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feat(context): bound per-tool output before it enters agent history

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Cap the size of every tool result so a single verbose command (recursive
find, noisy scanner, full page dump) can't pin the conversation near the
model's context window for the rest of a scan.

- New ContextSettings config group with env-tunable caps.
- Default the SDK shell tools' max_output_tokens so exec_command /
  write_stdin truncate head+tail instead of returning unbounded output.
- Bound Strix's own FunctionTool/CustomTool results (line + UTF-8 byte
  head+tail preview with a truncation notice) and cap error strings.
This commit is contained in:
Ahmed Allam
2026-07-26 14:38:12 -07:00
committed by Ahmed Allam
parent d2fbcb726d
commit a70a87f272
6 changed files with 214 additions and 11 deletions
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strix/config/settings.py
+18
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@@ -55,6 +55,23 @@ class DedupeSettings(BaseSettings):
api_base: str | None = Field(default=None, alias="DEDUPE_LLM_API_BASE")
class ContextSettings(BaseSettings):
"""Context-window management: per-tool-output caps and history compaction."""
model_config = _BASE_CONFIG
auto_compact: bool = Field(default=True, alias="STRIX_CONTEXT_AUTO_COMPACT")
compact_buffer_tokens: int = Field(default=20_000, gt=0, alias="STRIX_CONTEXT_BUFFER_TOKENS")
keep_tokens: int = Field(default=8_000, gt=0, alias="STRIX_CONTEXT_KEEP_TOKENS")
fallback_context_tokens: int = Field(
default=200_000, gt=0, alias="STRIX_CONTEXT_FALLBACK_TOKENS"
)
summary_max_tokens: int = Field(default=4_096, gt=0, alias="STRIX_CONTEXT_SUMMARY_TOKENS")
tool_output_max_tokens: int = Field(default=8_000, gt=0, alias="STRIX_TOOL_OUTPUT_MAX_TOKENS")
tool_output_max_lines: int = Field(default=2_000, gt=0, alias="STRIX_TOOL_OUTPUT_MAX_LINES")
tool_output_max_bytes: int = Field(default=50 * 1024, gt=0, alias="STRIX_TOOL_OUTPUT_MAX_BYTES")
class RuntimeSettings(BaseSettings):
model_config = _BASE_CONFIG
@@ -99,6 +116,7 @@ class Settings(BaseSettings):
llm: LlmSettings = Field(default_factory=LlmSettings)
dedupe: DedupeSettings = Field(default_factory=DedupeSettings)
runtime: RuntimeSettings = Field(default_factory=RuntimeSettings)
context: ContextSettings = Field(default_factory=ContextSettings)
telemetry: TelemetrySettings = Field(default_factory=TelemetrySettings)
integrations: IntegrationSettings = Field(default_factory=IntegrationSettings)
viewer: ViewerSettings = Field(default_factory=ViewerSettings)