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fix: surface experiment-comparison2 fetch failures and retry transient 5xx - #640

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fix: surface experiment-comparison2 fetch failures and retry transient 5xx#640
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praneethy91:fix/experiment-summarize-scores-fetch-error

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@praneethy91Praneeth Yenugutala (praneethy91) commented Jul 30, 2026

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Summary

Fixes#639.

Experiment.summarize() caught any exception from the experiment-comparison2 fetch and silently fell back to an empty {} summary, making a transient fetch failure indistinguishable from an experiment that genuinely has no scores. Meanwhile, RetryRequestExceptionsAdapter only retried on connection-level exceptions (timeouts, connection resets), so a request that completed with a non-2xx status (e.g. a 502 from a proxy hiccup) never entered the retry path at all — it went straight to raise_for_status() and got swallowed by summarize().

  • RetryRequestExceptionsAdapter.send() now also retries when a completed response has a transient status code (429/500/502/503/504), using the same exponential backoff as the existing exception-based retry path. This should eliminate most one-off 5xx blips before they ever reach summarize().
  • ExperimentSummary gains a new scores_fetch_error: str | None field, populated whenever the experiment-comparison2 fetch fails after retries are exhausted. scores/metrics still default to {} for backwards compatibility, but callers building automation (e.g. CI gates) on summary.scores can now check scores_fetch_error to tell "fetch failed" apart from "no scores." The printed str(summary) also surfaces a WARNING line when this happens.

Test plan

  • py/src/braintrust/test_http.py::TestRetryOnHttpErrorStatus — new tests covering retry-on-502, giving up after base_num_retries, and not retrying non-retryable statuses (404), using a real local HTTP server (no mocks), consistent with existing adapter tests in this file.
  • py/src/braintrust/test_framework.py::test_experiment_summarize_surfaces_scores_fetch_error — new test asserting summarize() populates scores_fetch_error (and the printed summary contains a WARNING) when the comparison fetch raises.
  • cd py && uv run nox -s test_core — full core suite passes (614 passed, 63 skipped, 12 xfailed).
  • cd py && uv run nox -s pylint — clean.
  • cd py && uv run pre-commit run --files ... on changed files — clean.

Praneeth Yenugutala
fix: surface experiment-comparison2 fetch failures and retry transien…
93cc7ca
…t 5xx
Experiment.summarize() swallowed any exception from the experiment-comparison2
fetch into an empty {} summary, making a transient fetch failure indistinguishable
from an experiment that genuinely has no scores. Separately,
RetryRequestExceptionsAdapter only retried on connection-level exceptions, so a
completed non-2xx response (e.g. a 502 from a proxy hiccup) never entered the
retry path at all.
- RetryRequestExceptionsAdapter now retries responses with a transient status
(429/500/502/503/504) using the same backoff as connection-level failures.
- ExperimentSummary gains scores_fetch_error, populated when the
experiment-comparison2 fetch fails, so callers gating automation on
summary.scores can distinguish "fetch failed" from "no scores".
Fixesbraintrustdata#639
@AbhiPrasad

Abhijeet Prasad (AbhiPrasad) commented Aug 12, 2026

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will be fixed by #682, closing this PR as a result

@AbhiPrasadAbhijeet Prasad (AbhiPrasad) mentioned this pull request Aug 12, 2026
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Experiment.summarize() silently discards scores/metrics on any fetch failure instead of surfacing or retrying

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fix: surface experiment-comparison2 fetch failures and retry transient 5xx by praneethy91 · Pull Request #640 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
fix: surface experiment-comparison2 fetch failures and retry transient 5xx - #640
Closed
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
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praneethy91:fix/experiment-summarize-scores-fetch-error
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fix: surface experiment-comparison2 fetch failures and retry transient 5xx#640
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
braintrustdata:mainfrom 
praneethy91:fix/experiment-summarize-scores-fetch-error
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@praneethy91Praneeth Yenugutala (praneethy91)
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Jul 30, 2026

