owenniblock · Jun 23, 2026 · Jul 6, 2026 · Jul 13, 2026 · Sep 2, 2026
@@ -907,7 +907,7 @@ The following sets of tools are available:
   - `assignees`: Usernames to assign to this issue (string[], optional)
   - `body`: Issue body content (string, optional)
   - `duplicate_of`: Issue number that this issue is a duplicate of. Only used when state_reason is 'duplicate'. (number, optional)
-  - `issue_fields`: Issue field values to set or clear. Each item requires 'field_name' and exactly one of 'value', 'field_option_name', or 'delete: true'. (object[], optional)
+  - `issue_fields`: Issue field values to set or clear. Each item requires 'field_name' and exactly one of 'value', 'field_option_name', 'field_option_names', or 'delete: true'. (object[], optional)
   - `issue_number`: Issue number to update (number, optional)
   - `labels`: Labels to apply to this issue (string[], optional)
   - `method`: Write operation to perform on a single issue.
@@ -939,7 +939,7 @@ The following sets of tools are available:
   - **Required OAuth Scopes**: `repo`
   - `after`: Cursor for pagination. Use the cursor from the previous response. (string, optional)
   - `direction`: Order direction. If provided, the 'orderBy' also needs to be provided. (string, optional)
-  - `field_filters`: Filter by custom issue field values. Each entry takes a field_name and a value; the server looks up the field and coerces the value to its type (single-select option name, text, number, or YYYY-MM-DD date). (object[], optional)
+  - `field_filters`: Filter by custom issue field values. Each entry takes a field_name and either 'value' (text, number, YYYY-MM-DD date, or single-select option name) or 'values' (multi-select option names). For multi-select fields, all listed values must be set on an issue for it to match (AND semantics) — to match any-of, make multiple list_issues calls and union the results. (object[], optional)
   - `labels`: Filter by labels (string[], optional)
   - `orderBy`: Order issues by field. If provided, the 'direction' also needs to be provided. (string, optional)
   - `owner`: Repository owner (string, required)

@@ -57,7 +57,7 @@ runtime behavior (such as output formatting) won't appear here.
   - `assignees`: Usernames to assign to this issue (string[], optional)
   - `body`: Issue body content (string, optional)
   - `duplicate_of`: Issue number that this issue is a duplicate of. Only used when state_reason is 'duplicate'. (number, optional)
-  - `issue_fields`: Issue field values to set or clear. Each item requires 'field_name' and exactly one of 'value', 'field_option_name', or 'delete: true'. (object[], optional)
+  - `issue_fields`: Issue field values to set or clear. Each item requires 'field_name' and exactly one of 'value', 'field_option_name', 'field_option_names', or 'delete: true'. (object[], optional)
   - `issue_number`: Issue number to update (number, optional)
   - `labels`: Labels to apply to this issue (string[], optional)
   - `method`: Write operation to perform on a single issue.
@@ -143,7 +143,7 @@ runtime behavior (such as output formatting) won't appear here.
 
 - **set_issue_fields** - Set Issue Fields
   - **Required OAuth Scopes**: `repo`
-  - `fields`: Array of issue field values to set. Each element must have a 'field_id' (string, the GraphQL node ID of the field) and exactly one value field: 'text_value' for text fields, 'number_value' for number fields, 'date_value' (ISO 8601 date string) for date fields, or 'single_select_option_id' (the GraphQL node ID of the option) for single select fields. Set 'delete' to true to remove a field value. (object[], required)
+  - `fields`: Array of issue field values to set. Each element must have a 'field_id' (string, the GraphQL node ID of the field) and exactly one value field: 'text_value' for text fields, 'number_value' for number fields, 'date_value' (ISO 8601 date string) for date fields, 'single_select_option_id' (the GraphQL node ID of the option) for single select fields, or 'multi_select_option_ids' (an array of GraphQL node IDs) for multi select fields. Set 'delete' to true to remove a field value. (object[], required)
   - `issue_number`: The issue number to update (number, required)
   - `owner`: Repository owner (username or organization) (string, required)
   - `repo`: Repository name (string, required)
@@ -366,7 +366,7 @@ runtime behavior (such as output formatting) won't appear here.
   - **Required OAuth Scopes**: `repo`
   - `after`: Cursor for pagination. Use the cursor from the previous response. (string, optional)
   - `direction`: Order direction. If provided, the 'orderBy' also needs to be provided. (string, optional)
-  - `field_filters`: Filter by custom issue field values. Each entry takes a field_name and a value; the server looks up the field and coerces the value to its type (single-select option name, text, number, or YYYY-MM-DD date). (object[], optional)
+  - `field_filters`: Filter by custom issue field values. Each entry takes a field_name and either 'value' (text, number, YYYY-MM-DD date, or single-select option name) or 'values' (multi-select option names). For multi-select fields, all listed values must be set on an issue for it to match (AND semantics) — to match any-of, make multiple list_issues calls and union the results. (object[], optional)
   - `fields`: Subset of fields to return for each issue. If omitted, all fields are returned. Use this to reduce response size when you only need specific fields; omitting 'body' and 'field_values' in particular drops the largest per-result data. (string[], optional)
   - `labels`: Filter by labels (string[], optional)
   - `orderBy`: Order issues by field. If provided, the 'direction' also needs to be provided. (string, optional)

