Integrate tools with an LLM agent

[HarshSonaiya]

I'm trying to use the MCP server to enable LLM-based querying of JIRA projects, but I'm encountering consistent failures with tool calls—both when invoked through the LLM and directly via the MCP client.

Has anyone experienced similar behavior or have insights into possible causes?

Here are some recurring issues:

Authorization error: The tool fails with a "Not authorized to perform write operation" message, even though the same operation succeeds using the JIRA Python library with identical credentials.

Output format mismatch: The tool returns a JSON representation of a list when executed, but during tool registration/binding, the expected output format is defined as a JSON dictionary.

Any suggestions or pointers would be greatly appreciated.