diff --git a/docs/workstreams.md b/docs/workstreams.md
index 7665850..d74f403 100644
--- a/docs/workstreams.md
+++ b/docs/workstreams.md
@@ -87,11 +87,12 @@ Codex handles the request only under an existing acceptance-criteria task with m
 
 ## Delivery waves
 
-1. Codex completes OAuth core, TASK-004 API foundations, and TASK-005 repository/ref selection.
-2. After TASK-005's reviewed contract commit, Claude builds TASK-006 in a separate worktree while Codex builds TASK-009 history/diff contracts.
-3. After both are reviewed, Claude builds TASK-007 while Codex builds TASK-010 work-item contracts and integrates TASK-006.
-4. After TASK-010's reviewed contract commit, Claude builds TASK-008 while Codex verifies merged history/navigation behavior.
-5. Codex performs final integration and all repository-wide gates.
+1. Claude may immediately build TASK-006A from freeze commit `0929282` while Codex builds TASK-002A and TASK-002B.
+2. Codex completes TASK-004 API foundations and TASK-005 repository/ref selection; TASK-006A is reviewed and integrated independently.
+3. After TASK-005's reviewed contract commit, Claude builds the remaining TASK-006 UI in a separate worktree while Codex builds TASK-009 history/diff contracts.
+4. After both are reviewed, Claude builds TASK-007 while Codex builds TASK-010 work-item contracts and integrates TASK-006.
+5. After TASK-010's reviewed contract commit, Claude builds TASK-008 while Codex verifies merged history/navigation behavior.
+6. Codex performs final integration and all repository-wide gates.
 
 ## Cross-review
 
diff --git a/prompts/claude-task-006a.md b/prompts/claude-task-006a.md
new file mode 100644
index 0000000..0c71675
--- /dev/null
+++ b/prompts/claude-task-006a.md
@@ -0,0 +1,18 @@
+# Claude kickoff: TASK-006A
+
+Work only on TASK-006A in a separate worktree and a `claude/` branch created from the Codex assignment commit containing this prompt. The shared domain contract is frozen at commit `0929282`; verify that the relevant domain files have not changed since that commit.
+
+Read completely, in order:
+
+1. `AGENTS.md`
+2. `CLAUDE.md`
+3. `docs/product.md`
+4. `docs/architecture.md`
+5. `docs/collaboration.md`
+6. `docs/workstreams.md`
+7. `tasks/003-repository-browser-foundation.md`
+8. `tasks/006a-code-content-classifier.md`
+
+You are the implementer for this task and Codex is the reviewer. Your only writable paths are the three paths listed in TASK-006A. Do not edit Gradle, domain, data, Android resources, manifests, navigation, other tasks, or other feature packages.
+
+Implement the smallest pure Kotlin classifier satisfying every acceptance criterion. Run all required checks, inspect the actual diff, update only TASK-006A evidence/review sections, commit on a `claude/` branch, and hand off the exact commit to Codex. If the frozen contracts are insufficient, stop and submit the structured shared-contract request from `docs/workstreams.md`; do not modify shared files.
diff --git a/tasks/006-code-browser.md b/tasks/006-code-browser.md
index 7d71578..2b426c3 100644
--- a/tasks/006-code-browser.md
+++ b/tasks/006-code-browser.md
@@ -1,6 +1,6 @@
 # TASK-006: Browse trees and source code by ref
 
-Status: planned — depends on TASK-005
+Status: planned — depends on TASK-005 and TASK-006A
 Owner: Claude
 Reviewer: Codex
 
diff --git a/tasks/006a-code-content-classifier.md b/tasks/006a-code-content-classifier.md
new file mode 100644
index 0000000..4e43c81
--- /dev/null
+++ b/tasks/006a-code-content-classifier.md
@@ -0,0 +1,57 @@
+# TASK-006A: Classify source content safely
+
+Status: ready — shared domain contract frozen at commit `0929282`
+Owner: Claude
+Reviewer: Codex
+
+## Outcome
+
+Classify already-loaded repository content into bounded text, binary, Git LFS pointer, unsupported encoding, or oversized states so the future code viewer never blindly decodes or renders arbitrary bytes.
+
+## Contract freeze
+
+- Shared domain contract commit: `0929282`.
+- Claude starts from the later Codex assignment commit that adds this task and prompt; no shared domain file may differ from `0929282` without an approved contract change.
+- Input contracts: `SourceContent`, `SourceFile`, `RepositoryPath`, and `RepositoryRef` from TASK-003.
+- This task must not change the frozen domain contracts. Required changes use the request format in `docs/workstreams.md`.
+
+## Writable paths
+
+- `app/src/main/java/com/ubisam/ubgitea/feature/codebrowser/content/`
+- `app/src/test/java/com/ubisam/ubgitea/feature/codebrowser/content/`
+- `tasks/006a-code-content-classifier.md` evidence and review sections only
+
+## Acceptance criteria
+
+- [ ] Classification results are immutable and distinguish text, binary, Git LFS pointer, unsupported encoding, and oversized content.
+- [ ] Maximum input bytes, rendered characters, and rendered lines are constructor-injected positive limits.
+- [ ] Oversized input is rejected before text decoding and exposes only safe metadata, not decoded content.
+- [ ] Binary detection includes NUL bytes and does not convert arbitrary bytes to replacement characters.
+- [ ] Text decoding uses a strict UTF-8 decoder that reports malformed or unmappable input.
+- [ ] A Git LFS pointer is recognized only from its canonical version line and required object ID/size fields within configured bounds.
+- [ ] Rendered text is explicitly marked truncated when character or line limits are exceeded.
+- [ ] No Android, network, persistence, token, logging, or write-operation dependency appears in the package.
+- [ ] Tests cover empty/ASCII/Korean text, CRLF, malformed UTF-8, NUL/binary, valid and malformed LFS pointers, exact/over byte limits, line limits, character limits, and defensive immutability.
+
+## Security and privacy
+
+- Test fixtures must contain only synthetic public content.
+- Classification errors must not include source content in messages.
+- The classifier does not persist content or place it on the clipboard.
+
+## Required checks
+
+```text
+./gradlew assembleDebug
+./gradlew testDebugUnitTest
+./gradlew lintDebug
+./gradlew testDebugUnitTest --tests "com.ubisam.ubgitea.feature.codebrowser.content.*"
+```
+
+## Handoff
+
+Claude must provide the exact branch/commit, changed paths, acceptance-criteria evidence, check results, open findings, and a request for Codex review. No integration or shared-file edit is authorized by this task.
+
+## Evidence
+
+Pending Claude implementation.