1cdcafec9242cc18dc4547c73b1cd",
-      "rust-std-1.95.0-aarch64-apple-ios-sim.tar.xz": "4bfe5b0c74c10d121a8ac60f1833c7714b963f9130f6256ca313d94405267deb",
-      "rust-std-1.95.0-aarch64-apple-ios.tar.xz": "6fcc42d8dbba4910a128ffa32d62a730339a7e3882a90341a881f2edf66ff55a",
-      "rust-std-1.95.0-aarch64-linux-android.tar.xz": "de5e8fa5d955809891eea77682811fc90be705f78883bd94071e98f5a738d05b",
-      "rust-std-1.95.0-aarch64-pc-windows-gnullvm.tar.xz": "93d810b8872771afe04f66aa30a4eee48736aca693186e4c7cc2766e1a82e340",
-      "rust-std-1.95.0-aarch64-pc-windows-msvc.tar.xz": "be21b5a8a71c49b4dcbc19956233b0de7bfda3ee3c8a199148299f867e95cb42",
-      "rust-std-1.95.0-aarch64-unknown-fuchsia.tar.xz": "b311a0523f75e031d683d983515edb9baaf22a843dbd44ce2a30a3204752f592",
-      "rust-std-1.95.0-aarch64-unknown-linux-gnu.tar.xz": "3a21b271b1ff973b94d69b25e7a39992f9fbcae1ab6d9475844a23e6ad3908ac",
-      "rust-std-1.95.0-aarch64-unknown-linux-musl.tar.xz": "f6710416ed9a7d5cf2a15efa761eb79a1deeb43f9961bbe05cc97bec4ef9064a",
-      "rust-std-1.95.0-aarch64-unknown-none-softfloat.tar.xz": "54d691468e25e7989b022a171337beadf78b5202877b312b75182b7f93efbb8b",
-      "rust-std-1.95.0-aarch64-unknown-none.tar.xz": "2b0c986dc9902866311f1fe2d44bc2bd84479d2ac84ed7ada76a5eb7ba37080f",
-      "rust-std-1.95.0-aarch64-unknown-uefi.tar.xz": "ca657564103024d345ca32e8e4ade7ebb395a51163d2897d9e5f8373c025e49e",
-      "rust-std-1.95.0-arm-linux-androideabi.tar.xz": "12a9c5fa24608159c2b2bd50abc0c6d0add407c0258cee894c2f61c07051a9c4",
-      "rust-std-1.95.0-arm-unknown-linux-gnueabi.tar.xz": "f6cd592dacdf41f724ee90a2f34db028e37ca2a7fb26fa86e93e8fd68e24d066",
-      "rust-std-1.95.0-arm-unknown-linux-gnueabihf.tar.xz": "fda8408ea17881c6529e27e58672d6c628f786cad557fac92856077e7a610239",
-      "rust-std-1.95.0-arm-unknown-linux-musleabi.tar.xz": "62f21fabc209fd0de53156764fc426da74c59525bb60cb4c1c3ffd1be0bbe00b",
-      "rust-std-1.95.0-arm-unknown-linux-musleabihf.tar.xz": "2842ce67f7a4c68c6e8b30ad3bb36484fb745edcc2694b2a36bf0609cf758044",
-      "rust-std-1.95.0-armv7-linux-androideabi.tar.xz": "61e95e144986c52ff9fa2fe3c249a68b2bf268adb2a2eeb81d80c180e43027f1",
-      "rust-std-1.95.0-armv7-unknown-linux-gnueabi.tar.xz": "e23454d6ca7fc3f5eb7cf9241572765176d86e9f45d4f394de31a5fd794e523f",
-      "rust-std-1.95.0-armv7-unknown-linux-gnueabihf.tar.xz": "bd319e18ca2dad0450f76277874d56356330da536be8cf271509f8e6f28ac6de",
-      "rust-std-1.95.0-armv7-unknown-linux-musleabi.tar.xz": "a49bc987e0531800f92825ce61402b5734ea747caa8970d3373506742ed7daa6",
-      "rust-std-1.95.0-armv7-unknown-linux-musleabihf.tar.xz": "77f9aaff4669c076edc96cdb99dc21749d2c692c862232b52176572c289fe671",
-      "rust-std-1.95.0-i686-linux-android.tar.xz": "e7b5e18d1d4119c7c1454ee8427933f27aeff9e81a22248c2829f5f299d3a937",
-      "rust-std-1.95.0-i686-pc-windows-gnu.tar.xz": "2e98fb94fc500690d7e72e071ce29dd98790ff518163963f5c82c32afba9231d",
-      "rust-std-1.95.0-i686-pc-windows-gnullvm.tar.xz": "b429a8c456d6a1815ece064102bd6a25f67d46db4f6d7b79dbe7d1b9d1f78e0f",
-      "rust-std-1.95.0-i686-pc-windows-msvc.tar.xz": "6206fd7e8bd119e9d1ba1c425ad25c282512eb0d5659f2dcb4be224b84715706",
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+      "rust-std-1.99.1-riscv64gc-unknown-linux-musl.tar.zst": "91bc16ac8aa8dca0d31b265cc1a415c6466a23c2b64011ac6ff5a0373db15b54",
+      "rust-std-1.99.1-riscv64gc-unknown-none-elf.tar.zst": "9e867bda718775ef65463b50fe3b7087d5015b5c81723bb324340696fb57c85a",
+      "rust-std-1.99.1-s390x-unknown-linux-gnu.tar.zst": "9a65f0364576e6b6a2da4ab7837f21e74d6a9209ecef32985a43b65e211f85d0",
+      "rust-std-1.99.1-sparc64-unknown-linux-gnu.tar.zst": "2bb6b172f36c14a1d37ea25b1b68950801c68127f99a011112df3b6e8e51634c",
+      "rust-std-1.99.1-thumbv6m-none-eabi.tar.zst": "d28ceb80e620840fa57f3d8f41e9a56402ad52fa5434732c3acbd58904b5eca2",
+      "rust-std-1.99.1-thumbv7em-none-eabi.tar.zst": "3c32c69396fcbf36aff00896cc58b772cb2a77cfdea30b025e3b2a11c778b290",
+      "rust-std-1.99.1-thumbv7em-none-eabihf.tar.zst": "c78e9336ce33a7251e542b4e3ada30210717f2e18c907937b3ad1858dc1bb454",
+      "rust-std-1.99.1-thumbv7m-none-eabi.tar.zst": "157608e163e109a4f3bc4d9a8a2470816a1d33222efaf7418231ad9ac57d9868",
+      "rust-std-1.99.1-thumbv8m.main-none-eabi.tar.zst": "ba7931fbf6f121d28fb2a51561f357543bd684c87bbce5da3d0d2646b9b4107e",
+      "rust-std-1.99.1-thumbv8m.main-none-eabihf.tar.zst": "0092d540d6404a6756c9f8e97d4e5122eb47d2a0d8c8458a25f63c7d9ef35b7b",
+      "rust-std-1.99.1-wasm32-unknown-emscripten.tar.zst": "af6c15a43d405585393af572813b0e80a5e01ee605f5cd652766dd2337df1f30",
+      "rust-std-1.99.1-wasm32-unknown-unknown.tar.zst": "a6ef28878f6735c7475dbcb94e40d9a0528baabaecb2071455291427100aa933",
+      "rust-std-1.99.1-wasm32-wasip1-threads.tar.zst": "72ab85ed0544435d8a9778cfde04ce4e462edebcbb24863dc58c45f7b6e32293",
+      "rust-std-1.99.1-wasm32-wasip1.tar.zst": "4c56bc7287a631eb4b525174f2304ff3554b40ff119782a15ff486b058981c5b",
+      "rust-std-1.99.1-wasm32-wasip2.tar.zst": "b87d705aaf50f600a8ca1159de715fd512ee5d7dd6389347da95e11879c8a902",
+      "rust-std-1.99.1-x86_64-apple-darwin.tar.zst": "eb191aa683bed4b92e8e5adc2096d3fa3f37379ac6d1c364f3dab4062b553f53",
+      "rust-std-1.99.1-x86_64-apple-ios-macabi.tar.zst": "007354ed595c09c54b71a1ca6ba3693754e481d62b9e0f71d90fbbf7f76a2e33",
+      "rust-std-1.99.1-x86_64-apple-ios.tar.zst": "69a05f7e905ad547e28b13f5683d3fc978ba476836f2ca51af48694d45e62b2f",
+      "rust-std-1.99.1-x86_64-linux-android.tar.zst": "22a42cc6c16f29bd44b2f975dfd66604cd475c094c8cea1eec31581b473a80c3",
+      "rust-std-1.99.1-x86_64-pc-windows-gnu.tar.zst": "bc6f9809863a374883dc5e66be3db2a9bd7f542bce352890549522a4903686c8",
+      "rust-std-1.99.1-x86_64-pc-windows-gnullvm.tar.zst": "1d9f4a27b17a0265a741c3070f303713fc8c819dfff9a89b4b3a835a36ca45d6",
+      "rust-std-1.99.1-x86_64-pc-windows-msvc.tar.zst": "8f5df337576e6f70bcee0d1c0bdc7c220b77941c5af77853f943900d82a65969",
+      "rust-std-1.99.1-x86_64-unknown-freebsd.tar.zst": "463139c89deafd2adf109eac3c4475b45e21738f8c71724fc37197b1412bc58c",
+      "rust-std-1.99.1-x86_64-unknown-fuchsia.tar.zst": "b675736a821472de6f38eb2ab088af58b364d1bef6313cdc3d5ac433c9ea8d05",
+      "rust-std-1.99.1-x86_64-unknown-linux-gnu.tar.zst": "adc8a04f442fa4f3f0e65fe1d2e47b7bed01bc89aad483a1fb7bdf2010067438",
+      "rust-std-1.99.1-x86_64-unknown-linux-musl.tar.zst": "adae09e66335fcd74037c1beea0908b0e44803ca94c622bfc9e7414099c45e1e",
+      "rust-std-1.99.1-x86_64-unknown-netbsd.tar.zst": "41a21f111c66ae80e5fa4fc453c61c74e16de826006156c1175a6c0996d130de",
+      "rust-std-1.99.1-x86_64-unknown-none.tar.zst": "84df751cecaf48f8659367df04aca16279c0a1bfdc70eb80ef79dfc1d7cfc620",
+      "rust-std-1.99.1-x86_64-unknown-uefi.tar.zst": "5c14fb2d07ed2673b745cef72da234c75808169d417183e13fb8cf57ad3909f7",
+      "rustc-1.99.1-aarch64-apple-darwin.tar.zst": "b155c922d82aca2f0eec7a621b29b7d5fedeb73982b47412cba9a00327c85e21",
+      "rustc-1.99.1-aarch64-pc-windows-msvc.tar.zst": "8b94a331f29ae9e935b4834c049b78de2d383a114029f0f3cacc8bb0da1f11e5",
+      "rustc-1.99.1-aarch64-unknown-linux-gnu.tar.zst": "110a1fba2f5ddcfa3e01a96d88fb5098dec1d7eec96a087c8a9088375de02ed8",
+      "rustc-1.99.1-src.tar.zst": "ffd4bb2d950e88ecb0ae36f6d10df2cb9b23dd5f9e87ab76af9215d847a82978",
+      "rustc-1.99.1-x86_64-apple-darwin.tar.zst": "80b990d8fdcd436e2b6162cccf155874145dbff0c41ff77870e480e75b0983c9",
+      "rustc-1.99.1-x86_64-pc-windows-msvc.tar.zst": "bcc7660573e2e12c34b5f1c6f20d7c239ac148bf4e430b59e8e7a761e8bb4080",
+      "rustc-1.99.1-x86_64-unknown-linux-gnu.tar.zst": "193955dbf8a2c7ca6fe06137b0e23644e6f1e05521a6255245c6f7566c4650fb",
+      "rustfmt-1.99.1-aarch64-apple-darwin.tar.zst": "b833d78a13ae0dd329336f07698e2df8c116bf14d797509e747b6583a7e10161",
+      "rustfmt-1.99.1-aarch64-pc-windows-msvc.tar.zst": "d5034dcb9d4a182516d242778b4a2503ee8ca5929ca6fd6eebf559d2868a5bab",
+      "rustfmt-1.99.1-aarch64-unknown-linux-gnu.tar.zst": "37236caceccf8587b49e3efab4f1487f65dc5b8caa544160ae6abb2070a3abb1",
+      "rustfmt-1.99.1-x86_64-apple-darwin.tar.zst": "25b88663ef81fa1995af29bbc47de6305888fb0bb73dc59be84fb691b37db3b6",
+      "rustfmt-1.99.1-x86_64-pc-windows-msvc.tar.zst": "a34cc879b4939f7e84c16c5fe4455f1d350180690a213121b6d918a340cf06ca",
+      "rustfmt-1.99.1-x86_64-unknown-linux-gnu.tar.zst": "d7d99544b898a2d94f3891b4624f3059387c1a15597a3dfdd27ca4d0d2a1b845"
     },
     "@@windows_support+//windows:extensions.bzl%msvc_runtime": {
       "visual_studio_installer_manifest_v1": {
diff --git a/codex-rs/agent-identity/src/lib.rs b/codex-rs/agent-identity/src/lib.rs
index 8323e1d9e7..a580f13d21 100644
--- a/codex-rs/agent-identity/src/lib.rs
+++ b/codex-rs/agent-identity/src/lib.rs
@@ -565,7 +565,6 @@ fn signing_key_from_private_key_pkcs8_base64(private_key_pkcs8_base64: &str) ->
 
