Custom Role Name support

[ozgur-yalcin]

Service

OpenAI

Describe the bug

curl -v --location "https://api.mistral.ai/v1/chat/completions" \
     --header "Authorization: Bearer $MISTRAL_API_KEY" \
     --header "Content-Type: application/json" \
     --data '{
    "model": "mistral-large-latest",
    "messages": [
     {
        "role": "User",
        "content": "Merhaba"
      }
    ]
  }'
* Host api.mistral.ai:443 was resolved.
* IPv6: (none)
* IPv4: 104.18.22.152, 104.18.23.152
*   Trying 104.18.22.152:443...
* Connected to api.mistral.ai (104.18.22.152) port 443
* ALPN: curl offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
*  CAfile: /opt/anaconda3/ssl/cacert.pem
*  CApath: none
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384 / X25519 / id-ecPublicKey
* ALPN: server accepted h2
* Server certificate:
*  subject: CN=api.mistral.ai
*  start date: Mar  9 02:33:22 2025 GMT
*  expire date: Jun  7 03:33:21 2025 GMT
*  subjectAltName: host "api.mistral.ai" matched cert's "api.mistral.ai"
*  issuer: C=US; O=Google Trust Services; CN=WE1
*  SSL certificate verify ok.
*   Certificate level 0: Public key type EC/prime256v1 (256/128 Bits/secBits), signed using ecdsa-with-SHA256
*   Certificate level 1: Public key type EC/prime256v1 (256/128 Bits/secBits), signed using ecdsa-with-SHA384
*   Certificate level 2: Public key type EC/secp384r1 (384/192 Bits/secBits), signed using ecdsa-with-SHA384
* using HTTP/2
* [HTTP/2] [1] OPENED stream for https://api.mistral.ai/v1/chat/completions
* [HTTP/2] [1] [:method: POST]
* [HTTP/2] [1] [:scheme: https]
* [HTTP/2] [1] [:authority: api.mistral.ai]
* [HTTP/2] [1] [:path: /v1/chat/completions]
* [HTTP/2] [1] [user-agent: curl/8.9.1]
* [HTTP/2] [1] [accept: */*]
* [HTTP/2] [1] [authorization: Bearer $MISTRAL_API_KEY]
* [HTTP/2] [1] [content-type: application/json]
* [HTTP/2] [1] [content-length: 134]
> POST /v1/chat/completions HTTP/2
> Host: api.mistral.ai
> User-Agent: curl/8.9.1
> Accept: */*
> Authorization: Bearer $MISTRAL_API_KEY
> Content-Type: application/json
> Content-Length: 134
> 
* upload completely sent off: 134 bytes
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
< HTTP/2 422 
< date: Wed, 26 Mar 2025 13:32:55 GMT
< content-type: application/json
< content-length: 464
< ratelimitbysize-query-cost: 32001
< ratelimitbysize-limit: 500000
< x-ratelimitbysize-limit-month: 1000000000
< x-ratelimitbysize-remaining-month: 999967999
< ratelimitbysize-reset: 5
< x-ratelimitbysize-limit-minute: 500000
< x-ratelimitbysize-remaining-minute: 467999
< ratelimitbysize-remaining: 467999
< x-envoy-upstream-service-time: 4
< access-control-allow-origin: *
< x-kong-upstream-latency: 4
< x-kong-proxy-latency: 6
< x-kong-request-id: 3658e2145174f8454533073c7004bc28
< cf-cache-status: DYNAMIC
< set-cookie: __cf_bm=0s_i_nZR8tzptGqAN.OSHoKIieFXoKjRPSCVATgxnyo-1742995975-1.0.1.1-4g638dE7G1uV.AnGzci9brVI8aTc8EakbgXQHZhm3YD5.lZVBP2uXK5OgGyYAHMJQvmSpUBi27hLguSeGL95LrGXkWXh3bx8OS1PebPXP38; path=/; expires=Wed, 26-Mar-25 14:02:55 GMT; domain=.mistral.ai; HttpOnly; Secure; SameSite=None
< server: cloudflare
< cf-ray: 9267044c2c9e0638-CDG
< alt-svc: h3=":443"; ma=86400
< 
* Connection #0 to host api.mistral.ai left intact
{"detail":[{"type":"union_tag_invalid","loc":["body","messages",0],"msg":"Input tag 'User' found using 'role' does not match any of the expected tags: <Roles.system: 'system'>, <Roles.user: 'user'>, <Roles.assistant: 'assistant'>, <Roles.tool: 'tool'>","input":{"role":"User","content":"Merhaba"},"ctx":{"discriminator":"'role'","tag":"User","expected_tags":"<Roles.system: 'system'>, <Roles.user: 'user'>, <Roles.assistant: 'assistant'>, <Roles.tool: 'tool'>"}}]}%

