error
A Claude Code settings key, read out of the shipped bundle. It was in the build from v2.1.281 and was gone by v2.1.317.
claude mcp list now tells you why a server failed, like a timeout or HTTP error, not just "Failed to connect".
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.219.
In the changelogs
26Releases whose published page names error.
-
v2.1.296
Results of forked slash commands can be reformatted, and background agent failures carry a cause
Forked slash command results can now pass through an optional formatter, and background agent failures now say why they failed
found in this entry's text
-
v2.1.296
Usage data now drops error text that is not a short code
An
errorvalue in usage data is dropped unless it is a short code of lowercase letters, digits and underscoresfound in this entry's text
-
v2.1.280
New terminal/failure states for a bounded operation ('refused', 'input_too_long')
A bounded operation's list of failure outcomes grew to include 'refused' and 'input_too_long'
found in this entry's text
-
v2.1.275
Assistant transcript entries now carry request_id and structured error/uuid/timestamp fields directly
Assistant transcript entries now explicitly store a request_id alongside error, uuid, and timestamp
found in this entry's text
-
v2.1.273
Plugin sync list-fetch now retries once on failure instead of always erroring immediately
Plugin marketplace sync now returns a structured error instead of crashing when a later page of results fails to load
found in this entry's text
-
v2.1.271
Sandbox scrub/cleanup now deferred until the spawned process actually exits
Sandbox cleanup now waits for the spawned process to actually exit before scrubbing
found in this entry's text
-
v2.1.268
Sandbox schema additions: MITM proxy domain routing and env-var credential masking with JWT decode
Sandbox config gains schemas for routing traffic through a MITM proxy and masking credentials in environment variables, including JWT handling
found in this entry's text
-
v2.1.268
OTel span/error telemetry now separates a normalized error_class from the raw error message, and can suppress the raw message off-box
Telemetry now records a normalized error_class alongside error text, and can drop the raw message off-box
found in this entry's text
-
v2.1.263
New gated behavior: tengu_polished_dewdrop controls a 'drop/block/error' response
A new hidden switch, settable via env var, can make certain responses silently drop or error instead.
found in this entry's text
-
v2.1.247
Plugins can walk you through multi-step configuration
Plugins with configuration steps now walk you through them one form at a time.
found in this entry's text
-
v2.1.246
Artifact request failures say when the sandbox proxy blocked them
A blocked network request no longer looks like an artifact permissions problem.
found in this entry's text
-
v2.1.242
Read tool returns PDF pages as structured entries with per-page errors
One unreadable PDF page no longer costs you the rest of the document.
found in this entry's text
-
v2.1.236
The SDK and IDE bridge stops accepting work once the session is shutting down
While a session shuts down the bridge refuses new work except a few read-only requests.
found in this entry's text
-
v2.1.235
Account-on-hold handling is built end-to-end but dark behind
tengu_lively_beaver(fallback: off)A full account-on-hold sign-in flow was added but stays unreachable pending a server-side gate
found in this entry's text
-
v2.1.223
API error metadata is recovered from wrapped errors
Error reports now keep the status code and request id even when the error was wrapped.
found in this entry's text
-
v2.1.221
sandbox.credentials.files gains a
maskmode with regex extractionYou can mask secrets in credential files so sandboxed commands see placeholders while real values are swapped in on egress.
found in this entry's text
-
v2.1.219
claude mcp listshows why a server failedclaude mcp list now tells you why a server failed, like a timeout or HTTP error, not just "Failed to connect".
found in this entry's text
-
v2.1.217
MCP Tool Errors Now Throw Typed Exceptions in Workflow Scripts
found in this entry's text
-
v2.1.211
RefreshMcpTools — Re-sync MCP Server Tool Lists
found in this entry's text
-
v2.1.208
Credential masking: extract patterns with onExtractNoMatch control
found in this entry's text
- v2.1.207
-
v2.1.199
Credential Masking: Regex Extract Patterns
found in this entry's text
-
v2.1.101
Improved Error Coloring in CLI Output
found in this entry's text
-
v2.1.78
StopFailure Hook Event
found in this entry's text
-
v1.0.58
New Features
found in this entry's text
-
v1.0.30
For Theme/Plugin Developers
found in this entry's text
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
6Build by build
38One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the settings key does. All settings keys.