 #[cfg(test)]
 mod tests {
-    use base64::Engine as _;
     use ed25519_dalek::Signature;
     use ed25519_dalek::Verifier as _;
     use jsonwebtoken::EncodingKey;
diff --git a/codex-rs/app-server/src/message_processor.rs b/codex-rs/app-server/src/message_processor.rs
index 4bf10fc6cc..33cf7b80c3 100644
--- a/codex-rs/app-server/src/message_processor.rs
+++ b/codex-rs/app-server/src/message_processor.rs
@@ -1289,7 +1289,7 @@ impl MessageProcessor {
                 .clients_revoke(params)
                 .await
                 .map(|response| Some(response.into())),
-            ClientRequest::ConfigRequirementsRead { params: _, .. } => self
+            ClientRequest::ConfigRequirementsRead { .. } => self
                 .config_processor
                 .config_requirements_read()
                 .await
@@ -1358,7 +1358,7 @@ impl MessageProcessor {
                 .model_provider_config_write(params)
                 .await
                 .map(|r| Some(r.into())),
-            ClientRequest::ModelProviderCapabilitiesRead { params: _, .. } => self
+            ClientRequest::ModelProviderCapabilitiesRead { .. } => self
                 .config_processor
                 .model_provider_capabilities_read()
                 .await
@@ -1820,7 +1820,7 @@ impl MessageProcessor {
             ClientRequest::ThreadTimelineList { params, .. } => {
                 self.thread_processor.thread_timeline_list(params).await
             }
-            ClientRequest::ThreadRealtimeListVoices { params: _, .. } => {
+            ClientRequest::ThreadRealtimeListVoices { .. } => {
                 self.turn_processor.thread_realtime_list_voices().await
             }
             ClientRequest::ReviewStart { params, .. } => {
diff --git a/codex-rs/code-mode-protocol/src/grpc/mod.rs b/codex-rs/code-mode-protocol/src/grpc/mod.rs
index f575cab9d6..111049bacd 100644
--- a/codex-rs/code-mode-protocol/src/grpc/mod.rs
+++ b/codex-rs/code-mode-protocol/src/grpc/mod.rs
@@ -1,3 +1,5 @@
+#![allow(clippy::double_must_use)] // Emitted by async_trait in the generated tonic service.
+
 #[cfg(codex_bazel)]
 pub use code_mode_proto::codex::code_mode::v1::*;
 
