Fixed in 0.11.1
Version 0.11.1 has been released and contains the fix.
The error
MCP error -32602: Input validation error: Invalid arguments for tool add_issueReported in nulab/backlog-mcp-server issue #118: “Cannot set string values for custom fields when creating an issue via addIssue tool”.
What fixed it
Version 0.11.1 is out now, so you can see the fix.
— a maintainer's comment on the issue. The fix ships in 0.11.1; upgrade to it or later.
Source and dates
| Repository | nulab/backlog-mcp-server |
|---|---|
| Issue | Cannot set string values for custom fields when creating an issue via addIssue tool |
| Evidence | a maintainer's comment |
| Status | Fixed (per the evidence) |
| Fixed in | 0.11.1 (the version is named in the quote) |
| Issue closed | 2026-05-25 |
| Read from GitHub | 2026-11-07 |
| Approved by a person | 2026-11-07 |
This page records what the vendor's own GitHub repository says. The error text, the issue title and the quote are copied as written; the summary at the top is one sentence limited to the quote, and a person approved this fact on 2026-11-07. KanseiLink has not re-run the fix. Read the issue before applying it. Something changed? Write to contact@synapse-arrows.com.
For AI agents
The same fact is returned as issue_facts by lookup({ service_id: 'backlog' }) on the KanseiLink MCP server (https://mcp.kansei-link.com/mcp), next to the other checked facts for Backlog. Connection guide: Backlog service page.