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Summary
Fixes#639.
Experiment.summarize() caught any exception from the experiment-comparison2 fetch and silently fell back to an empty {} summary, making a transient fetch failure indistinguishable from an experiment that genuinely has no scores. Meanwhile, RetryRequestExceptionsAdapter only retried on connection-level exceptions (timeouts, connection resets), so a request that completed with a non-2xx status (e.g. a 502 from a proxy hiccup) never entered the retry path at all — it went straight to raise_for_status() and got swallowed by summarize().
  • RetryRequestExceptionsAdapter.send() now also retries when a completed response has a transient status code (429/500/502/503/504), using the same exponential backoff as the existing exception-based retry path. This should eliminate most one-off 5xx blips before they ever reach summarize().
  • ExperimentSummary gains a new scores_fetch_error: str | None field, populated whenever the experiment-comparison2 fetch fails after retries are exhausted. scores/metrics still default to {} for backwards compatibility, but callers building automation (e.g. CI gates) on summary.scores can now check scores_fetch_error to tell "fetch failed" apart from "no scores." The printed str(summary) also surfaces a WARNING line when this happens.
Test plan
  • py/src/braintrust/test_http.py::TestRetryOnHttpErrorStatus — new tests covering retry-on-502, giving up after base_num_retries, and not retrying non-retryable statuses (404), using a real local HTTP server (no mocks), consistent with existing adapter tests in this file.
  • py/src/braintrust/test_framework.py::test_experiment_summarize_surfaces_scores_fetch_error — new test asserting summarize() populates scores_fetch_error (and the printed summary contains a WARNING) when the comparison fetch raises.
  • cd py && uv run nox -s test_core — full core suite passes (614 passed, 63 skipped, 12 xfailed).
  • cd py && uv run nox -s pylint — clean.
  • cd py && uv run pre-commit run --files ... on changed files — clean.
Praneeth Yenugutala
fix: surface experiment-comparison2 fetch failures and retry transien…
93cc7ca
…t 5xx
Experiment.summarize() swallowed any exception from the experiment-comparison2
fetch into an empty {} summary, making a transient fetch failure indistinguishable
from an experiment that genuinely has no scores. Separately,
RetryRequestExceptionsAdapter only retried on connection-level exceptions, so a
completed non-2xx response (e.g. a 502 from a proxy hiccup) never entered the
retry path at all.
- RetryRequestExceptionsAdapter now retries responses with a transient status
(429/500/502/503/504) using the same backoff as connection-level failures.
- ExperimentSummary gains scores_fetch_error, populated when the
experiment-comparison2 fetch fails, so callers gating automation on
summary.scores can distinguish "fetch failed" from "no scores".
Fixesbraintrustdata#639
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
commented
Aug 12, 2026

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will be fixed by #682, closing this PR as a result
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
mentioned this pull request
Aug 12, 2026
 Closed

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Experiment.summarize() silently discards scores/metrics on any fetch failure instead of surfacing or retrying


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fix: surface experiment-comparison2 fetch failures and retry transient 5xx by praneethy91 · Pull Request #640 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
fix: surface experiment-comparison2 fetch failures and retry transient 5xx - #640
Closed
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
braintrustdata:mainfrom 
praneethy91:fix/experiment-summarize-scores-fetch-error
Closed
fix: surface experiment-comparison2 fetch failures and retry transient 5xx#640
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
braintrustdata:mainfrom 
praneethy91:fix/experiment-summarize-scores-fetch-error
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@praneethy91
@praneethy91Praneeth Yenugutala (praneethy91)
commented
Jul 30, 2026