diff --git a/codex-rs/code-mode-runtime/src/session_runtime/mod.rs b/codex-rs/code-mode-runtime/src/session_runtime/mod.rs
index 06224d5a72..f8da480dbf 100644
--- a/codex-rs/code-mode-runtime/src/session_runtime/mod.rs
+++ b/codex-rs/code-mode-runtime/src/session_runtime/mod.rs
@@ -153,7 +153,7 @@ impl SessionRuntime {
     fn allocate_cell_id(&self) -> Result<CellId, Error> {
         self.inner
             .next_cell_id
-            .fetch_update(Ordering::Relaxed, Ordering::Relaxed, |next_cell_id| {
+            .try_update(Ordering::Relaxed, Ordering::Relaxed, |next_cell_id| {
                 next_cell_id.checked_add(1)
             })
             .map(|cell_id| CellId::new(cell_id.to_string()))
diff --git a/codex-rs/codex-mcp/src/connection_manager/startup.rs b/codex-rs/codex-mcp/src/connection_manager/startup.rs
index 0f019d2760..71a8f4d979 100644
--- a/codex-rs/codex-mcp/src/connection_manager/startup.rs
+++ b/codex-rs/codex-mcp/src/connection_manager/startup.rs
@@ -42,13 +42,14 @@ pub(super) async fn emit_update(
     submit_id: &str,
     tx_event: &Sender<Event>,
     update: McpStartupUpdateEvent,
-) -> Result<(), async_channel::SendError<Event>> {
+) -> Result<(), Box<async_channel::SendError<Event>>> {
     tx_event
         .send(Event {
             id: submit_id.to_string(),
             msg: EventMsg::McpStartupUpdate(update),
         })
         .await
+        .map_err(Box::new)
 }
 