Steps to reproduce

curl -v --location "https://api.mistral.ai/v1/chat/completions" \
     --header "Authorization: Bearer $MISTRAL_API_KEY" \
     --header "Content-Type: application/json" \
     --data '{
    "model": "mistral-large-latest",
    "messages": [
     {
        "role": "user",
        "content": "Merhaba"
      }
    ]
  }'
* Host api.mistral.ai:443 was resolved.
* IPv6: (none)
* IPv4: 104.18.23.152, 104.18.22.152
*   Trying 104.18.23.152:443...
* Connected to api.mistral.ai (104.18.23.152) port 443
* ALPN: curl offers h2,http/1.1
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
*  CAfile: /opt/anaconda3/ssl/cacert.pem
*  CApath: none
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384 / X25519 / id-ecPublicKey
* ALPN: server accepted h2
* Server certificate:
*  subject: CN=api.mistral.ai
*  start date: Mar  9 02:33:22 2025 GMT
*  expire date: Jun  7 03:33:21 2025 GMT
*  subjectAltName: host "api.mistral.ai" matched cert's "api.mistral.ai"
*  issuer: C=US; O=Google Trust Services; CN=WE1
*  SSL certificate verify ok.
*   Certificate level 0: Public key type EC/prime256v1 (256/128 Bits/secBits), signed using ecdsa-with-SHA256
*   Certificate level 1: Public key type EC/prime256v1 (256/128 Bits/secBits), signed using ecdsa-with-SHA384
*   Certificate level 2: Public key type EC/secp384r1 (384/192 Bits/secBits), signed using ecdsa-with-SHA384
* using HTTP/2
* [HTTP/2] [1] OPENED stream for https://api.mistral.ai/v1/chat/completions
* [HTTP/2] [1] [:method: POST]
* [HTTP/2] [1] [:scheme: https]
* [HTTP/2] [1] [:authority: api.mistral.ai]
* [HTTP/2] [1] [:path: /v1/chat/completions]
* [HTTP/2] [1] [user-agent: curl/8.9.1]
* [HTTP/2] [1] [accept: */*]
* [HTTP/2] [1] [authorization: Bearer $MISTRAL_API_KEY]
* [HTTP/2] [1] [content-type: application/json]
* [HTTP/2] [1] [content-length: 134]
> POST /v1/chat/completions HTTP/2
> Host: api.mistral.ai
> User-Agent: curl/8.9.1
> Accept: */*
> Authorization: Bearer $MISTRAL_API_KEY
> Content-Type: application/json
> Content-Length: 134
> 
* upload completely sent off: 134 bytes
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
< HTTP/2 200 
< date: Wed, 26 Mar 2025 13:32:50 GMT
< content-type: application/json
< content-length: 336
< ratelimitbysize-query-cost: 32001
< ratelimitbysize-reset: 11
< x-ratelimitbysize-limit-minute: 500000
< x-ratelimitbysize-remaining-minute: 467999
< ratelimitbysize-limit: 500000
< x-ratelimitbysize-limit-month: 1000000000
< x-ratelimitbysize-remaining-month: 999967999
< ratelimitbysize-remaining: 467999
< x-envoy-upstream-service-time: 521
< access-control-allow-origin: *
< x-kong-upstream-latency: 522
< x-kong-proxy-latency: 8
< x-kong-request-id: 3b35707db531013f718ff538102e1223
< cf-cache-status: DYNAMIC
< set-cookie: __cf_bm=OgS8M7UcZU.EuNdG1dsj9kkjGXsSRBbI40BIPOMY6F0-1742995970-1.0.1.1-IS__tVVxAKRbaYWFKh1MPvHk5LPw0HT9P.apt.nIEJTZbs8LdggFjY0mn84jSfP04bfK2qMvBBvLU47R6wKBqhJjFEi3j1jZCG6A01dov5Y; path=/; expires=Wed, 26-Mar-25 14:02:50 GMT; domain=.mistral.ai; HttpOnly; Secure; SameSite=None
< server: cloudflare
< cf-ray: 92670428d986d151-CDG
< alt-svc: h3=":443"; ma=86400
< 
* Connection #0 to host api.mistral.ai left intact
{"id":"f96633569843443baf81fce524ab3699","object":"chat.completion","created":1742995969,"model":"mistral-large-latest","choices":[{"index":0,"message":{"role":"assistant","tool_calls":null,"content":"Merhaba! Nasıl yardımcı olabilirim?"},"finish_reason":"stop"}],"usage":{"prompt_tokens":6,"total_tokens":22,"completion_tokens":16}}

Code snippets

There are SystemChatMessage, AssistantChatMessage, UserChatMessage etc. but non-standard role names can be used as in the mistral ai example.
I need a class named like CustomChatMessage and we can define custom role name as string

OS

macOS

.NET version

8

Library version

2.1.0

[joseharriaga]

Thank you for reaching out, @ozgur-yalcin ! Is the difference here that one role is "User" versus "user"?