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feat: expose HERMES_SESSION_ID to agent tools via ContextVar + env (#23847)

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Set HERMES_SESSION_ID using the existing session_context.py ContextVar
system for concurrency safety (multiple gateway sessions in one process
won't cross-talk). Also writes os.environ as fallback for CLI mode.

Touchpoints:
- gateway/session_context.py: Add _SESSION_ID ContextVar + _VAR_MAP entry
- run_agent.py: Set both ContextVar and os.environ at init and on
  context-compression rotation
- tools/environments/local.py: Bridge ContextVars into subprocess env
  in _make_run_env() (ContextVars don't propagate to child processes)
- tests/run_agent/test_session_id_env.py: 3 tests covering env, provided
  ID, and ContextVar paths

execute_code subprocess already passes HERMES_* prefixed vars through
_scrub_child_env (line 82: _SAFE_ENV_PREFIXES includes 'HERMES_').

Primary use case: webhook-triggered agents that need to include a
`--resume <session_id>` takeover command in their output.
This commit is contained in:
Siddharth Balyan 2026-05-12 00:16:45 +05:30 • committed by GitHub
parent ce0f529cde
commit 271883447e
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4 changed files with 94 additions and 1 deletions
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2
gateway/session_context.py
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@ -55,6 +55,7 @@ _SESSION_THREAD_ID: ContextVar = ContextVar("HERMES_SESSION_THREAD_ID", default=
_SESSION_USER_ID: ContextVar = ContextVar("HERMES_SESSION_USER_ID", default=_UNSET)
_SESSION_USER_NAME: ContextVar = ContextVar("HERMES_SESSION_USER_NAME", default=_UNSET)
_SESSION_KEY: ContextVar = ContextVar("HERMES_SESSION_KEY", default=_UNSET)
_SESSION_ID: ContextVar = ContextVar("HERMES_SESSION_ID", default=_UNSET)
# Cron auto-delivery vars — set per-job in run_job() so concurrent jobs
# don't clobber each other's delivery targets.
@ -70,6 +71,7 @@ _VAR_MAP = {
"HERMES_SESSION_USER_ID": _SESSION_USER_ID,
"HERMES_SESSION_USER_NAME": _SESSION_USER_NAME,
"HERMES_SESSION_KEY": _SESSION_KEY,
"HERMES_SESSION_ID": _SESSION_ID,
"HERMES_CRON_AUTO_DELIVER_PLATFORM": _CRON_AUTO_DELIVER_PLATFORM,
"HERMES_CRON_AUTO_DELIVER_CHAT_ID": _CRON_AUTO_DELIVER_CHAT_ID,
"HERMES_CRON_AUTO_DELIVER_THREAD_ID": _CRON_AUTO_DELIVER_THREAD_ID,