 pub(super) fn mcp_startup_failure_reason(
diff --git a/codex-rs/config/src/thread_config/remote.rs b/codex-rs/config/src/thread_config/remote.rs
index fd616daa27..d207231a87 100644
--- a/codex-rs/config/src/thread_config/remote.rs
+++ b/codex-rs/config/src/thread_config/remote.rs
@@ -20,6 +20,7 @@ use super::ThreadConfigSource;
 use super::UserThreadConfig;
 use proto::thread_config_loader_client::ThreadConfigLoaderClient;
 
+#[allow(clippy::double_must_use)] // Emitted by async_trait in the generated tonic service.
 #[path = "proto/codex.thread_config.v1.rs"]
 mod proto;
 
diff --git a/codex-rs/core/src/exec_policy.rs b/codex-rs/core/src/exec_policy.rs
index fce3479f90..bb1976f123 100644
--- a/codex-rs/core/src/exec_policy.rs
+++ b/codex-rs/core/src/exec_policy.rs
@@ -276,10 +276,13 @@ pub enum ExecPolicyUpdateError {
     JoinBlockingTask { source: tokio::task::JoinError },
 
     #[error("failed to update in-memory rules: {source}")]
-    AddRule {
-        #[from]
-        source: ExecPolicyRuleError,
-    },
+    AddRule { source: ExecPolicyRuleError },
+}
+
+impl From<ExecPolicyRuleError> for ExecPolicyUpdateError {
+    fn from(source: ExecPolicyRuleError) -> Self {
+        Self::AddRule { source }
+    }
 }
 
 pub(crate) struct ExecPolicyManager {
diff --git a/codex-rs/core/src/realtime_conversation.rs b/codex-rs/core/src/realtime_conversation.rs
index 91958831d0..4b258419e7 100644
--- a/codex-rs/core/src/realtime_conversation.rs
+++ b/codex-rs/core/src/realtime_conversation.rs
@@ -367,14 +367,14 @@ impl RealtimeStreamedItem {
             if self.buffered_text.is_empty() {
                 return None;
             }
-            let text = self.buffered_text.drain(..).collect::<String>();
+            let text = std::mem::take(&mut self.buffered_text);
             let text = format!("{prefix}{text}");
             self.sent_bytes += text.len();
             return Some(text);
         }
 
