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3128d9fcd2
Pass 3 of `_prune_old_tool_results` previously shrunk long `function.arguments`
blobs by slicing the raw JSON string at byte 200 and appending the literal
text `...[truncated]`. That routinely produced payloads like::
{"path": "/foo.md", "content": "# Long markdown
...[truncated]
— an unterminated string with no closing brace. Strict providers (observed
on MiniMax) reject this as `invalid function arguments json string` with a
non-retryable 400. Because the broken call survives in the session history,
every subsequent turn re-sends the same malformed payload and gets the same
400, locking the session into a re-send loop until the call falls out of
the window.
Fix: parse the arguments first, shrink long string leaves inside the parsed
structure, and re-serialise. Non-string values (paths, ints, booleans, lists)
pass through intact. Arguments that are not valid JSON to begin with (rare,
some backends use non-JSON tool args) are returned unchanged rather than
replaced with something neither we nor the provider can parse.
Observed in the wild: a `write_file` with ~800 chars of markdown `content`
triggered this on a real session against MiniMax-M2.7; every turn after
compression got rejected until the session was manually reset.
Tests:
- 7 direct tests of `_truncate_tool_call_args_json` covering valid-JSON
output, non-JSON pass-through, nested structures, non-string leaves,
scalar JSON, and Unicode preservation
- 1 end-to-end test through `_prune_old_tool_results` Pass 3 that
reproduces the exact failure payload shape from the incident
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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| .. | ||
| acp | ||
| agent | ||
| cli | ||
| cron | ||
| e2e | ||
| environments/benchmarks | ||
| fakes | ||
| gateway | ||
| hermes_cli | ||
| honcho_plugin | ||
| integration | ||
| plugins | ||
| run_agent | ||
| skills | ||
| tools | ||
| tui_gateway | ||
| __init__.py | ||
| conftest.py | ||
| run_interrupt_test.py | ||
| test_batch_runner_checkpoint.py | ||
| test_cli_file_drop.py | ||
| test_cli_skin_integration.py | ||
| test_ctx_halving_fix.py | ||
| test_empty_model_fallback.py | ||
| test_evidence_store.py | ||
| test_hermes_constants.py | ||
| test_hermes_logging.py | ||
| test_hermes_state.py | ||
| test_honcho_client_config.py | ||
| test_ipv4_preference.py | ||
| test_mcp_serve.py | ||
| test_mini_swe_runner.py | ||
| test_minisweagent_path.py | ||
| test_model_picker_scroll.py | ||
| test_model_tools.py | ||
| test_model_tools_async_bridge.py | ||
| test_ollama_num_ctx.py | ||
| test_packaging_metadata.py | ||
| test_plugin_skills.py | ||
| test_project_metadata.py | ||
| test_retry_utils.py | ||
| test_sql_injection.py | ||
| test_subprocess_home_isolation.py | ||
| test_timezone.py | ||
| test_toolset_distributions.py | ||
| test_toolsets.py | ||
| test_trajectory_compressor.py | ||
| test_trajectory_compressor_async.py | ||
| test_tui_gateway_server.py | ||
| test_utils_truthy_values.py | ||