feat!: reject unrecognized model_config settings and bump coder/coder to latest main

docs/resources/agents_model.md

@@ -44,9 +44,12 @@ resource "coderd_agents_model" "sonnet" {
       input_price_per_million_tokens  = "3"
       output_price_per_million_tokens = "15"
     }
+    reasoning_effort = {
+      default = "high"
+      max     = "high"
+    }
     provider_options = {
       anthropic = {
-        effort   = "high"
         thinking = { budget_tokens = 4096 }
       }
     }

examples/resources/coderd_agents_model/resource.tf

@@ -26,9 +26,12 @@ resource "coderd_agents_model" "sonnet" {
       input_price_per_million_tokens  = "3"
       output_price_per_million_tokens = "15"
     }
+    reasoning_effort = {
+      default = "high"
+      max     = "high"
+    }
     provider_options = {
       anthropic = {
-        effort   = "high"
         thinking = { budget_tokens = 4096 }
       }
     }

go.mod

@@ -4,7 +4,7 @@ go 1.26.4
 
 require (
 	cdr.dev/slog/v3 v3.1.0
-	github.com/coder/coder/v2 v2.34.0-rc.0.0.20260701204415-db7f4438b4ad
+	github.com/coder/coder/v2 v2.34.0-rc.0.0.20260713111656-06107768a8d6
 	github.com/coder/retry v1.5.1
 	github.com/coder/serpent v0.15.0
 	github.com/coder/websocket v1.8.15
@@ -53,8 +53,9 @@ require (
 	github.com/acarl005/stripansi v0.0.0-20180116102854-5a71ef0e047d // indirect
 	github.com/agext/levenshtein v1.2.3 // indirect
 	github.com/apparentlymart/go-textseg/v15 v15.0.0 // indirect
+	github.com/apparentlymart/go-textseg/v17 v17.0.1 // indirect
 	github.com/armon/go-radix v1.0.1-0.20221118154546-54df44f2176c // indirect
-	github.com/aws/aws-sdk-go-v2 v1.42.0 // indirect
+	github.com/aws/aws-sdk-go-v2 v1.42.1 // indirect
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
 	github.com/aymerick/douceur v0.2.0 // indirect
 	github.com/bahlo/generic-list-go v0.2.0 // indirect
@@ -86,7 +87,7 @@ require (
 	github.com/ebitengine/purego v0.10.1 // indirect
 	github.com/fatih/color v1.19.0 // indirect
 	github.com/felixge/httpsnoop v1.1.0 // indirect
-	github.com/go-chi/chi/v5 v5.2.4 // indirect
+	github.com/go-chi/chi/v5 v5.3.1 // indirect
 	github.com/go-jose/go-jose/v4 v4.1.4 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
@@ -121,7 +122,7 @@ require (
 	github.com/imdario/mergo v0.3.16 // indirect
 	github.com/invopop/jsonschema v0.14.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/compress v1.18.6 // indirect
+	github.com/klauspost/compress v1.19.0 // indirect
 	github.com/lucasb-eyer/go-colorful v1.4.0 // indirect
 	github.com/lufia/plan9stats v0.0.0-20250317134145-8bc96cf8fc35 // indirect
 	github.com/magiconair/properties v1.8.10 // indirect
@@ -188,7 +189,7 @@ require (
 	github.com/yuin/goldmark v1.8.2 // indirect
 	github.com/yuin/goldmark-meta v1.1.0 // indirect
 	github.com/yusufpapurcu/wmi v1.2.4 // indirect
-	github.com/zclconf/go-cty v1.18.1 // indirect
+	github.com/zclconf/go-cty v1.19.0 // indirect
 	github.com/zeebo/errs v1.4.0 // indirect
 	go.abhg.dev/goldmark/frontmatter v0.2.0 // indirect
 	go.nhat.io/otelsql v0.16.0 // indirect
@@ -217,14 +218,14 @@ require (
 	golang.org/x/sync v0.21.0 // indirect
 	golang.org/x/sys v0.46.0 // indirect
 	golang.org/x/term v0.44.0 // indirect
-	golang.org/x/text v0.38.0 // indirect
+	golang.org/x/text v0.39.0 // indirect
 	golang.org/x/time v0.15.0 // indirect
 	golang.org/x/tools v0.47.0 // indirect
 	golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da // indirect
 	google.golang.org/appengine v1.6.8 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20260610212136-7ab31c22f7ad // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20260610212136-7ab31c22f7ad // indirect
-	google.golang.org/grpc v1.81.1 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260622175928-b703f567277d // indirect
+	google.golang.org/grpc v1.82.0 // indirect
 	google.golang.org/protobuf v1.36.11 // indirect
 	gopkg.in/DataDog/dd-trace-go.v1 v1.74.0 // indirect
 	gopkg.in/ini.v1 v1.67.3 // indirect