-        let head = self.buffered_text.drain(..).collect::<String>();
-        let tail = self.tail_text.drain(..).collect::<String>();
+        let head = std::mem::take(&mut self.buffered_text);
+        let tail = std::mem::take(&mut self.tail_text);
         let text = format!("{prefix}{head}{HANDOFF_STREAM_TRUNCATION_MARKER}{tail}");
         self.sent_bytes += text.len();
         Some(text)
diff --git a/codex-rs/core/src/tools/executed_tool_calls.rs b/codex-rs/core/src/tools/executed_tool_calls.rs
index d021a52993..d5bc89f5b1 100644
--- a/codex-rs/core/src/tools/executed_tool_calls.rs
+++ b/codex-rs/core/src/tools/executed_tool_calls.rs
@@ -398,7 +398,7 @@ impl ExecutedToolCalls {
     fn reserve_direct_call(&self) -> Option<DirectCallPermit> {
         let recording = Arc::downgrade(&self.lock_state().as_ref()?.recording);
         self.pending_direct_calls
-            .fetch_update(Ordering::Relaxed, Ordering::Relaxed, |pending| {
+            .try_update(Ordering::Relaxed, Ordering::Relaxed, |pending| {
                 (pending < MAX_PENDING_EXECUTED_TOOL_CALLS).then_some(pending + 1)
             })
             .ok()?;
diff --git a/codex-rs/core/tests/common/apps_test_server.rs b/codex-rs/core/tests/common/apps_test_server.rs
index 3d090cbdea..b51231602a 100644
--- a/codex-rs/core/tests/common/apps_test_server.rs
+++ b/codex-rs/core/tests/common/apps_test_server.rs
@@ -565,7 +565,7 @@ impl Respond for CodexAppsJsonRpcResponder {
                     .as_ref()
                     .is_some_and(|remaining| {
                         remaining
-                            .fetch_update(Ordering::SeqCst, Ordering::SeqCst, |remaining| {
+                            .try_update(Ordering::SeqCst, Ordering::SeqCst, |remaining| {
                                 remaining.checked_sub(1)
                             })
                             .is_ok()
diff --git a/codex-rs/core/tests/suite/scenarios.rs b/codex-rs/core/tests/suite/scenarios.rs
index 171054ad85..945ae1f2e9 100644
--- a/codex-rs/core/tests/suite/scenarios.rs
+++ b/codex-rs/core/tests/suite/scenarios.rs
@@ -4008,7 +4008,8 @@ async fn astra_async_compaction_keeps_work_added_after_its_snapshot(
     )
     .await?;
     assert_eq!(compaction_events.len(), if over_budget { 4 } else { 2 });
-    for pair in compaction_events.chunks_exact(2) {
+    const EVENTS_PER_COMPACTION: usize = 2;
+    for pair in compaction_events.as_chunks::<EVENTS_PER_COMPACTION>().0 {
         assert_eq!((pair[0].0, pair[1].0), ("started", "completed"));
         assert_eq!(pair[0].1, pair[1].1);
     }
diff --git a/codex-rs/core/tests/suite/tools.rs b/codex-rs/core/tests/suite/tools.rs
index b183492c15..a53266debe 100644
--- a/codex-rs/core/tests/suite/tools.rs
+++ b/codex-rs/core/tests/suite/tools.rs
@@ -688,7 +688,7 @@ async fn sandbox_denied_exec_command_returns_original_output() -> Result<()> {
         "printf {sentinel:?} >&2; printf {content:?} > {path:?}",
         sentinel = format!("{sentinel}\n"),
         content = "sandbox denied",
-        path = &target_path
+        path = target_path
     );
     let args = json!({
         "cmd": command,
diff --git a/codex-rs/diagnostics/src/lib.rs b/codex-rs/diagnostics/src/lib.rs
index a966e4aee5..91b878b390 100644
--- a/codex-rs/diagnostics/src/lib.rs
+++ b/codex-rs/diagnostics/src/lib.rs
@@ -32,7 +32,7 @@ impl Gauge {
     pub fn decrement(&self) {
         let _ = self
             .value
-            .fetch_update(Ordering::Relaxed, Ordering::Relaxed, |value| {
+            .try_update(Ordering::Relaxed, Ordering::Relaxed, |value| {
                 Some(value.saturating_sub(1))
             });
     }
diff --git a/codex-rs/exec-server-protocol/src/protocol.rs b/codex-rs/exec-server-protocol/src/protocol.rs
index 5ff06e05f8..8d94c15955 100644
--- a/codex-rs/exec-server-protocol/src/protocol.rs
+++ b/codex-rs/exec-server-protocol/src/protocol.rs
@@ -273,7 +273,7 @@ impl EnvironmentInfo {
             if let Some(path) = std::env::var_os(name)
                 .filter(|path| !path.is_empty())
                 .filter(|path| cfg!(unix) || std::path::Path::new(path).is_absolute())
-                .and_then(&normalize_temp_path)
+                .and_then(normalize_temp_path)
                 && !temporary_directories.contains(&path)
             {
                 temporary_directories.push(path);
diff --git a/codex-rs/exec/src/lib.rs b/codex-rs/exec/src/lib.rs
index bb01fc3568..3479ea4bcd 100644
--- a/codex-rs/exec/src/lib.rs
+++ b/codex-rs/exec/src/lib.rs
@@ -2459,10 +2459,8 @@ fn decode_utf16(
         return Err(PromptDecodeError::InvalidUtf16 { encoding });
     }
 
-    let units: Vec<u16> = input
-        .chunks_exact(2)
-        .map(|chunk| decode_unit([chunk[0], chunk[1]]))
-        .collect();
+    let (units, _) = input.as_chunks();
+    let units: Vec<_> = units.iter().copied().map(decode_unit).collect();
 
     String::from_utf16(&units).map_err(|_| PromptDecodeError::InvalidUtf16 { encoding })
 }
diff --git a/codex-rs/ext/skills/src/provider/executor.rs b/codex-rs/ext/skills/src/provider/executor.rs
index 01292d9cbb..1a2794ab77 100644
--- a/codex-rs/ext/skills/src/provider/executor.rs
+++ b/codex-rs/ext/skills/src/provider/executor.rs
@@ -302,10 +302,10 @@ async fn read_bounded_text(
     let mut stream = file_system
         .read_file_stream(path)
         .await
-        .map_err(&read_error)?;
+        .map_err(read_error)?;
     let mut contents = Vec::new();
     while let Some(chunk) = stream.next().await {
-        let chunk = chunk.map_err(&read_error)?;
+        let chunk = chunk.map_err(read_error)?;
         if contents.len().saturating_add(chunk.len()) > MAX_SKILL_RESOURCE_CONTENT_BYTES {
             return Err(SkillProviderError::new(format!(
                 "executor skill resource {resource} exceeds {MAX_SKILL_RESOURCE_CONTENT_BYTES} bytes"
diff --git a/codex-rs/external-agent-migration/src/mcp.rs b/codex-rs/external-agent-migration/src/mcp.rs
index eb820ce247..46889af75a 100644
--- a/codex-rs/external-agent-migration/src/mcp.rs
+++ b/codex-rs/external-agent-migration/src/mcp.rs
@@ -222,7 +222,8 @@ fn mcp_server_toml_table(
         if let Some(env) = server_config.get("env").and_then(JsonValue::as_object) {
             append_env_config(&mut table, env)?;
         }
-    } else if let Some(url) = server_config.get("url").and_then(json_string) {
+    } else {
+        let url = server_config.get("url").and_then(json_string)?;
         if !matches!(
             transport_type,
             None | Some("http") | Some("streamable_http")
@@ -236,8 +237,6 @@ fn mcp_server_toml_table(
         if let Some(headers) = server_config.get("headers").and_then(JsonValue::as_object) {
             append_header_config(&mut table, headers)?;
         }
-    } else {
-        return None;
     }
 
