[chenghao-mou]

#7958 renamed _shorten_call_id to _shorten_id in openai_utils, but the thunderphone plugin and its tests still import the old name. The import fails, so type-check and unit-tests fail on main and on every PR that merges with it.

The behavior is unchanged: _shorten_id keeps the same 32-char cap and SHA-256 fallback, so thunderphone's call-id mapping still matches.

Initial prompt and agent context

Model: Claude Opus 5.5

Open a small draft fix PR against livekit/agents main. Main is broken right now.

What broke: #7958 ("fix(realtime): keep item ids within OpenAI's 32-char limit", commit 0737686, merged 2026-10-28 21:42 UTC) renamed _shorten_call_id to _shorten_id in livekit-agents/livekit/agents/llm/_realtime/openai_utils.py. It did not update the thunderphone plugin, which still imports the old name:

• livekit-plugins/livekit-plugins-thunderphone/livekit/plugins/thunderphone/realtime/realtime_model.py:49: from livekit.agents.llm._realtime.openai_utils import _shorten_call_id
• the same file, line 425: self._tp_call_ids[_shorten_call_id(call_id)] = call_id

Effect: main's own tests run for #7958 failed. type-check (3.10), type-check (3.13) and unit-tests fail with Module "livekit.agents.llm._realtime.openai_utils" has no attribute "_shorten_call_id" and ImportError while importing test module tests/test_plugin_thunderphone_realtime.py. Every open PR that merges with main fails the same way, for example #6202.

Task:

1. Read the repo's AGENTS.md / CLAUDE.md first.
2. Check that _shorten_id does the same thing for thunderphone's call ids as the old _shorten_call_id did (read fix(realtime): keep item ids within OpenAI's 32-char limit #7958's diff). If the semantics changed (for example, a different id format or length), say so before you change anything.
3. Update the thunderphone plugin to use _shorten_id. Check the whole repo for any other _shorten_call_id reference.
4. Run the thunderphone tests (tests/test_plugin_thunderphone_realtime.py), ruff, and the repo type check for that plugin.
5. Commit, push, and open a draft PR with the pr-desc skill. Title like fix(thunderphone): use _shorten_id after the openai_utils rename. Reference fix(realtime): keep item ids within OpenAI's 32-char limit #7958 as the cause. This is a small fix with no Linear ticket. Apply the review-effort label per pr-desc (likely review_effort:low).
6. Do not comment on fix(realtime): keep item ids within OpenAI's 32-char limit #7958 or any other PR, and do not request reviewers.

Report the PR link, the head SHA, and the check results.

Follow-up: "make sure there is no PR for this already"

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.