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Summary
Fixes#639.
Experiment.summarize() caught any exception from the experiment-comparison2 fetch and silently fell back to an empty {} summary, making a transient fetch failure indistinguishable from an experiment that genuinely has no scores. Meanwhile, RetryRequestExceptionsAdapter only retried on connection-level exceptions (timeouts, connection resets), so a request that completed with a non-2xx status (e.g. a 502 from a proxy hiccup) never entered the retry path at all — it went straight to raise_for_status() and got swallowed by summarize().
  • RetryRequestExceptionsAdapter.send() now also retries when a completed response has a transient status code (429/500/502/503/504), using the same exponential backoff as the existing exception-based retry path. This should eliminate most one-off 5xx blips before they ever reach summarize().
  • ExperimentSummary gains a new scores_fetch_error: str | None field, populated whenever the experiment-comparison2 fetch fails after retries are exhausted. scores/metrics still default to {} for backwards compatibility, but callers building automation (e.g. CI gates) on summary.scores can now check scores_fetch_error to tell "fetch failed" apart from "no scores." The printed str(summary) also surfaces a WARNING line when this happens.
Test plan
  • py/src/braintrust/test_http.py::TestRetryOnHttpErrorStatus — new tests covering retry-on-502, giving up after base_num_retries, and not retrying non-retryable statuses (404), using a real local HTTP server (no mocks), consistent with existing adapter tests in this file.
  • py/src/braintrust/test_framework.py::test_experiment_summarize_surfaces_scores_fetch_error — new test asserting summarize() populates scores_fetch_error (and the printed summary contains a WARNING) when the comparison fetch raises.
  • cd py && uv run nox -s test_core — full core suite passes (614 passed, 63 skipped, 12 xfailed).
  • cd py && uv run nox -s pylint — clean.
  • cd py && uv run pre-commit run --files ... on changed files — clean.
Praneeth Yenugutala
fix: surface experiment-comparison2 fetch failures and retry transien…
93cc7ca
…t 5xx
Experiment.summarize() swallowed any exception from the experiment-comparison2
fetch into an empty {} summary, making a transient fetch failure indistinguishable
from an experiment that genuinely has no scores. Separately,
RetryRequestExceptionsAdapter only retried on connection-level exceptions, so a
completed non-2xx response (e.g. a 502 from a proxy hiccup) never entered the
retry path at all.
- RetryRequestExceptionsAdapter now retries responses with a transient status
(429/500/502/503/504) using the same backoff as connection-level failures.
- ExperimentSummary gains scores_fetch_error, populated when the
experiment-comparison2 fetch fails, so callers gating automation on
summary.scores can distinguish "fetch failed" from "no scores".
Fixesbraintrustdata#639
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
commented
Aug 12, 2026

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will be fixed by #682, closing this PR as a result
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
mentioned this pull request
Aug 12, 2026
 Closed

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Experiment.summarize() silently discards scores/metrics on any fetch failure instead of surfacing or retrying


2 participants

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fix: surface experiment-comparison2 fetch failures and retry transient 5xx by praneethy91 · Pull Request #640 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
fix: surface experiment-comparison2 fetch failures and retry transient 5xx - #640
Closed
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
braintrustdata:mainfrom 
praneethy91:fix/experiment-summarize-scores-fetch-error
Closed
fix: surface experiment-comparison2 fetch failures and retry transient 5xx#640
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
braintrustdata:mainfrom 
praneethy91:fix/experiment-summarize-scores-fetch-error
Conversation
@praneethy91
@praneethy91Praneeth Yenugutala (praneethy91)
commented
Jul 30, 2026

