---

This section details on the original issue you should resolve

<issue_title>list_project_fields fails with JSON unmarshal error for single_select fields with options</issue_title>
<issue_description>## Bug Description

Thelist_project_fields tool fails when trying to retrieve project fields that includesingle_select fields with options (e.g., Status, Priority, Size fields). I found this when creating a custom agent that has been granted the ability to create/update issues and move them around a project board by changing the status.

Error Message

failed to list project fields: json: cannot unmarshal object into Go struct field ProjectV2FieldOption.options.name of type string

Steps to Reproduce

1. Create or use a GitHub Project (v2) that has a single_select field with options (e.g., Status field with Backlog, In Progress, Done, etc.)

2. Calllist_project_fields tool with the project details:

   owner_type: "user"owner: "<username>"project_number: <project_number>

3. Observe the JSON unmarshal error

Expected Behavior

The tool should successfully return all project fields, including single_select fields with their options listed.

Actual Behavior

The tool fails with a JSON unmarshal error because it's trying to unmarshal the options structure incorrectly.

Root Cause

The GitHub GraphQL API returns options for single_select fields as an array of objects with this structure:

{"options": [    {"id":"aeba538c","name":"Backlog"    },    {"id":"f75ad846","name":"Ready"    }  ]}

However, the Go struct appears to be expectingoptions.name to be a simple string type instead of an object withid andname properties.

Workaround

Until this is fixed, I have been using the GitHub GraphQL API directly to retrieve field information and placing the result in the agent definition so that the agent does not need to call thelist_project_fields tool:

query {user(login:"username") {projectV2(number:4) {fields(first:20) {nodes {...onProjectV2Field {idnamedataTypedatabaseId          }...onProjectV2SingleSelectField {idnamedataTypedatabaseIdoptions {idname            }          }        }      }    }  }}

Suggested Fix

Update the Go struct definition forProjectV2FieldOption to properly handle the options structure where each option is an object containingid andname fields, rather than expecting a simple string.

Environment

• GitHub MCP Server version: [latest as of November 2025]
• Affected tool:list_project_fields
• I get the same error when I test locally in VS CODE and using the Coding Agent in GitHub with the same agent definition.
  </issue_description>

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