fix(errors): sanitise the string detail and error.message forms - #174
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The models.run() 422 path built its message by joining the raw detail[] entries' bare `msg` values, bypassing the excerpt sanitiser: a server-, proxy- or provider-supplied `msg` carrying newlines, C0/C1 controls, ANSI escapes or bidi overrides reached str(exc), tracebacks and log lines verbatim and unbounded, and many long entries made the string arbitrarily large. It also disagreed with the queued path on `.detail` for one wire body — two `field required` entries collapsed to the unrecoverable `field required; field required` on run() while the queued surface named both fields. - Add comfy_low.summarise_detail(): renders each entry as `<loc>: <msg>` and runs the joined line through clean_body_excerpt (unprintable reduction, whitespace collapse, 256-char cap). Both error_from_envelope (awaited run path) and router_exceptions (queued path) now summarise the same array through this one function, so one wire body yields one string; the redundant _summarise is removed. - to_sdk_error: a detail[] array selects a RouterError even under a bucket the v2 envelope also spells (unauthorized/forbidden/insufficient_credits) or the status-derived invalid_workflow guess a stripped X-Comfy-Error-Type falls to — the array only Router sends, so it identifies the surface. The typed entries and summary are no longer dropped, including when the body also carried error.message. - Correct _clean's docstring: the list detail shape still reaches it through the message = _clean(raw_detail) fallback, so its isinstance guard is load-bearing (it keeps a Python list repr out of the caller's message). Regression tests per item; run/queued `.detail` parity asserted. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
`main` landed #157, which merged the two exception hierarchies: the three buckets both surfaces spell alike (`unauthorized`, `forbidden`, `insufficient_credits`) are one `RouterError` subclass each now, and `_class_for` replaced `_router_only_class`. That dissolves the collision this branch's `to_sdk_error` guard was written for, and it dissolves it *properly*: for any response carrying real Router provenance, `_class_for` already resolves to a `RouterError` subclass -- the only `_BY_CODE`/bucket overlaps are those three, every other bucket hits `_BY_ERROR_TYPE`, and an unknown bucket falls back to `RouterError` -- so the typed `detail[]` entries are forwarded without any help from here. What the guard still did beyond that was the regression 4 of 6 panel reviewers flagged: it rerouted on the ARRAY, a body shape any server, proxy or gateway can send (a FastAPI `RequestValidationError` is exactly it), so a bucket-less 422 stopped raising `InvalidWorkflow` and `except InvalidWorkflow` silently went dead -- and the elected `RouterError` dropped `exc.details` and stamped a v2-vocabulary code onto `.error_type`. It also contradicted the rule `error_from_envelope` already documents, learned three times on live traffic: only a response that carries a BUCKET gets retyped. So the guard is removed and its tests now pin the opposite -- a bucket-less array keeps its v2 class, with the per-field reasons still reaching the caller through the summary. The sanitise-and-unify core is unchanged, plus the panel's other fixes: - `summarise_detail` stops accumulating at the excerpt budget instead of rendering a server-controlled array in full and slicing 256 chars off it. - A `loc` member that is not a path segment is dropped rather than coerced, so a nested one can no longer put a Python repr into the user-visible message. `ValidationErrorDetail.loc`/`.location` get the same treatment and now delegate to the one renderer, so the two cannot drift. - CHANGELOG entry for the user-visible message change. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The `detail[]` array summary and the body excerpts are reduced by `clean_body_excerpt` -- unprintable categories replaced, whitespace collapsed to one line, capped at 256 characters -- before they reach `str(exc)`. The three STRING forms of the same text were not: a Router request-level `detail` and a v2 envelope's `error.message` were `.strip()`ed and handed on verbatim. A server, a proxy or a provider in front of either surface could therefore put ANSI escape sequences, a bidi override, NUL bytes, newlines and ten thousand characters of padding straight into a traceback or a log line, on all four builders: `error_from_envelope`'s two reads, `error_from_response` and `error_from_completion`. All four now use `clean_body_excerpt`. `_clean` stays on the CODE fields -- `error.code`, the Router bucket, a cancel refusal's `status` -- which are wire tokens that are compared and branched on, not display text: collapsing whitespace inside one would change its value rather than make it printable. `ValidationErrorDetail.msg` and `RouterError.errors` are untouched; those are data and stay raw. One behaviour change falls out of it: a whitespace-only `detail` now reads as absent on both router builders and falls to the existing status / `error_type` fallback, which is what `error_from_envelope` already did for it.
mattmillerai
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September 19, 2026 08:28
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📝 WalkthroughWalkthroughThe change centralizes error-detail sanitization and validation summarization. Router and model-run errors now emit bounded, printable messages with field locations, while raw validation entries, error types, statuses, and codes remain available. ChangesError detail formatting
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant APIResponse
participant ErrorMapper
participant DetailFormatter
participant SDKException
APIResponse->>ErrorMapper: detail, validation entries, error_type
ErrorMapper->>DetailFormatter: summarize and sanitize detail
DetailFormatter-->>ErrorMapper: bounded printable message
ErrorMapper->>SDKException: mapped exception with raw entries and metadata
Suggested reviewers: Merge Risk: 🔵 Low · up to A malformed validation entry can hide useful later error details and replace them with a generic HTTP fallback. Correct the summary accounting before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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In `@src/comfy_low/errors.py`:
- Around line 371-373: Update the summary-building loop around
clean_body_excerpt to sanitize each part before appending or measuring it; skip
parts that sanitize to empty or None, and count only the sanitized text toward
the budget so later readable entries remain eligible.
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CHANGELOG.mdsrc/comfy_low/errors.pysrc/comfy_sdk/exceptions.pysrc/comfy_sdk/router_exceptions.pytests/conftest.pytests/test_error_mapping.pytests/test_models_run.pytests/test_router_exceptions.py
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The `detail[]` summary work this branch carried landed on main as #167, so `errors.py`, `router_exceptions.py` and two of the three test files conflicted against a byte-identical counterpart -- resolved to main's copy, which is what this branch's own pre-commit tree already was. The two files that genuinely diverged keep BOTH sides: `tests/test_models_run.py` retains main's `RouterRunResult.credits_used` coverage and its `Idempotent-Replayed` un-prefixed-header assertions alongside this branch's hostile-`detail` end-to-end test, and `CHANGELOG.md` keeps main's entries with this branch's bullet appended. The merged tree is main plus exactly the diff of 4c451b3 and nothing else. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
… sanitise away
`summarise_detail` stops accumulating once it holds enough text to fill the
256-character cap, but it measured each part BEFORE `clean_body_excerpt`
reduced it. A `detail[]` entry whose `msg` is nothing but control characters
survives `_clean` -- `str.strip()` does not treat NUL as whitespace -- so a
single 2,048-character entry of them exhausted the budget on its own, broke the
loop, and then sanitised away to nothing.
Every readable entry behind it was dropped and `error_from_envelope` fell
through to a bare `HTTP 422`, which is the exact failure `summarise_detail` was
written to end. Reproduced end to end before the fix: a body of
`[{"msg": "\x00" * 2048}, {"loc": ["body", "seed"], "msg": "field required"}]`
raised `HTTP 422` and now raises `body.seed: field required`.
Each part is now reduced before it is measured or kept, and a part that reduces
to nothing is skipped rather than charged for. Output is unchanged on every
input that was already readable -- the per-part cap is the same 256 the joined
line is capped at, so a part longer than the cap still fills it identically.
The comment above the loop claimed a cost independent of body size; that is no
longer exactly true, since an array that sanitises away entirely is now walked
to the end. It is rewritten to say what holds instead: the work is proportional
to the body, the same order as the `json.loads` that produced the array and the
`validation_errors` tuple already built over it. Bounding the walk would mean
charging unreadable entries for the budget, which is the bug itself.
Reported by CodeRabbit on #174.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
…ow declares `main` is red at c0c4a33, independently of this branch, and merging it brings that failure here. Two commits that are individually fine combine badly: #166 added the `credits_used` lift while `X-Comfy-Credits-Used` was undeclared, and #177 synced a vendored spec that declares it. The tripwire in `test_router_spec_contract.py` fired exactly as designed -- it asserts the absence precisely so a sync that closes the gap cannot pass unnoticed -- and its message names the reconciliation: move the entry into `_CONTRACT_HEADER_LIFTS` so it is pinned like the rest. Done here, which strengthens the coverage rather than removing it: the field goes from one assertion that the contract does NOT name its header to two that it does and that the lift reads that declared name. `_UNDECLARED_HEADER_LIFTS` is now empty, so the tripwire parametrises to nothing and skips; it is kept for the next lift added ahead of its contract, and its docstring records the trip `credits_used` just made. One wrinkle the move surfaced: `test_the_lift_actually_reads_the_declared_name` proves a lift reads its name by showing the field changes when the header is present, probing with the literal `"x"`. `_credits_used` drops anything that is not a finite decimal, so `"x"` normalises to `None` -- the same value as absent -- and the pin would have failed on a lift that is working correctly. Probe values are now per-field, defaulting to `"x"`, with `credits_used` probed as `"1.25"`, and the failure message points at the table. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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@coderabbitai review The one actionable finding from the last round is fixed in e87d842 and its thread is resolved: This round also merged |
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STACKED — merging lands on
matt/be-15633-run-422-sanitise-detail(owned by @mattmillerai, PR #167), NOTmain. Do not merge this before #167. Its hunks inerror_from_envelopeanderror_from_responsesit directly against the lines this PR changes, so basing onmainwould have conflicted; GitHub will retarget this PR tomainwhen #167 merges and its branch is deleted.ELI-5
When a request fails, the SDK builds an exception out of whatever the server said. Some of that text was already being cleaned up before it was shown — control characters turned into spaces, everything squashed onto one line, cut off at 256 characters — because an error message is printed into a terminal and a log, and a server (or a proxy, or a model provider standing behind one) can put anything at all in it. But only some of it. Three of the ways the same human-readable string arrives were still passed through untouched, so a
detailfull of terminal escape codes, a right-to-left override and ten thousandxes landed in your traceback exactly as sent. Now all of them get the same clean-up.What changed
Four builders handed a server-, proxy- or provider-supplied string to
str(exc)with at most a.strip():src/comfy_low/errors.pyerror_from_envelopeerror.messagesrc/comfy_low/errors.pyerror_from_envelopedetailsrc/comfy_sdk/router_exceptions.pyerror_from_responsedetail = raw_detail or Nonesrc/comfy_sdk/router_exceptions.pyerror_from_completiondetail = raw_detail or NoneAll four now go through
comfy_low.errors.clean_body_excerpt— the same function thedetail[]array summary (#167) and every body excerpt already use:Cc/Cf/Co/Cscharacters replaced with spaces, whitespace collapsed to a single line, and a 256-character cap, with only a bounded head of the input examined so the cost of describing a body does not scale with the body.Deliberately not changed:
_clean—error.code, the Router bucket (error_type, header and body), a cancel refusal'sstatus. Those are wire tokens that get compared and branched on;clean_body_excerpt's whitespace collapse and 256-char cap would change a value rather than make it printable.ValidationErrorDetail.msgandRouterError.errors/ApiError.validation_errors— those are data, raw by design. See Residual.clean_body_excerptis imported from the module (from comfy_low.errors import ...) exactly asclean_request_idandsummarise_detailalready are. No new public re-export.Docs: the
error_from_envelopedocstring now states that bothdetailspellings anderror.messageare reduced;_clean's docstring says what is left to it and why; theRouterError.detailattribute comment says the value is sanitised and capped at 256 when it came off the wire (and that constructing the class by hand bypasses that); one Fixed entry under## [Unreleased].Behaviour change
clean_body_excerptreturnsNonefor a non-string or a blank input, exactly as_cleandid, so thedetail[]list guard, theHTTP <status>fallback and the message-foundbody_excerptgate all behave as before. One difference is real and intended: a whitespace-onlydetailnow reads as absent on both router builders and falls to the existing fallback (HTTP 502, orthe request completed with error_type '<bucket>') instead of surfacing as a blank description. That matches whaterror_from_envelopealready did for the same input. Adetailmade entirely of unprintable characters ("\x00\x00") reduces to nothing the same way, and the body excerpt is then kept rather than dropped — strictly more information than before.How this was tested
Red-then-green, verified by reverting only the two source files and re-running: 10 of the 14 new tests fail without the change (the other 4 assert pre-existing invariants the change must not break).
tests/test_error_mapping.py—error_from_envelopeparametrised over the Router stringdetailand the v2error.message, withHOSTILE = "\x1b[31mBAD\x1b[0m\nreversed\x00" + "x" * 10_000: no newline, no\x1b, no, every character outside{Cc, Cf, Co, Cs},len(err.message) == _BODY_EXCERPT_LIMIT,err.body_excerpt is None. Plus: the words survive the reduction (no healthy\x00upstream\n→no healthy upstream), a blank/zero-width-onlydetailfalls back toHTTP 502, and a hostilemessagedoes not disturberror.code.tests/test_router_exceptions.py— the same assertions parametrised overerror_from_response(502, …)anderror_from_completion(…, request_id="req_1"), on.detailand onstr(exc); a" "detail yielding each builder's fallback; and.errors[0].msgconfirmed still raw while.detailis bounded.tests/test_models_run.py— one end-to-end case through the stubbed server, proving the wholemodels.run→transport.parse_or_raise→error_from_envelope→to_sdk_errorchain (the only path the SDK itself takes to a stringdetail;error_from_responsehas no in-tree caller). Needed one new knob on the fake server,ServerState.model_run_error_detail, so a test can choose the failure's human-readable string.Every pre-existing message-equality assertion passes unchanged — no expected string was edited and the sanitiser was not weakened.
Provenance
mainand the two review-round commits:uv run --extra dev pytest -q: 1029 passed, 10 skipped;ruff check .: all checks passed;ruff format --check .: 57 files already formatted;mypy src: no issues in 21 source files. All 12 PR checks green, includingTest (py3.10/3.11/3.12/3.13),comfy_low codegen driftandpublic-repo-hygiene. Red-then-green confirmed twice: reverting the two original source files gives 10 failed, 5 passed; reverting thesummarise_detailbudget fix alone fails its new regression test.summarise_detailcharged its length budget fordetail[]entries measured before sanitisation, so one entry of control characters could exhaust the budget, reduce to nothing, and cost the caller every readable entry behind it — a bareHTTP 422. Reported by CodeRabbit, reproduced end to end, fixed with a regression test.mainwas already red atc0c4a33on its own, independently of this branch: feat(models): surface X-Comfy-Credits-Used on RouterRunResult #166 added thecredits_usedlift while its header was undeclared and chore: sync vendored Comfy Router spec (cloud@427cc43) #177 synced a spec that declares it, tripping the deliberate tripwire intest_router_spec_contract.py. Mergingmainbrings that failure here, so it is reconciled the way the tripwire's own message prescribes — the lift is moved into_CONTRACT_HEADER_LIFTS, which strengthens the pin rather than removing it. No base-branch assertion was deleted or weakened.Residual
Not fixed here, and worth its own look.
ValidationErrorDetail.msgandRouterError.errors/ApiError.validation_errorsstill carry the server's bytes verbatim, and nothing bounds them. This is deliberate — they are typed data a caller branches on, not display text, and the task explicitly scoped them out — but it is a real remaining exposure on the same class of input this PR is about: a caller who printsexc.errors[0].msgor logsexc.validation_errorsdirectly gets the unreduced string, including escape sequences and unbounded length.summarise_detailprotects only the summary it builds. If that is to be closed, the answer is probably a documented display accessor rather than sanitising the data, since sanitising it would destroy the field's value as data.RouterError(detail=...)constructed by hand is not sanitised. The reduction lives in the three builders, not in__init__, so anything outside this module that constructs the class directly with server text is still exposed. I documented that on the attribute rather than moving the reduction into the constructor (which would also reduce the SDK's own status-derived fallback sentences). No in-tree caller does this today.detailis a silent behaviour change for anyone who was reading it. It is in the changelog, but it is the one thing in this PR a downstream assertion could notice.Not exercised.
AGENTS.md). The claim that a real intermediary sends such adetailis inference from the shapes the code already handles, not something I observed on live traffic.not supported/unavailable/STOPstring, no throw or deny dead-end, and flips no test to assert one. The only reachability change is a whitespace-onlydetailrouting to an existing fallback that already produced a useful message.src/comfy_low/andsrc/comfy_sdk/for every read of a server-supplied string that reaches a user-visible message. Four were display text and all four are fixed here; zero unsanitised display-text sites remain. Nine_clean-only reads remain and are all code tokens kept on purpose (error.code, the bucket in four places, a cancelstatus, the twoerror_type/codereads inretry.pyandmodel_requests.py). Every other.strip()in the two packages validates caller input, not wire text.Summary by CodeRabbit