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fix(tui_gateway): clamp -1 post-compression sentinel in context_used

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The salvaged fix guards with `if ctx_max and last_prompt`, but last_prompt
comes from `last_prompt_tokens or 0` — the post-compression -1 sentinel
(conversation_compression) is truthy, so it leaked context_used=-1 on the
transitional turn. Clamp <0 to 0 so it reads as unknown (no gauge), matching
the CLI status-bar path (cli.py _get_status_bar_snapshot).

Follow-up on the salvaged #50518 (r266-tech).
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kshitijk4poor 2026-07-01 12:58:51 +05:30 • committed by kshitij
parent 83b7c52ece
commit b6d8fc41c8
2 changed files with 25 additions and 0 deletions
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19
tests/test_tui_gateway_server.py
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@ -8513,3 +8513,22 @@ def test_get_usage_reports_real_current_occupancy():
assert usage["context_used"] == 60_000
assert usage["context_max"] == 120_000
assert usage["context_percent"] == 50
def test_get_usage_clamps_post_compression_sentinel():
"""Right after a compression, last_prompt_tokens is the -1 sentinel
(conversation_compression sets it until the next real usage report). It is
truthy, so `or 0` doesn't neutralize it — the guard must clamp <0 to 0 so
the transitional turn emits no gauge instead of leaking context_used=-1."""
agent = types.SimpleNamespace(
model="test-model",
session_total_tokens=4_000_000,
context_compressor=types.SimpleNamespace(
last_prompt_tokens=-1,
context_length=1_048_576,
compression_count=6,
),
)
usage = server._get_usage(agent)
assert "context_used" not in usage
assert "context_percent" not in usage