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feat(telemetry): add masked error message and source stack frames to error_fingerprint - #1544
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| Check name | Status | Explanation | Resolution |
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| Docstring Coverage |  |
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Title check The title clearly identifies the telemetry change and the added masked error message. However, it also claims that source stack frames were added, while the changes explicitly omit stack frames. The t… Description check The description includes all required sections, explains the implementation and privacy behavior, documents verification results, and completes the checklist. The issue field uses "None," and the desc… Full details: Title check
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Explanation
The title clearly identifies the telemetry change and the added masked error message. However, it also claims that source stack frames were added, while the changes explicitly omit stack frames. The title remains partially related to the actual change.
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The description includes all required sections, explains the implementation and privacy behavior, documents verification results, and completes the checklist. The issue field uses "None," and the description does not explain the title's source-stack-frame wording, but these are non-critical omissions.
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A rabbit reads the first line bright,
Then masks the words that should stay out of sight.
A hash and template hop along,
Two hundred characters, neat and strong.
The session sends its errors on their way.
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Previous review (commit 65df0bf)Status: 2 Issues Found | Recommendation: Address before merge Overview
Issue Details (click to expand)WARNING
Files Reviewed (4 files)
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Actionable comments posted: 5
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @docs/docs/reference/telemetry.md:
- Line 52: Update the Privacy Checklist to reflect the documented `stack` field
behavior: stack frames may include shortened file paths using only the last
three path segments, with the home prefix removed. Keep the checklist consistent
with the `error_fingerprint` row.
Review comments at @packages/opencode/src/altimate/telemetry/index.ts:
- Around line 1318-1319: Update SQL detection around SQL_WORDS so error text
beginning with statements such as CREATE TABLE and DROP TABLE is redacted as
<sql redacted> before being sent as error_message. Extend the detection to cover
these statement shapes or add a conservative fallback in the errorDetail flow,
preserving existing redaction behavior.
- Around line 1762-1764: Update the credential-redaction rule in the
error-message sanitization flow to also mask credentials in common
colon-separated key/value formats, such as password followed by a colon and a
value. Ensure the value is redacted before the error text is persisted to
telemetry; if the format cannot be safely sanitized, omit the error text.
Review comments at @packages/opencode/src/session/prompt.ts:
- Line 2182: Update the tool-error producer so `part.state.error` retains stack
frames from the original execution error, or pass the original error to
`Telemetry.errorDetail` instead of only its message. Preserve the existing
telemetry flow for `errorDetail` to extract frames from ordinary tool failures.
Review comments at @packages/opencode/test/telemetry/error-detail.test.ts:
- Around line 62-63: Update the credential URI fixtures in the error-detail test
to avoid hardcoded PostgreSQL credentials, using separately defined test values
or an accepted fixture form. Preserve the userinfo-masking assertions for both
username and password.
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All reported issues were addressed across 4 files
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Actionable comments posted: 3
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Inline comments:
Review comments at @docs/docs/reference/telemetry.md:
- Line 52: Update the error_fingerprint description to match
templateErrorMessage’s behavior: clarify that plain lowercase words, including
unqualified identifiers, may remain, and that masking applies to numbers, paths,
URLs, quoted values, capitalized names, and tokens containing other characters.
Review comments at @packages/opencode/src/altimate/telemetry/error-detail.ts:
- Around line 32-34: Update the token classification in the error-detail logic
so only lowercase words or words with a single leading capital pass through;
mask mixed-case tokens, including those beginning with lowercase. Track whether
the previous token is a credential key from the sensitive-key set followed by a
colon, and mask the next token in that case. Preserve existing placeholder and
token-position handling.
Review comments at @packages/opencode/test/telemetry/error-detail.test.ts:
- Around line 21-22: Replace the hardcoded Base64 credential passed to
templateErrorMessage with a runtime-generated Basic-auth fixture, keeping the
masking assertion unchanged.
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All reported issues were addressed across 5 files
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Review comments at @packages/opencode/src/altimate/telemetry/error-detail.ts:
- Line 49: Update the credential detection around CREDENTIAL_WORDS so compound
keys such as client_secret and access_token cause the following value to receive
CREDENTIAL_SPAN instead of being retained as plain text.
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…print` `error_fingerprint` carried only a hash of the error. It now also carries `error_message`: an allowlist template of the error's first line in which identifiers, numbers, quoted text, names and credential values become `<x>`. `maskString` and the fingerprint hash input are unchanged. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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A token with a part starting with a credential stem (pass, secret, token, key, auth, credential, bearer, pwd, cookie, session) now masks everything after it on the line. `client_secret: a b c`, `access_token=x y` and `passphrase a b c` sent their values before. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Inline comments:
Review comments at @docs/docs/reference/telemetry.md:
- Line 164: Update the telemetry privacy list to qualify its claim that SQL
queries are never collected, so it acknowledges that plain-letter SQL fragments
may survive the `error_fingerprint` template unchanged. Keep the qualification
consistent with the existing exception.
Review comments at @packages/opencode/src/altimate/telemetry/error-detail.ts:
- Line 67: Update templateErrorMessage so masking quoted strings preserves
credential labels for isCredential to detect before telemetry serialization;
ensure values for quoted keys such as password are redacted, and add a
regression case covering a quoted credential key.
