Cause (Documented platform behavior): The model cannot safely choose between identically named tools, so the SDK rejects duplicates unless server-prefixed names are enabled.
Fix status: documented_behavior
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/openai/openai-agents-js/fdaf0a66ca6e9d89498909ad7cf64745630e8afb/packages/agents-core/src/mcp.ts (official_docs, unknown, documented_behavior): getAllMcpTools throws UserError with the duplicate names.
- https://raw.githubusercontent.com/openai/openai-agents-js/fdaf0a66ca6e9d89498909ad7cf64745630e8afb/docs/src/content/docs/guides/mcp.mdx (official_docs, unknown, documented_behavior): Docs: same-named tools from two local MCP servers raise a duplicate tool name error; opt in with mcpConfig.includeServerInToolNames: true.
Search phrasings: openai agents duplicate tool names across MCP servers; includeServerInToolNames openai agents js; two mcp servers same tool name agents sdk
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Run fails with UserError listing the colliding tool names when tools are gathered from MCP servers.
- Context
- Product: OpenAI Agents SDK (JavaScript/TypeScript) Component: @openai/agents-core MCP tool listing Operation: Agent with multiple mcpServers exposing the same tool name Affected versions: observed in @openai/agents source at version 0.18.0; introduction version unknown Environment: unknown Exception: UserError Packages: @openai/agents source at 0.18.0 (main fdaf0a6) Trigger: Two local MCP servers publish tools with identical names.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Duplicate tool names found across MCP servers:
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [OpenAI Agents JS] 'Duplicate tool names found across MCP servers' when two MCP servers expose the same tool
Recommended action: Set mcpConfig.includeServerInToolNames: true on the agent to expose deterministic server-prefixed names, or filter tools per server.
Option: Enable server-prefixed tool names [evidence: official_recommended_action]
Steps:
1. agent: new Agent({ ..., mcpConfig: { includeServerInToolNames: true } })
Expected: Tools become unique per server
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 9368161c-08e5-40a6-b828-bf1927fe965e
- Proposed action
- Recommended action: Set mcpConfig.includeServerInToolNames: true on the agent to expose deterministic server-prefixed names, or filter tools per server. Option: Enable server-prefixed tool names [evidence: official_recommended_action] Steps: 1. agent: new Agent({ ..., mcpConfig: { includeServerInToolNames: true } }) Expected: Tools become unique per server
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.