diff --git a/CHANGELOG.md b/CHANGELOG.md
index 218634862..53cba72a6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -50,6 +50,7 @@ Docs: https://docs.openclaw.ai
 - Security/Web tools SSRF guard: keep DNS pinning for untrusted `web_fetch` and citation-redirect URL checks when proxy env vars are set, and require explicit dangerous opt-in before env-proxy routing can bypass pinned dispatch for trusted/operator-controlled endpoints. Thanks @tdjackey for reporting.
 - Gateway/Security canonicalization hardening: decode plugin route path variants to canonical fixpoint (with bounded depth), fail closed on canonicalization anomalies, and enforce gateway auth for deeply encoded `/api/channels/*` variants to prevent alternate-path auth bypass through plugin handlers. Thanks @tdjackey for reporting.
 - Agents/Sessions list transcript paths: handle missing/non-string/relative `sessions.list.path` values and per-agent `{agentId}` templates when deriving `transcriptPath`, so cross-agent session listings resolve to concrete agent session files instead of workspace-relative paths. (#24775) Thanks @martinfrancois.
+- Agents/Subagents `sessions_spawn`: reject malformed `agentId` inputs before normalization (for example error-message/path-like strings) to prevent unintended synthetic agent IDs and ghost workspace/session paths; includes strict validation regression coverage. (#31381) Thanks @openperf.
 - macOS/PeekabooBridge: add compatibility socket symlinks for legacy `clawdbot`, `clawdis`, and `moltbot` Application Support socket paths so pre-rename clients can still connect. (#6033) Thanks @lumpinif and @vincentkoc.
 - Webchat/Feishu session continuation: preserve routable `OriginatingChannel`/`OriginatingTo` metadata from session delivery context in `chat.send`, and prefer provider-normalized channel when deciding cross-channel route dispatch so Webchat replies continue on the selected Feishu session instead of falling back to main/internal session routing. (#31573)
 - Feishu/Duplicate replies: suppress same-target reply dispatch when message-tool sends use generic provider metadata (`provider: "message"`) and normalize `lark`/`feishu` provider aliases during duplicate-target checks, preventing double-delivery in Feishu sessions. (#31526)