fix(agent): resolve context_length for plugin context engines - #9238
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Plugin context engines loaded via load_context_engine() were never given context_length, causing the CLI status bar to show "ctx --" with an empty progress bar. Call update_model() immediately after loading the plugin engine, mirroring what switch_model() already does. Fixes #9071 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Verify that plugin context engines receive update_model() with correct context_length during AIAgent init — regression test for the ctx -- bug.
This was referenced Apr 13, 2026
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Summary
Salvage of PR #9218 by @stephenschoettler. Also addresses #9117 by @corazzione (duplicate fix, submitted first).
Plugin context engines (like LCM) were never initialized with
context_lengthduring agent startup. The built-inContextCompressorresolves it in its__init__, but the plugin path just assigned the engine directly — leavingcontext_lengthat the ABC default of 0. This caused the CLI status bar to permanently showctx --with an empty progress bar.The fix calls
update_model()on the plugin engine immediately after loading, mirroring whatswitch_model()already does.Changes
run_agent.py: Callget_model_context_length()+update_model()after assigning plugin engine (cherry-picked from fix(agent): resolve context_length for plugin context engines #9218)tests/run_agent/test_plugin_context_engine_init.py: Regression tests verifying plugin engines get correctcontext_lengthandupdate_model()argsTest plan
49 passed.
Fixes #9071
Closes #9218
Closes #9117