Previous value: -"Keywords to search (e.g., \"median household income\", \"poverty\", \"bachelor's degree\"). Each word must match a whole word of the label or of the concept, ignoring case and punctuation, so \"rate\" does not match \"separated\". A column shared across tables, such as GEO_ID, is matched on its label only, and a margin of error on its estimate's label. When no variable contains every word, the results are the variables containing the most words, and the notice says how many that was."New value: +"Keywords to search (e.g., \"median household income\", \"poverty\", \"bachelor's degree\"), or one variable or table code (e.g., \"B19013_001E\", \"B19013\"). Each word must match a whole word of the label or of the concept, ignoring case and punctuation, so \"rate\" does not match \"separated\". A column shared across tables, such as GEO_ID, is matched on its label only, and a margin of error on its estimate's label. When no variable contains every word, the results are the variables containing the most words, and the notice says how many that was. A single token that equals a variable code or a table ID, ignoring case and any quotes or punctuation around it, returns those variables first. A token with no digit or underscore, such as \"state\", is read as a code when no keyword matched; ahead of keyword matches only when typed in the code's own uppercase (\"STATE\")."

Previous value: -"Machine-readable failure mode. Declared by this tool: `dataset_not_found`: Dataset code is not recognized, even after case and shorthand resolution. `year_not_available`: The dataset does not serve the requested vintage year. `variables_unavailable`: Variable metadata could not be fetched or parsed from the Census API. Other values are possible when a failure originates below the handler."New value: +"Machine-readable failure mode. Declared by this tool: `dataset_not_found`: Dataset code is not recognized, even after case and shorthand resolution. `year_not_available`: The dataset does not serve the requested vintage year. `variables_unavailable`: Variable metadata could not be fetched or parsed from the Census API. `upstream_error`: The Census API answered the dataset's variables.json with an HTTP error, after any retries a transient status earns. Other values are possible when a failure originates below the handler."

Previous value: -[
-  "dataset_not_found",
-  "year_not_available",
-  "variables_unavailable"
-]New value: +[
+  "dataset_not_found",
+  "year_not_available",
+  "variables_unavailable",
+  "upstream_error"
+]

Previous value: -"Guidance when no variables matched, when no variable contained every query word and the results hold only some of them, or when results were truncated — suggests other keywords, a narrower query, or a higher limit."New value: +"Guidance when no variables matched, when no variable contained every query word and the results hold only some of them, or when results were truncated — suggests other keywords, a narrower query, or a higher limit. For a code the dataset does not publish, it names the sibling dataset confirmed to hold it, or census_get_variable for an attribute column (annotation, flag, label, or significance); for a table cut at the limit, the last code shown."

Previous value: -"Variables that contain every query word, before the limit was applied — or, when none does, the variables that contain the most words."New value: +"Variables matched before the limit was applied: those matching the query as a code, plus those containing every query word — or, when none does and no code matched, the variables that contain the most words."

Previous value: -"Matching variables, best first: a variable whose label's last !!-separated segment or whose whole concept equals the query, then the query as a phrase in both label and concept, in the label only, in the concept only, then every word present but not as a phrase; ties go to fewer !! segments in the label, then a shorter concept, then the code, which puts an E estimate before its M margin of error. On ACS datasets, codes ending in E are estimates and M are their margins of error, except on the comparison profiles, which publish no M codes; on other datasets the suffix carries no such meaning."New value: +"Matching variables, best first: the variable whose code equals the query, or every variable of the table whose ID equals it, in code order; then a variable whose label's last !!-separated segment or whose whole concept equals the query, then the query as a phrase in both label and concept, in the label only, in the concept only, then every word present but not as a phrase; ties go to fewer !! segments in the label, then a shorter concept, then the code, which puts an E estimate before its M margin of error. On ACS datasets, codes ending in E are estimates and M are their margins of error, except on the comparison profiles, which publish no M codes; on other datasets the suffix carries no such meaning."

Previous value: -"Dataset to search within (default: \"acs/acs5\"). Use census_list_datasets to discover options."New value: +"Dataset to search within (default: \"acs/acs5\"). Use census_list_datasets to discover options. Case is ignored, and a two-part code can be given by its last part alone — \"acs5\" is acs/acs5, \"pl\" is dec/pl. Three-part codes such as acs/acs5/profile must be given in full. The response echoes the resolved code, and the default year is that dataset's latest."