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Summary
Fixes#639.
Experiment.summarize() caught any exception from the experiment-comparison2 fetch and silently fell back to an empty {} summary, making a transient fetch failure indistinguishable from an experiment that genuinely has no scores. Meanwhile, RetryRequestExceptionsAdapter only retried on connection-level exceptions (timeouts, connection resets), so a request that completed with a non-2xx status (e.g. a 502 from a proxy hiccup) never entered the retry path at all — it went straight to raise_for_status() and got swallowed by summarize().
  • RetryRequestExceptionsAdapter.send() now also retries when a completed response has a transient status code (429/500/502/503/504), using the same exponential backoff as the existing exception-based retry path. This should eliminate most one-off 5xx blips before they ever reach summarize().
  • ExperimentSummary gains a new scores_fetch_error: str | None field, populated whenever the experiment-comparison2 fetch fails after retries are exhausted. scores/metrics still default to {} for backwards compatibility, but callers building automation (e.g. CI gates) on summary.scores can now check scores_fetch_error to tell "fetch failed" apart from "no scores." The printed str(summary) also surfaces a WARNING line when this happens.
Test plan
  • py/src/braintrust/test_http.py::TestRetryOnHttpErrorStatus — new tests covering retry-on-502, giving up after base_num_retries, and not retrying non-retryable statuses (404), using a real local HTTP server (no mocks), consistent with existing adapter tests in this file.
  • py/src/braintrust/test_framework.py::test_experiment_summarize_surfaces_scores_fetch_error — new test asserting summarize() populates scores_fetch_error (and the printed summary contains a WARNING) when the comparison fetch raises.
  • cd py && uv run nox -s test_core — full core suite passes (614 passed, 63 skipped, 12 xfailed).
  • cd py && uv run nox -s pylint — clean.
  • cd py && uv run pre-commit run --files ... on changed files — clean.
Praneeth Yenugutala
fix: surface experiment-comparison2 fetch failures and retry transien…
93cc7ca
…t 5xx
Experiment.summarize() swallowed any exception from the experiment-comparison2
fetch into an empty {} summary, making a transient fetch failure indistinguishable
from an experiment that genuinely has no scores. Separately,
RetryRequestExceptionsAdapter only retried on connection-level exceptions, so a
completed non-2xx response (e.g. a 502 from a proxy hiccup) never entered the
retry path at all.
- RetryRequestExceptionsAdapter now retries responses with a transient status
(429/500/502/503/504) using the same backoff as connection-level failures.
- ExperimentSummary gains scores_fetch_error, populated when the
experiment-comparison2 fetch fails, so callers gating automation on
summary.scores can distinguish "fetch failed" from "no scores".
Fixesbraintrustdata#639
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
commented
Aug 12, 2026

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Member
will be fixed by #682, closing this PR as a result
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
mentioned this pull request
Aug 12, 2026
 Closed

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Experiment.summarize() silently discards scores/metrics on any fetch failure instead of surfacing or retrying


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fix: surface experiment-comparison2 fetch failures and retry transient 5xx by praneethy91 · Pull Request #640 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
fix: surface experiment-comparison2 fetch failures and retry transient 5xx - #640
Closed
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
braintrustdata:mainfrom 
praneethy91:fix/experiment-summarize-scores-fetch-error
Closed
fix: surface experiment-comparison2 fetch failures and retry transient 5xx#640
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
braintrustdata:mainfrom 
praneethy91:fix/experiment-summarize-scores-fetch-error
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@praneethy91
@praneethy91Praneeth Yenugutala (praneethy91)
commented
Jul 30, 2026

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Summary
Fixes#639.
Experiment.summarize() caught any exception from the experiment-comparison2 fetch and silently fell back to an empty {} summary, making a transient fetch failure indistinguishable from an experiment that genuinely has no scores. Meanwhile, RetryRequestExceptionsAdapter only retried on connection-level exceptions (timeouts, connection resets), so a request that completed with a non-2xx status (e.g. a 502 from a proxy hiccup) never entered the retry path at all — it went straight to raise_for_status() and got swallowed by summarize().
  • RetryRequestExceptionsAdapter.send() now also retries when a completed response has a transient status code (429/500/502/503/504), using the same exponential backoff as the existing exception-based retry path. This should eliminate most one-off 5xx blips before they ever reach summarize().
  • ExperimentSummary gains a new scores_fetch_error: str | None field, populated whenever the experiment-comparison2 fetch fails after retries are exhausted. scores/metrics still default to {} for backwards compatibility, but callers building automation (e.g. CI gates) on summary.scores can now check scores_fetch_error to tell "fetch failed" apart from "no scores." The printed str(summary) also surfaces a WARNING line when this happens.
Test plan
  • py/src/braintrust/test_http.py::TestRetryOnHttpErrorStatus — new tests covering retry-on-502, giving up after base_num_retries, and not retrying non-retryable statuses (404), using a real local HTTP server (no mocks), consistent with existing adapter tests in this file.
  • py/src/braintrust/test_framework.py::test_experiment_summarize_surfaces_scores_fetch_error — new test asserting summarize() populates scores_fetch_error (and the printed summary contains a WARNING) when the comparison fetch raises.
  • cd py && uv run nox -s test_core — full core suite passes (614 passed, 63 skipped, 12 xfailed).
  • cd py && uv run nox -s pylint — clean.
  • cd py && uv run pre-commit run --files ... on changed files — clean.
Praneeth Yenugutala
fix: surface experiment-comparison2 fetch failures and retry transien…
93cc7ca
…t 5xx
Experiment.summarize() swallowed any exception from the experiment-comparison2
fetch into an empty {} summary, making a transient fetch failure indistinguishable
from an experiment that genuinely has no scores. Separately,
RetryRequestExceptionsAdapter only retried on connection-level exceptions, so a
completed non-2xx response (e.g. a 502 from a proxy hiccup) never entered the
retry path at all.
- RetryRequestExceptionsAdapter now retries responses with a transient status
(429/500/502/503/504) using the same backoff as connection-level failures.
- ExperimentSummary gains scores_fetch_error, populated when the
experiment-comparison2 fetch fails, so callers gating automation on
summary.scores can distinguish "fetch failed" from "no scores".
Fixesbraintrustdata#639
@AbhiPrasad
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will be fixed by #682, closing this PR as a result
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Experiment.summarize() silently discards scores/metrics on any fetch failure instead of surfacing or retrying