go.sum

@@ -76,10 +76,12 @@ github.com/andybalholm/brotli v1.2.1/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUS
 github.com/apparentlymart/go-textseg/v12 v12.0.0/go.mod h1:S/4uRK2UtaQttw1GenVJEynmyUenKwP++x/+DdGV/Ec=
 github.com/apparentlymart/go-textseg/v15 v15.0.0 h1:uYvfpb3DyLSCGWnctWKGj857c6ew1u1fNQOlOtuGxQY=
 github.com/apparentlymart/go-textseg/v15 v15.0.0/go.mod h1:K8XmNZdhEBkdlyDdvbmmsvpAG721bKi0joRfFdHIWJ4=
+github.com/apparentlymart/go-textseg/v17 v17.0.1 h1:bpMXRgQ5cEoRNuQke1a80/Nl6w3G5eoIbWo9f3gXkAs=
+github.com/apparentlymart/go-textseg/v17 v17.0.1/go.mod h1:fa8X4jgGeevslICIY6LcdjkSecWnXmYd9Lk34z/VxZs=
 github.com/armon/go-radix v1.0.1-0.20221118154546-54df44f2176c h1:651/eoCRnQ7YtSjAnSzRucrJz+3iGEFt+ysraELS81M=
 github.com/armon/go-radix v1.0.1-0.20221118154546-54df44f2176c/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
-github.com/aws/aws-sdk-go-v2 v1.42.0 h1:XvXMJTkFQtpBKIWZnmr9ZEOc2InWM2yldjXEJ/bymhA=
-github.com/aws/aws-sdk-go-v2 v1.42.0/go.mod h1:27+ACypSLljLAEKsCYOmrjKh83vuTRkuAe9Uv/3A4bg=
+github.com/aws/aws-sdk-go-v2 v1.42.1 h1:9eOTgu1z/dVtYpNZ3/8/XbbaX0x/BqE3HUzAzs6K0ek=
+github.com/aws/aws-sdk-go-v2 v1.42.1/go.mod h1:5pKeft2eJj+gElQ38Jqg4ibCqh+/AK33/0X3hip7IjM=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
 github.com/aymerick/douceur v0.2.0 h1:Mv+mAeH1Q+n9Fr+oyamOlAkUNPWPlA8PPGR0QAaYuPk=
@@ -125,8 +127,8 @@ github.com/clipperhouse/uax29/v2 v2.6.0 h1:z0cDbUV+aPASdFb2/ndFnS9ts/WNXgTNNGFoK
 github.com/clipperhouse/uax29/v2 v2.6.0/go.mod h1:Wn1g7MK6OoeDT0vL+Q0SQLDz/KpfsVRgg6W7ihQeh4g=
 github.com/cloudflare/circl v1.6.3 h1:9GPOhQGF9MCYUeXyMYlqTR6a5gTrgR/fBLXvUgtVcg8=
 github.com/cloudflare/circl v1.6.3/go.mod h1:2eXP6Qfat4O/Yhh8BznvKnJ+uzEoTQ6jVKJRn81BiS4=
-github.com/coder/coder/v2 v2.34.0-rc.0.0.20260701204415-db7f4438b4ad h1:dVCql8eMM+GBtPmIvdY1hPvONY234fmeZjNLYp5+IVQ=
-github.com/coder/coder/v2 v2.34.0-rc.0.0.20260701204415-db7f4438b4ad/go.mod h1:sJc0Y7Rd2kzqjdCMwfrebST+qPJprLub3+TVS7jXHQo=
+github.com/coder/coder/v2 v2.34.0-rc.0.0.20260713111656-06107768a8d6 h1:zEKALHu+grAlyUJejp6XZoRGkvOQyWYIfY0WEWVXNy8=
+github.com/coder/coder/v2 v2.34.0-rc.0.0.20260713111656-06107768a8d6/go.mod h1:imH39Jw6JBYWzFZtLx3juwWPhx+KxDqL3oPALrAh/U0=
 github.com/coder/pretty v0.0.0-20230908205945-e89ba86370e0 h1:3A0ES21Ke+FxEM8CXx9n47SZOKOpgSE1bbJzlE4qPVs=
 github.com/coder/pretty v0.0.0-20230908205945-e89ba86370e0/go.mod h1:5UuS2Ts+nTToAMeOjNlnHFkPahrtDkmpydBen/3wgZc=
 github.com/coder/retry v1.5.1 h1:iWu8YnD8YqHs3XwqrqsjoBTAVqT9ml6z9ViJ2wlMiqc=
@@ -182,8 +184,8 @@ github.com/felixge/httpsnoop v1.1.0 h1:3YtUj32ZZkqZtt3sZZsClsymw/QDuVfpNhoA31zeO
