[Error]: 400 No tool output found for function

This happens to me any time I interrupt Codex while it is waiting for the response from a tool call. Forces a restart of the CLI.

Check if you see "Rate limit reached" errors in your OpenAI logs and if so, this recently merged PR should fix the issue: https://github.com/openai/codex/pull/611

Thats right, I got this error message in logs

I'm still having this issue. I've had it twice now (today). What I've observed was in both cases, the conversation had dropped below 50% context left, with both failing at 48% context. Is this possibly related to conversation handling?

I am getting this for every codex prompt. it is consuming input tokens but I get nothing back :(

!Image

I am also getting this issue using o3

Getting this mostly when Codex thinks for >300s.

file:///opt/homebrew/lib/node_modules/@openai/codex/dist/cli.js:473
`),IS.set(this,void 0),o9.set(this,void 0),wS.set(this,"-".repeat(2)),Vg.set(this,new TextEncoder),RS.set(this,void 0),NS.set(this,void 0),s9.set(this,void 0),!mse(t))throw new TypeError("Expected first argument to be a FormData instance.");let a;if(R7(r)?n=r:a=r,a||(a=fse()),typeof a!="string")throw new TypeError("Expected boundary argument to be a string.");if(n&&!R7(n))throw new TypeError("Expected options argument to be an object.");TS(this,NS,t,"f"),TS(this,s9,{...mke,...n},"f"),TS(this,IS,ba(this,Vg,"f").encode(ba(this,Rf,"f")),"f"),TS(this,o9,ba(this,IS,"f").byteLength,"f"),this.boundary=`form-data-boundary-${a}`,this.contentType=`multipart/form-data; boundary=${this.boundary}`,TS(this,RS,ba(this,Vg,"f").encode(`${ba(this,wS,"f")}${this.boundary}${ba(this,wS,"f")}${ba(this,Rf,"f").repeat(2)}`),"f"),this.contentLength=String(this.getContentLength()),this.headers=Object.freeze({"Content-Type":this.contentType,"Content-Length":this.contentLength}),Object.defineProperties(this,{boundary:{writable:!1,configurable:!1},contentType:{writable:!1,configurable:!1},contentLength:{writable:!1,configurable:!1},headers:{writable:!1,configurable:!1}})}getContentLength(){let t=0;for(let[r,n]of ba(this,NS,"f")){let a=qg(n)?n:ba(this,Vg,"f").encode(N7(n));t+=ba(this,i9,"m",O7).call(this,r,a).byteLength,t+=qg(a)?a.size:a.byteLength,t+=ba(this,o9,"f")}return t+ba(this,RS,"f").byteLength}*values(){for(let[t,r]of ba(this,NS,"f").entries()){let n=qg(r)?r:ba(this,Vg,"f").encode(N7(r));yield ba(this,i9,"m",O7).call(this,t,n),yield n,yield ba(this,IS,"f")}yield ba(this,RS,"f")}async*encode(){for(let t of this.values())qg(t)?yield*t.stream():yield t}[(Rf=new WeakMap,IS=new WeakMap,o9=new WeakMap,wS=new WeakMap,Vg=new WeakMap,RS=new WeakMap,NS=new WeakMap,s9=new WeakMap,i9=new WeakSet,O7=function(r,n){let a="";return a+=`${ba(this,wS,"f")}${this.boundary}${ba(this,Rf,"f")}`,a+=`Content-Disposition: form-data; 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Please report this error.`)}if(typeof TextDecoder<"u"){if(t instanceof Uint8Array||t instanceof ArrayBuffer)return this.textDecoder??(this.textDecoder=new TextDecoder("utf8")),this.textDecoder.decode(t);throw new qt(`Unexpected: received non-Uint8Array/ArrayBuffer (${t.constructor.name}) in a web platform. Please report this error.`)}throw new qt("Unexpected: neither Buffer nor TextDecoder are available as globals. 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w0 [Error]: 400 No tool output found for function call call_Kncg8sIzOLIqGu7iqfacHKo7.
    at e.generate (file:///opt/homebrew/lib/node_modules/@openai/codex/dist/cli.js:473:4010)
    at Rr.makeStatusError (file:///opt/homebrew/lib/node_modules/@openai/codex/dist/cli.js:477:7623)
    at Rr.makeRequest (file:///opt/homebrew/lib/node_modules/@openai/codex/dist/cli.js:477:8555)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async fE.run (file:///opt/homebrew/lib/node_modules/@openai/codex/dist/cli.js:493:198) {
  status: 400,
  headers: {
    'alt-svc': 'h3=":443"; ma=86400',
    'cf-cache-status': 'DYNAMIC',
    'cf-ray': '938f4b002f098958-SIN',
    connection: 'keep-alive',
    'content-length': '184',
    'content-type': 'application/json',
    date: 'Thu, 01 May 2025 12:31:01 GMT',
    'openai-organization': 'REMOVED,
    'openai-processing-ms': '4760',
    'openai-version': '2020-10-01',
    server: 'cloudflare',
    'set-cookie': '__cf_bm=XXX; path=/; expires=Thu, 01-May-25 13:01:01 GMT; domain=.api.openai.com; HttpOnly; Secure; SameSite=None, _cfuvid=XXX; path=/; domain=.api.openai.com; HttpOnly; Secure; SameSite=None',
    'strict-transport-security': 'max-age=31536000; includeSubDomains; preload',
    'x-content-type-options': 'nosniff',
    'x-request-id': 'req_806367bab6c7bc3d82039f046106d0d7'
  },
  request_id: 'req_806367bab6c7bc3d82039f046106d0d7',
  error: {
    message: 'No tool output found for function call call_Kncg8sIzOLIqGu7iqfacHKo7.',
    type: 'invalid_request_error',
    param: 'input',
    code: null
  },
  code: null,
  param: 'input',
  type: 'invalid_request_error'
}

Thank you for the feedback! Please try using the latest version of Codex CLI to see if the issue persists. If it does, feel free to report back.