diff --git a/docs/development-log.md b/docs/development-log.md
index 4d8db36..7975d41 100644
--- a/docs/development-log.md
+++ b/docs/development-log.md
@@ -28,8 +28,15 @@ This is the append-only implementation and handoff record shared by Codex and Cl
 - Next recommended task: OAuth protocol core followed by Android OAuth integration.
 - Next owner: Codex.
 
-## Current ownership
+## 2026-08-25 — TASK-002A
 
-- Active task: TASK-002A OAuth protocol core
-- Current writer: Codex
-- Claude status: waiting; TASK-006A is queued until an explicit handoff is appended.
+- Agent and role: Codex, implementer and integrator
+- Commit/diff: `6da016c`
+- Features implemented: OAuth client configuration, approved read-only scopes, fresh PKCE S256 verifier/state generation, authorization URL construction, exact redirect validation, transaction expiry, denial/success modeling, and strict callback query validation.
+- How it was implemented: Pure Kotlin/JDK code with `SecureRandom`, SHA-256, unpadded Base64 URL encoding, RFC 7636 verifier grammar, deterministic query component encoding, constant-time state comparison, strict UTF-8 percent decoding, duplicate/ambiguous response rejection, saturating time boundaries, and redacted string representations for sensitive values.
+- Files changed: `core/auth/protocol/`, matching protocol tests, ADR-002, TASK-002 umbrella, TASK-002A, and TASK-002B.
+- Checks and results: Focused OAuth tests 21/21 passed; full unit tests 43/43 passed; debug APK build passed; Android lint passed; diff check passed; sensitive-pattern scan found no assigned secret/token/password/private key.
+- Review findings and resolutions: P2 verifier grammar fixed with strict RFC character/length validation; P2 parameter pollution and malformed UTF-8 fixed with fail-closed parsing; P3 timestamp overflow fixed with saturating boundaries. Independent re-review found no remaining P0-P3 findings.
+- Known limitations: System browser launch, App Link dispatch, code exchange, Keystore token vault, user identity, and real-server E2E are intentionally deferred to TASK-002B. E2E remains blocked by signing fingerprints and hosted `assetlinks.json`.
+- Next recommended task: TASK-002B Android OAuth integration, completing locally testable browser/storage/exchange boundaries before the external E2E gate.
+- Next owner: Codex.