@@ -51,7 +51,7 @@ The list below is generated from the Go source. It covers tool **inventory and s
   - `assignees`: Usernames to assign to this issue (string[], optional)
   - `body`: Issue body content (string, optional)
   - `duplicate_of`: Issue number that this issue is a duplicate of. Only used when state_reason is 'duplicate'. (number, optional)
-  - `issue_fields`: Issue field values to set or clear. Each item requires 'field_name' and exactly one of 'value', 'field_option_name', or 'delete: true'. (object[], optional)
+  - `issue_fields`: Issue field values to set or clear. Each item requires 'field_name' and exactly one of 'value', 'field_option_name', 'field_option_names', or 'delete: true'. (object[], optional)
   - `issue_number`: Issue number to update (number, optional)
   - `labels`: Labels to apply to this issue (string[], optional)
   - `method`: Write operation to perform on a single issue.

@@ -32,12 +32,12 @@
         "type": "number"
       },
       "issue_fields": {
-        "description": "Issue field values to set or clear. Each item requires 'field_name' and exactly one of 'value', 'field_option_name', or 'delete: true'.",
+        "description": "Issue field values to set or clear. Each item requires 'field_name' and exactly one of 'value', 'field_option_name', 'field_option_names', or 'delete: true'.",
         "items": {
           "additionalProperties": false,
           "properties": {
             "delete": {
-              "description": "Set to true to clear this field's current value on the issue. Cannot be combined with 'value' or 'field_option_name'.",
+              "description": "Set to true to clear this field's current value on the issue. Cannot be combined with 'value', 'field_option_name', or 'field_option_names'.",
               "enum": [
                 true
               ],
@@ -48,11 +48,18 @@
               "type": "string"
             },
             "field_option_name": {
-              "description": "Option name for single-select fields. Validated against the field's options before the API call. Cannot be combined with 'value' or 'delete'.",
+              "description": "Option name for single-select fields. Validated against the field's options before the API call. Cannot be combined with 'value', 'field_option_names', or 'delete'.",
               "type": "string"
             },
+            "field_option_names": {
+              "description": "Option names for multi-select fields. All names are validated against the field's options before the API call. An empty array is rejected — use 'delete: true' to clear the field. Cannot be combined with 'value', 'field_option_name', or 'delete'.",
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
             "value": {
-              "description": "Value to set. Use for text, number, and date fields (date as YYYY-MM-DD). For single-select fields, prefer 'field_option_name' so the option is validated before the API call. Cannot be combined with 'field_option_name' or 'delete'.",
+              "description": "Value to set. Use for text, number, and date fields (date as YYYY-MM-DD). For single-select fields, prefer 'field_option_name' so the option is validated before the API call. Cannot be combined with 'field_option_name', 'field_option_names', or 'delete'.",
               "type": [
                 "string",
                 "number",

@@ -4,7 +4,7 @@
     "readOnlyHint": true,
     "title": "List issue fields"
   },
-  "description": "List issue fields for a repository or organization. Returns field definitions including name, type (text, number, date, single_select), and for single_select fields the list of valid option names. When repo is omitted, returns org-level fields directly.",
+  "description": "List issue fields for a repository or organization. Returns field definitions including name, type (text, number, date, single_select, multi_select), and for single_select and multi_select fields the list of valid option names. When repo is omitted, returns org-level fields directly.",
   "inputSchema": {
     "properties": {
       "owner": {