     Some(table)
diff --git a/codex-rs/rust-toolchain.toml b/codex-rs/rust-toolchain.toml
index 910c65114e..d73899d67f 100644
--- a/codex-rs/rust-toolchain.toml
+++ b/codex-rs/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.95.0"
+channel = "1.99.1"
 components = ["clippy", "rustfmt", "rust-src"]
diff --git a/codex-rs/sandboxing/src/seatbelt_tests.rs b/codex-rs/sandboxing/src/seatbelt_tests.rs
index b8219878f9..cb58967dcf 100644
--- a/codex-rs/sandboxing/src/seatbelt_tests.rs
+++ b/codex-rs/sandboxing/src/seatbelt_tests.rs
@@ -2026,7 +2026,7 @@ fn create_seatbelt_args_with_read_only_git_and_codex_subpaths() {
     assert!(
         !output.status.success(),
         "command to write {} should fail under seatbelt",
-        &config_toml.display()
+        config_toml.display()
     );
     assert_seatbelt_denied(&output.stderr, &config_toml);
 
@@ -2070,7 +2070,7 @@ fn create_seatbelt_args_with_read_only_git_and_codex_subpaths() {
     assert!(
         !output.status.success(),
         "command to write {} should fail under seatbelt",
-        &pre_commit_hook.display()
+        pre_commit_hook.display()
     );
     assert_seatbelt_denied(&output.stderr, &pre_commit_hook);
 
@@ -2114,7 +2114,7 @@ fn create_seatbelt_args_with_read_only_git_and_codex_subpaths() {
     assert!(
         output.status.success(),
         "command to write {} should succeed under seatbelt",
-        &allowed_file.display()
+        allowed_file.display()
     );
     assert_eq!(
         "this is allowed\n",
diff --git a/codex-rs/scripts/setup-windows.ps1 b/codex-rs/scripts/setup-windows.ps1
index a8fe0c2f75..9567b2993d 100644
--- a/codex-rs/scripts/setup-windows.ps1
+++ b/codex-rs/scripts/setup-windows.ps1
@@ -179,7 +179,7 @@ if (-not (Ensure-Command 'cargo')) {
 Write-Host "==> Configuring Rust toolchain per rust-toolchain.toml" -ForegroundColor Cyan
 
 # Pin to the workspace toolchain and install components
-$toolchain = '1.95.0'
+$toolchain = '1.99.1'
 & rustup toolchain install $toolchain --profile minimal | Out-Host
 & rustup default $toolchain | Out-Host
 & rustup component add clippy rustfmt rust-src --toolchain $toolchain | Out-Host
diff --git a/codex-rs/shell-command/src/bash.rs b/codex-rs/shell-command/src/bash.rs
index ddd5807bfc..d092127c55 100644
--- a/codex-rs/shell-command/src/bash.rs
+++ b/codex-rs/shell-command/src/bash.rs
@@ -88,11 +88,8 @@ pub fn try_parse_word_only_commands_sequence(tree: &Tree, src: &str) -> Option<V
 
     let mut commands = Vec::new();
     for node in command_nodes {
-        if let Some(words) = parse_plain_command_from_node(node, src) {
-            commands.push(words);
-        } else {
-            return None;
-        }
+        let words = parse_plain_command_from_node(node, src)?;
+        commands.push(words);
     }
     Some(commands)
 }
diff --git a/codex-rs/tui/src/app/tests/session_lifecycle_requests.rs b/codex-rs/tui/src/app/tests/session_lifecycle_requests.rs
index ae64dcdc4c..8d2fdd1893 100644
--- a/codex-rs/tui/src/app/tests/session_lifecycle_requests.rs
+++ b/codex-rs/tui/src/app/tests/session_lifecycle_requests.rs
@@ -2825,7 +2825,8 @@ async fn older_external_server_starts_without_unsupported_dynamic_tools_or_histo
 
     let starts = recorded_params(&requests, "thread/start");
     assert_eq!(starts.len(), 6);
-    for attempts in starts.chunks_exact(3) {
+    const ATTEMPTS_PER_START: usize = 3;
+    for attempts in starts.as_chunks::<ATTEMPTS_PER_START>().0 {
         assert_eq!(attempts[0]["dynamicTools"][0]["type"], "namespace");
         assert_eq!(attempts[0]["historyMode"], "paginated");
         assert_eq!(attempts[1]["dynamicTools"], serde_json::Value::Null);
diff --git a/codex-rs/tui/src/bottom_pane/async_questions/layout.rs b/codex-rs/tui/src/bottom_pane/async_questions/layout.rs
index 327d1e9954..ab5e17adad 100644
--- a/codex-rs/tui/src/bottom_pane/async_questions/layout.rs
+++ b/codex-rs/tui/src/bottom_pane/async_questions/layout.rs
@@ -52,7 +52,7 @@ impl AsyncQuestions {
         let mut spacer_after_input = 0;
         let progress_height;
         let footer_lines;
-        let notes_height;
+        let mut notes_height = 0;
 
