fix: MCP COS 工具发现与调用机制存在缺陷

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Attribution issue

• issueId: issue_mo8xdkmq_6owy7e
• category: tool
• canonicalTitle: MCP COS 工具发现与调用机制存在缺陷
• representativeRun: atomic-js-cloudbase-chain-storage-upload-helloworld-and-poll/2026-04-21T17-55-35-ifqpo4

Automation summary

SUMMARY:
root_cause: ATTRIBUTION_MISMATCH. The issue title "MCP COS 工具发现与调用机制存在缺陷" does not accurately describe the actual failure.
The failed check shows: "internal evaluation artifact 不存在" with error "internal evaluation artifact 不存在" - the agent failed to produce any output because it returned a model API error "400 invalid parameter value" before any tool call was attempted.
The trace shows:

1. User requested COS upload task via MCP tools
2. Assistant immediately returned: "400 invalid parameter value (167a0f5cf0a856ff5e5cfb714e80c3c0/92557a2b-1965-48e4-9d99-b45a1fb615cc)"
3. Zero tool calls were made
4. Error source: [EXECUTION_ERROR] model API returned 400 error before any tool call
   This is a model-level request validation error, not a COS tool discovery or invocation defect. The model rejected the request entirely before attempting to invoke any tools. The canonical title implies a problem with COS tool discovery/invocation mechanisms in the MCP server code, but the actual failure is at the model API layer.
   changes: None - this is not a fixable product defect in the CloudBase-MCP repository.
   validation: N/A - no product code changes made.
   follow_up: ATTRIBUTION_MISMATCH:
   (a) Represe

Changed files

• mcp/package-lock.json
• mcp/package.json

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Attribution post-PR evaluation

• visibility: internal identifiers, run ids, and private links are intentionally omitted
• attempt: 1
• eval_scope: primary_only
• overall: FAILED
• summary: at least one planned evaluation case failed
• updated_at: 2026-04-28T22:27:10.763Z

Cases

• [FAILED] — primary — evaluation failed