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… or escape Quoted labels (`"password": x`), backslash-escaped quotes and paths containing spaces could carry values past the token-by-token template. The line is now cut at the token holding the first credential stem or path separator and the rest masked. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Typographic quotes and other non-ASCII delimiters wrapped user content the ASCII quote handling did not see. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Split the first line into letter runs and keep only words in `ERROR_VOCABULARY`; every other run becomes `<x>`. Drops the punctuation/quote/credential-stem heuristics, which could not be made complete. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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1 issue found across 2 files (changes from recent commits).
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<file name="packages/opencode/src/altimate/telemetry/error-detail.ts">
<violation number="1" location="packages/opencode/src/altimate/telemetry/error-detail.ts:67">
P2: The new non-ASCII class also matches TAB, and `cutAtUnsafe` only looks for spaces when finding the token start. A message like `Error:\tfoo bar` therefore collapses to just `<x>`, where it previously kept its plain-word shape. Exclude TAB from the class so ordinary whitespace does not trigger the cut.</violation>
</file>
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| // The line is cut at the token holding the first of: a credential stem (also inside quotes or a | ||
| // compound key), a path separator, an escape, a backtick, or any non-ASCII character (typographic quotes and the like). Everything from there on is masked, because a | ||
| // value, path or escaped string can run on past whitespace and quote boundaries. | ||
| const CUT = new RegExp(`${CREDENTIAL_STEMS.join("|")}|[\\\\/\x60]|[^\\x20-\\x7e]`, "i") |
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P2: The new non-ASCII class also matches TAB, and cutAtUnsafe only looks for spaces when finding the token start. A message like Error:\tfoo bar therefore collapses to just <x>, where it previously kept its plain-word shape. Exclude TAB from the class so ordinary whitespace does not trigger the cut.
Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. When an issue isn't valid or won't be fixed in this PR, reply in its thread with the reason and then resolve the thread. At packages/opencode/src/altimate/telemetry/error-detail.ts, line 67:
<comment>The new non-ASCII class also matches TAB, and `cutAtUnsafe` only looks for spaces when finding the token start. A message like `Error:\tfoo bar` therefore collapses to just `<x>`, where it previously kept its plain-word shape. Exclude TAB from the class so ordinary whitespace does not trigger the cut.</comment>
<file context>
@@ -62,9 +62,9 @@ const isCredential = (token: string) =>
+// compound key), a path separator, an escape, a backtick, or any non-ASCII character (typographic quotes and the like). Everything from there on is masked, because a
// value, path or escaped string can run on past whitespace and quote boundaries.
-const CUT = new RegExp(`${CREDENTIAL_STEMS.join("|")}|[\\\\/\x60]`, "i")
+const CUT = new RegExp(`${CREDENTIAL_STEMS.join("|")}|[\\\\/\x60]|[^\\x20-\\x7e]`, "i")
function cutAtUnsafe(line: string): string {
</file context>
| const CUT = new RegExp(`${CREDENTIAL_STEMS.join("|")}|[\\\\/\x60]|[^\\x20-\\x7e]`, "i") | |
| const CUT = new RegExp(`${CREDENTIAL_STEMS.join("|")}|[\\\\/\x60]|[^\\x09\\x20-\\x7e]`, "i") |
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Issue for this PR
None.
Type of change
What does this PR do?
Today
error_fingerprintcarries only a hash of the error. You can tell an error is frequent, but not what kind of error it is. This adds one optional field,error_message, built so that user text cannot reach it.error_messageis built from a fixed vocabulary. The first line of the error is split into words, and each word is kept only if it is inERROR_VOCABULARY, a sorted list of 363 common error words such as "cannot", "delete", "file", "permission", "denied", "connection", "refused" and "timeout". Every other run of characters becomes<x>, and the result is capped at 200 characters. The output can only ever contain vocabulary words,<x>and spaces. That rules out identifiers, paths, numbers, quoted values, names, SQL objects and non-ASCII text.The vocabulary deliberately leaves out credential words (password, secret, token, key, auth, cookie, session, bearer and similar), so they never appear.
Example:
Cannot delete file /Users/alice/acme.sql: permission deniedbecomescannot delete file <x> permission denied.maskStringand the fingerprint hash input are unchanged. The new code is insrc/altimate/telemetry/error-detail.ts, andsession/prompt.tscallsErrorDetail.describeToolErrorandErrorDetail.buildErrorFingerprintEvent.docs/docs/reference/telemetry.mdis updated: theerror_fingerprintrow, and the Privacy section.Earlier versions of this PR used regex masking and then a word-shape template. Review kept finding new ways for user text to get through, such as quotes, escapes, Unicode and credential-label forms. The fixed vocabulary closes that class by construction. The cost is that a message only stays readable when its words are in the list, and the list is a judgment call worth a look.
How did you verify your code works?
bun test test/telemetry test/altimate/telemetry-safety.test.ts: 410 pass, 0 fail.<x>or a vocabulary word, with no credential word and no user word. The inputs cover alphabetic and compound credentials; typographic, backtick and escaped quotes; paths with spaces; SQL with identifiers; names; base64; emails; URLs; and non-ASCII text.bun run typecheck: clean. Upstream marker check: ok. GitGuardian: no secrets.Screenshots / recordings
Not a UI change.
Checklist
🤖 Generated with Claude Code