Previous value: -"Keyword to search (e.g., \"median household income\", \"poverty\", \"bachelor's degree\"). Multi-word queries search for all terms."New value: +"Keywords to search (e.g., \"median household income\", \"poverty\", \"bachelor's degree\"). Each word must match a whole word of the label or of the concept, ignoring case and punctuation, so \"rate\" does not match \"separated\". A column shared across tables, such as GEO_ID, is matched on its label only, and a margin of error on its estimate's label. When no variable contains every word, the results are the variables containing the most words, and the notice says how many that was."

Previous value: -"Machine-readable failure mode. Declared by this tool: `dataset_not_found`: Dataset code is not recognized. `year_not_available`: The dataset does not serve the requested vintage year. `variables_unavailable`: Variable metadata could not be fetched or parsed from the Census API. Other values are possible when a failure originates below the handler."New value: +"Machine-readable failure mode. Declared by this tool: `dataset_not_found`: Dataset code is not recognized, even after case and shorthand resolution. `year_not_available`: The dataset does not serve the requested vintage year. `variables_unavailable`: Variable metadata could not be fetched or parsed from the Census API. Other values are possible when a failure originates below the handler."

Previous value: -"Guidance when no variables matched, or when results were truncated — suggests broader keywords, a narrower query, or a higher limit."New value: +"Guidance when no variables matched, when no variable contained every query word and the results hold only some of them, or when results were truncated — suggests other keywords, a narrower query, or a higher limit."

Previous value: -"Total variables matching the query before the limit was applied."New value: +"Variables that contain every query word, before the limit was applied — or, when none does, the variables that contain the most words."

Previous value: -"Matching variables sorted by relevance. On ACS datasets, codes ending in E are estimates and M are their margins of error; on other datasets the suffix carries no such meaning."New value: +"Matching variables, best first: a variable whose label's last !!-separated segment or whose whole concept equals the query, then the query as a phrase in both label and concept, in the label only, in the concept only, then every word present but not as a phrase; ties go to fewer !! segments in the label, then a shorter concept, then the code, which puts an E estimate before its M margin of error. On ACS datasets, codes ending in E are estimates and M are their margins of error, except on the comparison profiles, which publish no M codes; on other datasets the suffix carries no such meaning."

Previous value: -"Concept group the variable belongs to (e.g., \"MEDIAN HOUSEHOLD INCOME\")."New value: +"Concept of the table the variable belongs to (e.g., \"Median Household Income in the Past 12 Months\"). Absent for a column shared across tables, such as GEO_ID, whose concept joins every table it appears in, and for a column the dataset publishes no concept for, such as STATE."

Previous value: -"Corresponding estimate variable code when this is a margin-of-error variable. ACS datasets only — no other family publishes margins of error."New value: +"Corresponding estimate variable code when this is a margin-of-error variable. ACS datasets only, apart from the comparison profiles — no other dataset publishes margins of error."

Previous value: -"Corresponding margin-of-error variable code when this is an estimate variable. Request both estimate and MOE in census_query_data for complete data. ACS datasets only — on other families an E-final code is an ordinary code with no margin-of-error sibling, so the field is absent."New value: +"Corresponding margin-of-error variable code when this is an estimate variable. Request both estimate and MOE in census_query_data for complete data. ACS datasets only, apart from the comparison profiles (acs/acs5/cprofile, acs/acs1/cprofile) — there and on other families an E-final code has no margin-of-error sibling, so the field is absent."

Previous value: -[
-  "variable_code",
-  "label",
-  "concept",
-  "predicate_type"
-]New value: +[
+  "variable_code",
+  "label",
+  "predicate_type"
+]

Previous value: -"Maximum results to return (default: 20, max: 100). Increase if total_matches greatly exceeds the limit."New value: +"Maximum results to return (default: 20, max: 100). Increase if totalMatches greatly exceeds the limit."

Added value: +100

Added value: +1

Previous value: -"number"New value: +"integer"

Previous value: -"True when total_matches exceeded the limit and results were cut off."New value: +"True when totalMatches exceeded the limit and results were cut off."