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Run the client’s sign-in: /mcp then Authenticate in Claude Code, codex mcp login fincept in Codex, the login action in Cursor or VS Code MCP settings.
The account you signed in with has no active Exclusive Pro plan. Check it at fincept.in/enterprise/account, or sign in with the account that has it.
Your plan changed or lapsed after you connected. Renew or upgrade, then retry; there is no need to sign in again.
The connection was ended: a password change, a refresh token used twice, or more than 20 connections on the account. Sign in again from the client.
codex mcp add signs you in already. Running codex mcp login straight after starts a second sign-in. Both work; Codex keeps the second.
Windows PowerShell 5.1 does not support &&. Run each command on its own line, or use ;.
Only the core set is listed. Ask the agent to use fincept_search_tools, or name the tool. A name the catalog does not have returns unknown tool.
The result was too large to send whole. The agent reads the rest with fincept_read_result, or open artifacts[0].view_url in the browser. See large results.
The message names the argument at fault. Common causes: series of different lengths in one table, too few observations for the model, a formula or column name the table lacks, asset weights or bounds that cannot be met, or a $fincept path that does not exist in the referenced tool’s data.
The account passed 120 requests per minute. Clients back off and retry; agents that loop over many symbols should use batch tools such as market_get_quotes.
Error codes are listed in the errors reference.