@@ -20,21 +20,27 @@
         "type": "string"
       },
       "field_filters": {
-        "description": "Filter by custom issue field values. Each entry takes a field_name and a value; the server looks up the field and coerces the value to its type (single-select option name, text, number, or YYYY-MM-DD date).",
+        "description": "Filter by custom issue field values. Each entry takes a field_name and either 'value' (text, number, YYYY-MM-DD date, or single-select option name) or 'values' (multi-select option names). For multi-select fields, all listed values must be set on an issue for it to match (AND semantics) — to match any-of, make multiple list_issues calls and union the results.",
         "items": {
           "properties": {
             "field_name": {
               "description": "Name of the custom field (e.g. \"Priority\"). Case-insensitive.",
               "type": "string"
             },
             "value": {
-              "description": "Value to filter on. For single-select fields, the option name (e.g. \"P1\"). For dates, YYYY-MM-DD. For numbers, the numeric value as a string. For text, the text value.",
+              "description": "Value to filter on for text, number, date, or single-select fields. For single-select, the option name (e.g. \"P1\"). For dates, YYYY-MM-DD. For numbers, the numeric value as a string. For text, the text value. Cannot be combined with 'values'.",
               "type": "string"
+            },
+            "values": {
+              "description": "Option names to filter on for multi-select fields. Matches issues that have ALL of these options set (AND semantics). To match any-of, make multiple list_issues calls. Cannot be combined with 'value'.",
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
             }
           },
           "required": [
-            "field_name",
-            "value"
+            "field_name"
           ],
           "type": "object"
         },

diff --git a/pkg/github/__toolsnaps__/list_issues_ff_fields_param.snap b/pkg/github/__toolsnaps__/list_issues_ff_fields_param.snap
@@ -20,21 +20,27 @@
         "type": "string"
       },
       "field_filters": {
-        "description": "Filter by custom issue field values. Each entry takes a field_name and a value; the server looks up the field and coerces the value to its type (single-select option name, text, number, or YYYY-MM-DD date).",
+        "description": "Filter by custom issue field values. Each entry takes a field_name and either 'value' (text, number, YYYY-MM-DD date, or single-select option name) or 'values' (multi-select option names). For multi-select fields, all listed values must be set on an issue for it to match (AND semantics) — to match any-of, make multiple list_issues calls and union the results.",
         "items": {
           "properties": {
             "field_name": {
               "description": "Name of the custom field (e.g. \"Priority\"). Case-insensitive.",
               "type": "string"
             },
             "value": {
-              "description": "Value to filter on. For single-select fields, the option name (e.g. \"P1\"). For dates, YYYY-MM-DD. For numbers, the numeric value as a string. For text, the text value.",
+              "description": "Value to filter on for text, number, date, or single-select fields. For single-select, the option name (e.g. \"P1\"). For dates, YYYY-MM-DD. For numbers, the numeric value as a string. For text, the text value. Cannot be combined with 'values'.",
               "type": "string"
+            },
+            "values": {
+              "description": "Option names to filter on for multi-select fields. Matches issues that have ALL of these options set (AND semantics). To match any-of, make multiple list_issues calls. Cannot be combined with 'value'.",
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
             }
           },
           "required": [
-            "field_name",
-            "value"
+            "field_name"
           ],
           "type": "object"
         },

@@ -10,7 +10,7 @@
   "inputSchema": {
     "properties": {
       "fields": {
-        "description": "Array of issue field values to set. Each element must have a 'field_id' (string, the GraphQL node ID of the field) and exactly one value field: 'text_value' for text fields, 'number_value' for number fields, 'date_value' (ISO 8601 date string) for date fields, or 'single_select_option_id' (the GraphQL node ID of the option) for single select fields. Set 'delete' to true to remove a field value.",
+        "description": "Array of issue field values to set. Each element must have a 'field_id' (string, the GraphQL node ID of the field) and exactly one value field: 'text_value' for text fields, 'number_value' for number fields, 'date_value' (ISO 8601 date string) for date fields, 'single_select_option_id' (the GraphQL node ID of the option) for single select fields, or 'multi_select_option_ids' (an array of GraphQL node IDs) for multi select fields. Set 'delete' to true to remove a field value.",
         "items": {
           "properties": {
             "confidence": {
@@ -38,6 +38,13 @@
               "description": "If true, this field value is sent to the API as a suggestion (suggest:true) rather than an applied value. Whether the value is applied or recorded as a proposal is determined by the API.",
               "type": "boolean"
             },
+            "multi_select_option_ids": {
+              "description": "The GraphQL node IDs of the options to set for a multi select field",
+              "items": {
+                "type": "string"
+              },
+              "type": "array"
+            },
             "number_value": {
               "description": "The value to set for a number field",
               "type": "number"