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fix: surface experiment-comparison2 fetch failures and retry transient 5xx by praneethy91 · Pull Request #640 · braintrustdata/braintrust-sdk-python · GitHub
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fix: surface experiment-comparison2 fetch failures and retry transient 5xx - #640
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Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
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praneethy91:fix/experiment-summarize-scores-fetch-error
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fix: surface experiment-comparison2 fetch failures and retry transient 5xx#640
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
braintrustdata:mainfrom 
praneethy91:fix/experiment-summarize-scores-fetch-error
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@praneethy91Praneeth Yenugutala (praneethy91)
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Jul 30, 2026

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Summary
Fixes#639.
Experiment.summarize() caught any exception from the experiment-comparison2 fetch and silently fell back to an empty {} summary, making a transient fetch failure indistinguishable from an experiment that genuinely has no scores. Meanwhile, RetryRequestExceptionsAdapter only retried on connection-level exceptions (timeouts, connection resets), so a request that completed with a non-2xx status (e.g. a 502 from a proxy hiccup) never entered the retry path at all — it went straight to raise_for_status() and got swallowed by summarize().
  • RetryRequestExceptionsAdapter.send() now also retries when a completed response has a transient status code (429/500/502/503/504), using the same exponential backoff as the existing exception-based retry path. This should eliminate most one-off 5xx blips before they ever reach summarize().
  • ExperimentSummary gains a new scores_fetch_error: str | None field, populated whenever the experiment-comparison2 fetch fails after retries are exhausted. scores/metrics still default to {} for backwards compatibility, but callers building automation (e.g. CI gates) on summary.scores can now check scores_fetch_error to tell "fetch failed" apart from "no scores." The printed str(summary) also surfaces a WARNING line when this happens.
Test plan
  • py/src/braintrust/test_http.py::TestRetryOnHttpErrorStatus — new tests covering retry-on-502, giving up after base_num_retries, and not retrying non-retryable statuses (404), using a real local HTTP server (no mocks), consistent with existing adapter tests in this file.
  • py/src/braintrust/test_framework.py::test_experiment_summarize_surfaces_scores_fetch_error — new test asserting summarize() populates scores_fetch_error (and the printed summary contains a WARNING) when the comparison fetch raises.
  • cd py && uv run nox -s test_core — full core suite passes (614 passed, 63 skipped, 12 xfailed).
  • cd py && uv run nox -s pylint — clean.
  • cd py && uv run pre-commit run --files ... on changed files — clean.
Praneeth Yenugutala
fix: surface experiment-comparison2 fetch failures and retry transien…
93cc7ca
…t 5xx
Experiment.summarize() swallowed any exception from the experiment-comparison2
fetch into an empty {} summary, making a transient fetch failure indistinguishable
from an experiment that genuinely has no scores. Separately,
RetryRequestExceptionsAdapter only retried on connection-level exceptions, so a
completed non-2xx response (e.g. a 502 from a proxy hiccup) never entered the
retry path at all.
- RetryRequestExceptionsAdapter now retries responses with a transient status
(429/500/502/503/504) using the same backoff as connection-level failures.
- ExperimentSummary gains scores_fetch_error, populated when the
experiment-comparison2 fetch fails, so callers gating automation on
summary.scores can distinguish "fetch failed" from "no scores".
Fixesbraintrustdata#639
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
commented
Aug 12, 2026

