Update create_or_update_file SHA Arg Description (github#651)

* sha arg prompt as required if updating file

* generate docs and toolsnaps

* shorten

Author: LuluBeatson

README.md

@@ -870,7 +870,7 @@ export GITHUB_MCP_TOOL_ADD_ISSUE_COMMENT_DESCRIPTION="an alternative description
   - `owner`: Repository owner (username or organization) (string, required)
   - `path`: Path where to create/update the file (string, required)
   - `repo`: Repository name (string, required)
-  - `sha`: SHA of file being replaced (for updates) (string, optional)
+  - `sha`: Required if updating an existing file. The blob SHA of the file being replaced. (string, optional)
 
 - **create_repository** - Create repository
   - `autoInit`: Initialize with README (boolean, optional)

pkg/github/__toolsnaps__/create_or_update_file.snap

@@ -31,7 +31,7 @@
         "type": "string"
       },
       "sha": {
-        "description": "SHA of file being replaced (for updates)",
+        "description": "Required if updating an existing file. The blob SHA of the file being replaced.",
         "type": "string"
       }
     },

pkg/github/repositories.go

@@ -288,7 +288,7 @@ func CreateOrUpdateFile(getClient GetClientFn, t translations.TranslationHelperF
 				mcp.Description("Branch to create/update the file in"),
 			),
 			mcp.WithString("sha",
-				mcp.Description("SHA of file being replaced (for updates)"),
+				mcp.Description("Required if updating an existing file. The blob SHA of the file being replaced."),
 			),
 		),
 		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {