SendMessage tool unavailable in Claude Code CLI — subagent context cannot be preserved between calls

[AShchurEP]

Description

When using the Agent tool to spawn subagents in Claude Code CLI, the documentation states that SendMessage should be available to continue a previously spawned agent with its context preserved. However, SendMessage does not appear in the available tools list, making it impossible to resume an existing subagent. Each Agent call starts a fresh agent with no memory of prior interactions.

Additionally, the debug logs show repeated errors on subagent stop:

[ERROR] [hook:SubagentStop] Processor metrics: Session metadata not found - session must be created before processing
[ERROR] [hook:SubagentStop] Processor conversations: Session metadata not found - session must be created before processing
[WARN] [sso-session-sync] Sync had failures: Session not found

This suggests subagent sessions are not being registered properly in the session store.

Steps to Reproduce

1. Start Claude Code CLI (claude)
2. Ask Claude to spawn a subagent via the Agent tool
3. Attempt to continue the same agent by referencing its agentId from the response
4. Claude reports that SendMessage is not available in its tool list and spawns a new agent instead

Expected Behavior

SendMessage is available as a tool so Claude can resume the subagent with full context preserved (as documented in the Agent tool description).

Actual Behavior

SendMessage is absent from the available tools list. Every follow-up spawns a new agent without context. Subagent stop hooks log Session metadata not found errors.

Environment

Field	Value
OS	Windows 11 Enterprise 10.0.26100
Node.js	v24.13.0
npm	11.6.2
CodeMie CLI	0.3.2
CodeMie Code agent	0.0.47
Claude Code	installed via npm
Shell	bash (Git Bash)
Model	claude-sonnet-4-6
CodeMie URL	https://codemie.lab.epam.com

Installed Agents

• CodeMie Code (0.0.47)
• Claude Code (installed via npm — deprecated)

CodeMie Doctor Output

Full doctor output

Node.js: v24.13.0 ✓
npm: 11.6.2 ✓
Python: 3.14.2 ✓
uv: not found (optional)
AWS CLI: not found (optional)
Active Profile: default
Provider: ai-run-sso
CodeMie URL: https://codemie.lab.epam.com
API Key: proxy-ha***dled
Model: claude-sonnet-4-6
SSO: operational, session expires in 19 hours
CodeMie Code: 0.0.47 ✓
Claude Code: installed via npm (deprecated)
Git: gitlab remote detected

Recent Errors from Logs

ERROR and WARN entries from recent logs (~/.codemie/logs/)

[hook:SubagentStop] Processor metrics: Session metadata not found - session must be created before processing
[hook:SubagentStop] Processor conversations: Session metadata not found - session must be created before processing
[sso-session-sync] Sync had failures: Session not found
[SessionStore] Cannot start activity tracking - session not found

These errors repeat for every subagent invocation (session ID: 7aa20179-728e-492c-8c1c-a428416ca2a6).
Full logs available at: ~/.codemie/logs/debug-2026-08-20.log and debug-2026-08-19.log