         if has_options {
             let min_options_height = remaining.min(1);
@@ -71,7 +71,6 @@ impl AsyncQuestions {
             spacer_after_question = u16::from(remaining > 0);
             remaining -= spacer_after_question;
             options_height += remaining.min(full_options_height.saturating_sub(options_height));
-            notes_height = 0;
         } else {
             // Freeform answers take their preferred input height before hints and progress.
             let preferred_notes = self
diff --git a/codex-rs/tui/src/bottom_pane/list_selection_view.rs b/codex-rs/tui/src/bottom_pane/list_selection_view.rs
index 5b10995f14..b59beba74b 100644
--- a/codex-rs/tui/src/bottom_pane/list_selection_view.rs
+++ b/codex-rs/tui/src/bottom_pane/list_selection_view.rs
@@ -1119,7 +1119,7 @@ impl ListSelectionView {
             None
         }
         .or_else(|| self.footer_note.clone());
-        let mut lines = note.map(&wrap).unwrap_or_default();
+        let mut lines = note.map(wrap).unwrap_or_default();
         if self.reserve_result_rows && show_selected_description {
             let height = self
                 .items
diff --git a/codex-rs/tui/src/bottom_pane/request_user_input/snapshots/codex_tui__bottom_pane__request_user_input__render__tests__request_user_input_halfwidth_sound_marks_truncation.snap b/codex-rs/tui/src/bottom_pane/request_user_input/snapshots/codex_tui__bottom_pane__request_user_input__render__tests__request_user_input_halfwidth_sound_marks_truncation.snap
index 4dc0fc13b7..1efcc1a62e 100644
--- a/codex-rs/tui/src/bottom_pane/request_user_input/snapshots/codex_tui__bottom_pane__request_user_input__render__tests__request_user_input_halfwidth_sound_marks_truncation.snap
+++ b/codex-rs/tui/src/bottom_pane/request_user_input/snapshots/codex_tui__bottom_pane__request_user_input__render__tests__request_user_input_halfwidth_sound_marks_truncation.snap
@@ -22,12 +22,12 @@ Buffer {
 [
     Line::from_iter([
         Span::from("ab").bold(),
-        Span::from("ｶ\u{ff9e}").cyan(),
+        Span::from("ｶﾞ").cyan(),
         Span::from("…").cyan(),
     ]),
     Line::from_iter([
         Span::from("xy").bold(),
-        Span::from("ﾊ\u{ff9f}").magenta(),
+        Span::from("ﾊﾟ").magenta(),
         Span::from("…").magenta(),
     ]),
 ]
diff --git a/codex-rs/tui/src/pager_overlay.rs b/codex-rs/tui/src/pager_overlay.rs
index 6f0d2f4041..5491371388 100644
--- a/codex-rs/tui/src/pager_overlay.rs
+++ b/codex-rs/tui/src/pager_overlay.rs
@@ -149,8 +149,10 @@ fn render_navigation_hints(area: Rect, buf: &mut Buffer, keymap: &PagerKeymap) {
         ("jump_top", &keymap.jump_top),
         ("jump_bottom", &keymap.jump_bottom),
     ];
-    let hints = actions
-        .chunks_exact(2)
+    const ACTIONS_PER_HINT: usize = 2;
+    let (action_groups, _) = actions.as_chunks::<ACTIONS_PER_HINT>();
+    let hints = action_groups
+        .iter()
         .zip(["to scroll", "to page", "to jump"])
         .map(|(actions, description)| {
             (
diff --git a/codex-rs/tui/src/pets/sixel.rs b/codex-rs/tui/src/pets/sixel.rs
index 624fd7bc16..f82998f49c 100644
--- a/codex-rs/tui/src/pets/sixel.rs
+++ b/codex-rs/tui/src/pets/sixel.rs
@@ -216,7 +216,8 @@ struct Palette {
 impl Palette {
     fn from_rgba(rgba: &[u8]) -> Self {
         let mut used = [false; PALETTE_COLOR_COUNT];
-        for pixel in rgba.chunks_exact(4) {
+        const RGBA_CHANNELS: usize = 4;
+        for pixel in rgba.as_chunks::<RGBA_CHANNELS>().0 {
             if pixel[3] < TRANSPARENT_ALPHA_THRESHOLD {
                 continue;
             }
diff --git a/codex-rs/utils/path-uri/src/api_path_string.rs b/codex-rs/utils/path-uri/src/api_path_string.rs
index b2ecdf0aed..db4d8b664f 100644
--- a/codex-rs/utils/path-uri/src/api_path_string.rs
+++ b/codex-rs/utils/path-uri/src/api_path_string.rs
@@ -262,10 +262,8 @@ fn render_windows_opaque_fallback(path_bytes: &[u8]) -> Option<String> {
     if !path_bytes.len().is_multiple_of(2) {
         return None;
     }
-    let path_wide = path_bytes
-        .chunks_exact(2)
-        .map(|bytes| u16::from_le_bytes([bytes[0], bytes[1]]))
-        .collect::<Vec<_>>();
+    let (units, _) = path_bytes.as_chunks();
+    let path_wide: Vec<_> = units.iter().copied().map(u16::from_le_bytes).collect();
 
