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📝 WalkthroughWalkthroughThe bridge captures BAML logs during native SDK calls, filters them by severity, drains them during and after execution, and writes them to stderr. Configuration uses ChangesSDK logging
Estimated code review effort: 4 (Complex) | ~45 minutes Sequence Diagram(s)sequenceDiagram
participant SDKCaller
participant bridge_cffi
participant sdk_logs
participant bex_engine
SDKCaller->>bridge_cffi: invoke BAML call
bridge_cffi->>sdk_logs: configure call context
bridge_cffi->>bex_engine: execute wrapped engine call
sdk_logs->>bex_engine: drain captured logs
sdk_logs-->>SDKCaller: write rendered logs to stderr
bridge_cffi-->>SDKCaller: return encoded result
Suggested reviewers: Merge Risk: 🟡 Moderate · up to When BAML_LOG is unset, native SDK calls can currently write BAML logs to stderr by default, which may unexpectedly pollute application output; merge should wait for the opt-in behavior to be corrected. The cancellation test also remains vulnerable to intermittent failures under load. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
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Inline comments:
In `@baml_language/crates/bex_engine/src/value_capture.rs`:
- Around line 121-129: The from_baml_log parser should map an unset BAML_LOG
value (raw == None) to TraceLogLevel::Off so capture is disabled by default.
Preserve the existing mappings for configured values, and update the downstream
parser test covering None to expect Off instead of Info.
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📒 Files selected for processing (10)
baml_language/crates/baml_cli/src/test_command.rsbaml_language/crates/bex_engine/src/lib.rsbaml_language/crates/bex_engine/src/value_capture.rsbaml_language/crates/bex_project/src/lib.rsbaml_language/crates/bridge_cffi/Cargo.tomlbaml_language/crates/bridge_cffi/src/baml_to_host.rsbaml_language/crates/bridge_cffi/src/lib.rsbaml_language/crates/bridge_cffi/src/sdk_logs.rsbaml_language/sdk_tests/crates/python_pydantic2/function_calls/customizable/test_main.pybaml_language/sdk_tests/fixtures/function_calls/baml_src/main.baml
🚧 Files skipped from review as they are similar to previous changes (7)
- baml_language/crates/bridge_cffi/Cargo.toml
- baml_language/crates/bridge_cffi/src/lib.rs
- baml_language/crates/bex_project/src/lib.rs
- baml_language/sdk_tests/fixtures/function_calls/baml_src/main.baml
- baml_language/crates/bex_engine/src/lib.rs
- baml_language/crates/bridge_cffi/src/baml_to_host.rs
- baml_language/crates/bridge_cffi/src/sdk_logs.rs
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## Summary
- default `baml run` and `baml test` structured logging to `info` when
neither `--log` nor `BAML_LOG` is set
- preserve explicit `--log`/`BAML_LOG` overrides, including `--log off`
- keep debug output filtered at the default threshold and flush visible
logs before results or test reports
## Reproduction
On `canary`, `baml run -e 'log.info("visible"); 7'` and a `baml test`
containing `log.info("visible")` print only their result/report because
both log thresholds default to `off`. This is the visibility half of the
reported failure: a detached agent/stream panic could leave the session
in thinking while the default-off runner exposed no contemporaneous
info-level diagnostics.
After this change, unset `run` and `test` invocations print
info/warn/error lines while filtering debug; `--log off` remains fully
quiet. The independent `Runtime$stream` schema-aligned parsing panic is
intentionally not changed here.
## Pack and bridge overlap
Packed-runtime log delivery is not present on `canary`; open PR BoundaryML#4514
owns that plumbing, so this PR does not duplicate it. BoundaryML#4514 currently
defaults an unset `BAML_LOG` to `off`; the requested packed-runtime
default belongs there once that delivery path lands.
The Rust SDK library loader separately reads `BAML_LOG` once and already
defaults unset or invalid values to `info`. User-authored `log.*`
delivery through native SDK function-call bridges is owned by BoundaryML#4412
(superseding BoundaryML#4345); that proposed bridge path reads `BAML_LOG` per call
and currently treats unset/empty/off as `off`.
## Tests
- `cargo +1.93.0 test --manifest-path baml_language/Cargo.toml -p
baml_cli --lib` (446 passed)
- `cargo +1.93.0 test --manifest-path baml_language/Cargo.toml -p
baml_cli --test exit_code_e2e
test_log_sources_route_filtered_baml_logs_to_stdout_without_changing_exit_codes
-- --exact`
- `cargo +1.93.0 clippy --manifest-path baml_language/Cargo.toml -p
baml_cli --all-targets -- -D warnings`
- `cargo +1.93.0 fmt --manifest-path baml_language/Cargo.toml --all --
--check`
Fixes
[B-1755](https://linear.app/boundaryml2/issue/B-1755/set-the-default-log-level-to-info)
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* `baml run` and `baml test` now display Info-level logs by default.
* Use `--log` or the `BAML_LOG` environment variable to adjust the
logging threshold, including disabling logs.
* **Documentation**
* Updated command help and documentation to clarify the default
Info-level logging behavior and available overrides.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Summary
baml_exec::LogOutput; preserve CLI precedence of--log, thenBAML_LOG, theninfo(from merged fix(cli): default baml run and test logging to info #4930)log.*events to stderr as[BAML LEVEL] ...Root cause
The engine only records
$baml_logevents when a call boundary supplies enabled capture defaults and aTraceCaptureProducer. SDK bridges built theirFunctionCallContextwithout either, so authored BAML log events were discarded before they could reach the host.Stack and integration
Stack:
canary→ #4514 (packed/file logging) → #4412 (SDK bridge logging). Merge #4514 first.The shared
baml_exec::LogOutputand native SDK bridges use the engine'sTraceLogLevelfilter. Capture admits all levels needed by either the terminal or file sink, so--log off --log-file <PATH>still captures every level without terminal output. The filter remains available when building shared execution helpers for WebAssembly. Unset or emptyBAML_LOGremainsOFFfor SDK calls.Fixes B-1172.
Validation
Validated the combined stack after rebasing onto #4514 and merged #4930:
cargo fmt --all -- --checkcargo test -p baml_exec -p baml_cli -p bridge_cffi --lib(546 passed)cargo test -p baml_cli --test exit_code_e2e log_(3 passed)cargo test -p baml_cli --test pack_e2e pack_e2e_baml_log_env_surfaces_filtered_logs -- --exact(passed)cargo check --target wasm32-unknown-unknown -p baml_execcargo clippy -p baml_exec -p bex_engine -p bridge_cffi --all-targets -- -D warnings