Cannot use Streamable HTTP MCP on Windows codex CLI (missing field command error) #4496

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1. bobobo-7

   added

   bugSomething isn't workingSomething isn't working

   on Sep 30, 2025
2. realyn commented on Oct 1, 2025

   

   realyn

   on Oct 1, 2025

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   same question
3. ignatremizov commented on Oct 1, 2025

   

   ignatremizov

   on Oct 1, 2025

   More actions

   Same here

   experimental_use_rmcp_client = true
   [mcp_servers.github]
   url  = "https://api.githubcopilot.com/mcp/"
   bearer_token = "ghp_ABC..."
   startup_timeout_sec = 20
   tool_timeout_sec = 90
   

   $ codex
   Error loading configuration: missing field `command`
   in `mcp_servers.github`
   
4. zpv commented on Oct 1, 2025

   

   zpv

   on Oct 1, 2025

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   Y'all need to use the alpha builds of Codex. 0.42.0 does not have the experimental client.

   npm install -g @openai/codex@0.43.0-alpha.10

   👍React with 👍1Reacted by Dennis Bücker
5. r-sniper commented on Oct 3, 2025

   

   r-sniper

   on Oct 3, 2025

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   Y'all need to use the alpha builds of Codex. 0.42.0 does not have the experimental client.

   npm install -g @openai/codex@0.43.0-alpha.10

   But its nowhere mentioned in doc, its only available in alpha release

   https://github.com/openai/codex/blob/main/docs/config.md#streamable-http

   👍React with 👍2Reacted by Ignat Remizov and Dennis Bücker
6. r-sniper commented on Oct 3, 2025

   

   r-sniper

   on Oct 3, 2025

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   Also, I switched to >_ OpenAI Codex (v0.43.0-alpha.18)

   Now the error goes away, but it says,

   
   🔌  MCP Tools
   
     • No MCP tools available.
   
7. jakeleventhal commented on Oct 3, 2025

   

   jakeleventhal

   on Oct 3, 2025

   More actions

   with 0.44.0 i still have issues
   when i run /mcp it says

     • Server: figma
       • URL: http://127.0.0.1:3845/mcp
       • Tools: (none)
   

   projects = { "/Users/jakeleventhal/Developer/rip-technologies" = { trust_level = "trusted" } }
   model = "gpt-5-codex"
   model_reasoning_effort = "high"
   
   [mcp_servers.linear]
   command = "npx"
   args = ["-y", "mcp-remote", "https://mcp.linear.app/sse"]
   
   experimental_use_rmcp_client = true
   [mcp_servers.figma]
   url = "http://127.0.0.1:3845/mcp"

   cant get it to work with the remote figma mcp either
8. hkfires commented on Oct 5, 2025

   

   hkfires

   on Oct 5, 2025

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   with 0.44.0 i still have issues when i run /mcp it says

     • Server: figma
       • URL: http://127.0.0.1:3845/mcp
       • Tools: (none)
   

   projects = { "/Users/jakeleventhal/Developer/rip-technologies" = { trust_level = "trusted" } }
   model = "gpt-5-codex"
   model_reasoning_effort = "high"

   [mcp_servers.linear]
   command = "npx"
   args = ["-y", "mcp-remote", "https://mcp.linear.app/sse"]

   experimental_use_rmcp_client = true
   [mcp_servers.figma]
   url = "http://127.0.0.1:3845/mcp"
   cant get it to work with the remote figma mcp either

   You should move the experimental_use_rmcp_client = true to the top level, for example

   projects = { "/Users/jakeleventhal/Developer/rip-technologies" = { trust_level = "trusted" } }
   model = "gpt-5-codex"
   model_reasoning_effort = "high"
   experimental_use_rmcp_client = true
   
   [mcp_servers.linear]
   command = "npx"
   args = ["-y", "mcp-remote", "https://mcp.linear.app/sse"]
   
   [mcp_servers.figma]
   url = "http://127.0.0.1:3845/mcp"
   
9. jakeleventhal commented on Oct 5, 2025

   

   jakeleventhal

   on Oct 5, 2025

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   great that worked @hkfires, now just waiting on the ability to auth (like with the remote figma MCP)
10. aibrahim-oai

    assigned

    gpeal

    on Oct 6, 2025
11. gpeal commented on Oct 6, 2025

    

    gpeal

    on Oct 6, 2025

    Contributor

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    0.45.0-alpha.6 now supports streamable http with oauth. Run codex mcp login figma with the alpa or wait for the final release which should be out in the next day or two.
12. gpeal

    closed this as completedon Oct 6, 2025