     // Windows absolute paths either have a rooted drive prefix (`C:\\`) or a
     // rooted namespace/UNC prefix (`\\server`, `\\.\\`, or `\\?\\`).
diff --git a/codex-rs/utils/path-uri/src/lib.rs b/codex-rs/utils/path-uri/src/lib.rs
index 7a42363dd1..200d4822cf 100644
--- a/codex-rs/utils/path-uri/src/lib.rs
+++ b/codex-rs/utils/path-uri/src/lib.rs
@@ -586,10 +586,8 @@ impl PathUri {
             let decoded_path = {
                 use std::os::windows::ffi::OsStringExt;
                 path_bytes.len().is_multiple_of(2).then(|| {
-                    let path_wide = path_bytes
-                        .chunks_exact(2)
-                        .map(|bytes| u16::from_le_bytes([bytes[0], bytes[1]]))
-                        .collect::<Vec<_>>();
+                    let (units, _) = path_bytes.as_chunks();
+                    let path_wide: Vec<_> = units.iter().copied().map(u16::from_le_bytes).collect();
                     std::path::PathBuf::from(std::ffi::OsString::from_wide(&path_wide))
                 })
             };
@@ -818,9 +816,8 @@ fn infer_opaque_path_convention(path_bytes: &[u8]) -> Option<PathConvention> {
         return None;
     }
 
-    let mut path_wide = path_bytes
-        .chunks_exact(2)
-        .map(|bytes| u16::from_le_bytes([bytes[0], bytes[1]]));
+    let (units, _) = path_bytes.as_chunks();
+    let mut path_wide = units.iter().copied().map(u16::from_le_bytes);
     let first = path_wide.next()?;
     let second = path_wide.next()?;
     let has_drive = u8::try_from(first).is_ok_and(|drive| drive.is_ascii_alphabetic())
diff --git a/codex-rs/utils/stream-parser/src/inline_hidden_tag.rs b/codex-rs/utils/stream-parser/src/inline_hidden_tag.rs
index 0e0d44b427..ccb08d8637 100644
--- a/codex-rs/utils/stream-parser/src/inline_hidden_tag.rs
+++ b/codex-rs/utils/stream-parser/src/inline_hidden_tag.rs
@@ -92,7 +92,7 @@ where
             .iter()
             .map(|spec| longest_suffix_prefix_len(pending, spec.open))
             .max()
-            .map_or(0, std::convert::identity)
+            .unwrap_or(0)
     }
 
     fn push_visible_prefix(out: &mut StreamTextChunk<ExtractedInlineTag<T>>, pending: &str) {
diff --git a/codex-rs/voice-host/src/input_channel_tests.rs b/codex-rs/voice-host/src/input_channel_tests.rs
index e3c7807f63..9112332c73 100644
--- a/codex-rs/voice-host/src/input_channel_tests.rs
+++ b/codex-rs/voice-host/src/input_channel_tests.rs
@@ -16,12 +16,8 @@ fn microphone_selection_excludes_playback_channels() {
     plugged_in[3] = 0.7;
     let mut unplugged = plugged_in;
     unplugged[0] = 0.0;
-    let interleaved = [plugged_in, unplugged].concat();
-    let captured: Vec<_> = interleaved
-        .chunks_exact(/*chunk_size*/ 16)
-        .map(|frame| source.sample(frame))
-        .collect();
-    assert_eq!(captured, vec![0.25, 0.0]);
+    let captured = [source.sample(&plugged_in), source.sample(&unplugged)];
+    assert_eq!(captured, [0.25, 0.0]);
 }
 
 #[test]
diff --git a/codex-rs/voice-host/src/playback.rs b/codex-rs/voice-host/src/playback.rs
index 199abfa5a9..be796b97c0 100644
--- a/codex-rs/voice-host/src/playback.rs
+++ b/codex-rs/voice-host/src/playback.rs
@@ -67,8 +67,8 @@ impl PlaybackWriter {
             at: Instant::now(),
             generation: self.epoch,
         };
-        for (sample, bytes) in frame.samples.iter_mut().zip(bytes.chunks_exact(4)) {
-            *sample = f32::from_le_bytes(bytes.try_into().map_err(|_| "invalid speaker buffer")?);
+        for (sample, bytes) in frame.samples.iter_mut().zip(bytes.as_chunks().0) {
+            *sample = f32::from_le_bytes(*bytes);
             if !sample.is_finite() {
                 return Err("invalid speaker sample");
             }
diff --git a/codex-rs/websocket-auth/src/lib.rs b/codex-rs/websocket-auth/src/lib.rs
index 5a062ffdcb..03cbfd61d7 100644
--- a/codex-rs/websocket-auth/src/lib.rs
+++ b/codex-rs/websocket-auth/src/lib.rs
@@ -444,7 +444,9 @@ fn sha256_digest_arg(flag_name: &str, value: &str) -> anyhow::Result<[u8; 32]> {
     }
 
     let mut digest = [0u8; 32];
-    for (index, pair) in trimmed.as_bytes().chunks_exact(2).enumerate() {
+    const HEX_DIGITS_PER_BYTE: usize = 2;
+    let (pairs, _) = trimmed.as_bytes().as_chunks::<HEX_DIGITS_PER_BYTE>();
+    for (index, pair) in pairs.iter().enumerate() {
         let high = hex_nibble(flag_name, pair[0])?;
         let low = hex_nibble(flag_name, pair[1])?;
         digest[index] = (high << 4) | low;