fix: EU region frontend authentication#88
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Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
URL-based tools (get_sheet_by_url, search_in_sheet_by_url, what_am_i_assigned_to_by_sheet_url) now detect whether the frontend URL points to the EU or US region and validate it against the configured SMARTSHEET_ENDPOINT. A region mismatch returns a clear, actionable error instead of an opaque auth failure. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
This was referenced Apr 18, 2026
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Summary
app.smartsheet.comvsapp.smartsheet.eu)SMARTSHEET_ENDPOINTregion before making API callsProblem
When EU region users pass
app.smartsheet.euURLs to URL-based tools (get_sheet_by_url,search_in_sheet_by_url,what_am_i_assigned_to_by_sheet_url), the tools extract the directIdToken but send it to whicheverSMARTSHEET_ENDPOINTis configured. If the endpoint is US but the sheet is EU (or vice versa), authentication fails silently because Smartsheet API keys are region-specific.The
claude_desktop_config-example.jsonalso omittedSMARTSHEET_ENDPOINTentirely, making misconfiguration very likely.Changes
src/utils/url-utils.tsparseSmartsheetUrl()extracts directIdToken + detects region from hostname;detectApiRegion()determines region from API base URL;validateRegionMatch()returns actionable error on mismatchsrc/apis/smartsheet-api.tspublic readonly region: SmartsheetRegionderived fromSMARTSHEET_ENDPOINTsrc/tools/smartsheet-sheet-tools.tsget_sheet_by_urlusesparseSmartsheetUrl()+validateRegionMatch()src/tools/smartsheet-search-tools.tssearch_in_sheet_by_urlandwhat_am_i_assigned_to_by_sheet_urlclaude_desktop_config-example.jsonSMARTSHEET_ENDPOINTto env config.env.exampleTest plan
"Region mismatch: the Smartsheet URL points to the EU region, but your SMARTSHEET_ENDPOINT is configured for the US region. Set SMARTSHEET_ENDPOINT to https://api.smartsheet.eu/2.0 and use a EU API token."npm run build)