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will be fixed by #682, closing this PR as a result
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
mentioned this pull request
Aug 12, 2026
 Closed

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Experiment.summarize() silently discards scores/metrics on any fetch failure instead of surfacing or retrying


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fix: surface experiment-comparison2 fetch failures and retry transient 5xx by praneethy91 · Pull Request #640 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
fix: surface experiment-comparison2 fetch failures and retry transient 5xx - #640
Closed
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
braintrustdata:mainfrom 
praneethy91:fix/experiment-summarize-scores-fetch-error
Closed
fix: surface experiment-comparison2 fetch failures and retry transient 5xx#640
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
braintrustdata:mainfrom 
praneethy91:fix/experiment-summarize-scores-fetch-error
Conversation
@praneethy91
@praneethy91Praneeth Yenugutala (praneethy91)
commented
Jul 30, 2026

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Summary
Fixes#639.
Experiment.summarize() caught any exception from the experiment-comparison2 fetch and silently fell back to an empty {} summary, making a transient fetch failure indistinguishable from an experiment that genuinely has no scores. Meanwhile, RetryRequestExceptionsAdapter only retried on connection-level exceptions (timeouts, connection resets), so a request that completed with a non-2xx status (e.g. a 502 from a proxy hiccup) never entered the retry path at all — it went straight to raise_for_status() and got swallowed by summarize().
  • RetryRequestExceptionsAdapter.send() now also retries when a completed response has a transient status code (429/500/502/503/504), using the same exponential backoff as the existing exception-based retry path. This should eliminate most one-off 5xx blips before they ever reach summarize().
  • ExperimentSummary gains a new scores_fetch_error: str | None field, populated whenever the experiment-comparison2 fetch fails after retries are exhausted. scores/metrics still default to {} for backwards compatibility, but callers building automation (e.g. CI gates) on summary.scores can now check scores_fetch_error to tell "fetch failed" apart from "no scores." The printed str(summary) also surfaces a WARNING line when this happens.
Test plan
  • py/src/braintrust/test_http.py::TestRetryOnHttpErrorStatus — new tests covering retry-on-502, giving up after base_num_retries, and not retrying non-retryable statuses (404), using a real local HTTP server (no mocks), consistent with existing adapter tests in this file.
  • py/src/braintrust/test_framework.py::test_experiment_summarize_surfaces_scores_fetch_error — new test asserting summarize() populates scores_fetch_error (and the printed summary contains a WARNING) when the comparison fetch raises.
  • cd py && uv run nox -s test_core — full core suite passes (614 passed, 63 skipped, 12 xfailed).
  • cd py && uv run nox -s pylint — clean.
  • cd py && uv run pre-commit run --files ... on changed files — clean.
Praneeth Yenugutala
fix: surface experiment-comparison2 fetch failures and retry transien…
93cc7ca
…t 5xx
Experiment.summarize() swallowed any exception from the experiment-comparison2
fetch into an empty {} summary, making a transient fetch failure indistinguishable
from an experiment that genuinely has no scores. Separately,
RetryRequestExceptionsAdapter only retried on connection-level exceptions, so a
completed non-2xx response (e.g. a 502 from a proxy hiccup) never entered the
retry path at all.
- RetryRequestExceptionsAdapter now retries responses with a transient status
(429/500/502/503/504) using the same backoff as connection-level failures.
- ExperimentSummary gains scores_fetch_error, populated when the
experiment-comparison2 fetch fails, so callers gating automation on
summary.scores can distinguish "fetch failed" from "no scores".
Fixesbraintrustdata#639
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
commented
Aug 12, 2026

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will be fixed by #682, closing this PR as a result
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
mentioned this pull request
Aug 12, 2026
 Closed

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Experiment.summarize() silently discards scores/metrics on any fetch failure instead of surfacing or retrying


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@praneethy91@AbhiPrasad

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fix: surface experiment-comparison2 fetch failures and retry transient 5xx by praneethy91 · Pull Request #640 · braintrustdata/braintrust-sdk-python · GitHub
Skip to content
fix: surface experiment-comparison2 fetch failures and retry transient 5xx - #640
Closed
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
braintrustdata:mainfrom 
praneethy91:fix/experiment-summarize-scores-fetch-error
Closed
fix: surface experiment-comparison2 fetch failures and retry transient 5xx#640
Praneeth Yenugutala (praneethy91) wants to merge 1 commit into
braintrustdata:mainfrom 
praneethy91:fix/experiment-summarize-scores-fetch-error
Conversation
@praneethy91
@praneethy91Praneeth Yenugutala (praneethy91)
commented
Jul 30, 2026

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Summary
Fixes#639.
Experiment.summarize() caught any exception from the experiment-comparison2 fetch and silently fell back to an empty {} summary, making a transient fetch failure indistinguishable from an experiment that genuinely has no scores. Meanwhile, RetryRequestExceptionsAdapter only retried on connection-level exceptions (timeouts, connection resets), so a request that completed with a non-2xx status (e.g. a 502 from a proxy hiccup) never entered the retry path at all — it went straight to raise_for_status() and got swallowed by summarize().
  • RetryRequestExceptionsAdapter.send() now also retries when a completed response has a transient status code (429/500/502/503/504), using the same exponential backoff as the existing exception-based retry path. This should eliminate most one-off 5xx blips before they ever reach summarize().
  • ExperimentSummary gains a new scores_fetch_error: str | None field, populated whenever the experiment-comparison2 fetch fails after retries are exhausted. scores/metrics still default to {} for backwards compatibility, but callers building automation (e.g. CI gates) on summary.scores can now check scores_fetch_error to tell "fetch failed" apart from "no scores." The printed str(summary) also surfaces a WARNING line when this happens.
Test plan
  • py/src/braintrust/test_http.py::TestRetryOnHttpErrorStatus — new tests covering retry-on-502, giving up after base_num_retries, and not retrying non-retryable statuses (404), using a real local HTTP server (no mocks), consistent with existing adapter tests in this file.
  • py/src/braintrust/test_framework.py::test_experiment_summarize_surfaces_scores_fetch_error — new test asserting summarize() populates scores_fetch_error (and the printed summary contains a WARNING) when the comparison fetch raises.
  • cd py && uv run nox -s test_core — full core suite passes (614 passed, 63 skipped, 12 xfailed).
  • cd py && uv run nox -s pylint — clean.
  • cd py && uv run pre-commit run --files ... on changed files — clean.
Praneeth Yenugutala
fix: surface experiment-comparison2 fetch failures and retry transien…
93cc7ca
…t 5xx
Experiment.summarize() swallowed any exception from the experiment-comparison2
fetch into an empty {} summary, making a transient fetch failure indistinguishable
from an experiment that genuinely has no scores. Separately,
RetryRequestExceptionsAdapter only retried on connection-level exceptions, so a
completed non-2xx response (e.g. a 502 from a proxy hiccup) never entered the
retry path at all.
- RetryRequestExceptionsAdapter now retries responses with a transient status
(429/500/502/503/504) using the same backoff as connection-level failures.
- ExperimentSummary gains scores_fetch_error, populated when the
experiment-comparison2 fetch fails, so callers gating automation on
summary.scores can distinguish "fetch failed" from "no scores".
Fixesbraintrustdata#639
@AbhiPrasad
Abhijeet Prasad (AbhiPrasad)
commented
Aug 12, 2026

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will be fixed by #682, closing this PR as a result
@AbhiPrasadAbhijeet Prasad (AbhiPrasad)
mentioned this pull request
Aug 12, 2026
 Closed

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Experiment.summarize() silently discards scores/metrics on any fetch failure instead of surfacing or retrying


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