@@ -346,7 +346,7 @@ func Test_LegacyListIssues_Definition(t *testing.T) {
 // and variables list_issues issues for owner/repo with default parameters (no
 // labels, no since). They must stay in sync with the query built in
 // getIssueQueryType; see Test_ListIssues for the canonical copies.
-const listIssuesFieldsFieldValuesSelection = "issueFieldValues(first: 25){nodes{__typename,... on IssueFieldDateValue{field{... on IssueFieldDate{name,fullDatabaseId},... on IssueFieldNumber{name,fullDatabaseId},... on IssueFieldSingleSelect{name,fullDatabaseId},... on IssueFieldText{name,fullDatabaseId}},value},... on IssueFieldNumberValue{field{... on IssueFieldDate{name,fullDatabaseId},... on IssueFieldNumber{name,fullDatabaseId},... on IssueFieldSingleSelect{name,fullDatabaseId},... on IssueFieldText{name,fullDatabaseId}},valueNumber: value},... on IssueFieldSingleSelectValue{field{... on IssueFieldDate{name,fullDatabaseId},... on IssueFieldNumber{name,fullDatabaseId},... on IssueFieldSingleSelect{name,fullDatabaseId},... on IssueFieldText{name,fullDatabaseId}},value},... on IssueFieldTextValue{field{... on IssueFieldDate{name,fullDatabaseId},... on IssueFieldNumber{name,fullDatabaseId},... on IssueFieldSingleSelect{name,fullDatabaseId},... on IssueFieldText{name,fullDatabaseId}},value}}}"
+const listIssuesFieldsFieldValuesSelection = "issueFieldValues(first: 25){nodes{__typename,... on IssueFieldDateValue{field{... on IssueFieldDate{name,fullDatabaseId},... on IssueFieldNumber{name,fullDatabaseId},... on IssueFieldSingleSelect{name,fullDatabaseId},... on IssueFieldMultiSelect{name,fullDatabaseId},... on IssueFieldText{name,fullDatabaseId}},value},... on IssueFieldNumberValue{field{... on IssueFieldDate{name,fullDatabaseId},... on IssueFieldNumber{name,fullDatabaseId},... on IssueFieldSingleSelect{name,fullDatabaseId},... on IssueFieldMultiSelect{name,fullDatabaseId},... on IssueFieldText{name,fullDatabaseId}},valueNumber: value},... on IssueFieldSingleSelectValue{field{... on IssueFieldDate{name,fullDatabaseId},... on IssueFieldNumber{name,fullDatabaseId},... on IssueFieldSingleSelect{name,fullDatabaseId},... on IssueFieldMultiSelect{name,fullDatabaseId},... on IssueFieldText{name,fullDatabaseId}},value},... on IssueFieldMultiSelectValue{field{... on IssueFieldDate{name,fullDatabaseId},... on IssueFieldNumber{name,fullDatabaseId},... on IssueFieldSingleSelect{name,fullDatabaseId},... on IssueFieldMultiSelect{name,fullDatabaseId},... on IssueFieldText{name,fullDatabaseId}},options{name}},... on IssueFieldTextValue{field{... on IssueFieldDate{name,fullDatabaseId},... on IssueFieldNumber{name,fullDatabaseId},... on IssueFieldSingleSelect{name,fullDatabaseId},... on IssueFieldMultiSelect{name,fullDatabaseId},... on IssueFieldText{name,fullDatabaseId}},value}}}"
 
 const listIssuesFieldsQuery = "query($after:String$direction:OrderDirection!$first:Int!$issueFieldValues:[IssueFieldValueFilter!]!$orderBy:IssueOrderField!$owner:String!$repo:String!$states:[IssueState!]!){repository(owner: $owner, name: $repo){issues(first: $first, after: $after, states: $states, orderBy: {field: $orderBy, direction: $direction}, filterBy: {issueFieldValues: $issueFieldValues}){nodes{number,title,body,state,databaseId,author{login},createdAt,updatedAt,labels(first: 100){nodes{name,id,description}},comments{totalCount}," + listIssuesFieldsFieldValuesSelection + "},pageInfo{hasNextPage,hasPreviousPage,startCursor,endCursor},totalCount},isPrivate}}"