 github.com/felixge/httpsnoop v1.1.0/go.mod h1:Zqxgdd+1Rkcz8euOqdr7lqgCRJztwr5hp9vDSi5UZCE=
 github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
 github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
-github.com/go-chi/chi/v5 v5.2.4 h1:WtFKPHwlywe8Srng8j2BhOD9312j9cGUxG1SP4V2cR4=
-github.com/go-chi/chi/v5 v5.2.4/go.mod h1:X7Gx4mteadT3eDOMTsXzmI4/rwUpOwBHLpAfupzFJP0=
+github.com/go-chi/chi/v5 v5.3.1 h1:3j4HZLGZQ3JpMCrPJF/Jl3mYJfWLKBfNJ6quurUGCf8=
+github.com/go-chi/chi/v5 v5.3.1/go.mod h1:R+tYY2hNuVUUjxoPtqUdgBqevM9s9njzkTLutVsOCto=
 github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 h1:+zs/tPmkDkHx3U66DAb0lQFJrpS6731Oaa12ikc+DiI=
 github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376/go.mod h1:an3vInlBmSxCcxctByoQdvwPiA7DTK7jaaFDBTtu0ic=
 github.com/go-git/go-billy/v5 v5.9.0 h1:jItGXszUDRtR/AlferWPTMN4j38BQ88XnXKbilmmBPA=
@@ -313,8 +315,8 @@ github.com/kevinburke/ssh_config v1.2.0 h1:x584FjTGwHzMwvHx18PXxbBVzfnxogHaAReU4
 github.com/kevinburke/ssh_config v1.2.0/go.mod h1:CT57kijsi8u/K/BOFA39wgDQJ9CxiF4nAY/ojJ6r6mM=
 github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
-github.com/klauspost/compress v1.18.6 h1:2jupLlAwFm95+YDR+NwD2MEfFO9d4z4Prjl1XXDjuao=
-github.com/klauspost/compress v1.18.6/go.mod h1:cwPg85FWrGar70rWktvGQj8/hthj3wpl0PGDogxkrSQ=
+github.com/klauspost/compress v1.19.0 h1:sXLILfc9jV2QYWkzFOPWStmcUVH2RHEB1JCdY2oVvCQ=
+github.com/klauspost/compress v1.19.0/go.mod h1:cwPg85FWrGar70rWktvGQj8/hthj3wpl0PGDogxkrSQ=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
@@ -532,8 +534,8 @@ github.com/yuin/goldmark-meta v1.1.0 h1:pWw+JLHGZe8Rk0EGsMVssiNb/AaPMHfSRszZeUei
 github.com/yuin/goldmark-meta v1.1.0/go.mod h1:U4spWENafuA7Zyg+Lj5RqK/MF+ovMYtBvXi1lBb2VP0=
 github.com/yusufpapurcu/wmi v1.2.4 h1:zFUKzehAFReQwLys1b/iSMl+JQGSCSjtVqQn9bBrPo0=
 github.com/yusufpapurcu/wmi v1.2.4/go.mod h1:SBZ9tNy3G9/m5Oi98Zks0QjeHVDvuK0qfxQmPyzfmi0=
-github.com/zclconf/go-cty v1.18.1 h1:yEGE8M4iIZlyKQURZNb2SnEyZlZHUcBCnx6KF81KuwM=
-github.com/zclconf/go-cty v1.18.1/go.mod h1:qpnV6EDNgC1sns/AleL1fvatHw72j+S+nS+MJ+T2CSg=
+github.com/zclconf/go-cty v1.19.0 h1:IV8WdqYZc2c5rLX9bEoLNXKojBAp0MZPBHMIrCoa/s4=
+github.com/zclconf/go-cty v1.19.0/go.mod h1:12W89jGn3JCOIQi7infWr9m80rOkb5RNYJqXMZcN4c8=
 github.com/zclconf/go-cty-debug v0.0.0-20240509010212-0d6042c53940 h1:4r45xpDWB6ZMSMNJFMOjqrGHynW3DIBuR2H9j0ug+Mo=
 github.com/zclconf/go-cty-debug v0.0.0-20240509010212-0d6042c53940/go.mod h1:CmBdvvj3nqzfzJ6nTCIwDTPZ56aVGvDrmztiO5g3qrM=
 github.com/zeebo/assert v1.3.0 h1:g7C04CbJuIDKNPFHmsk4hwZDO5O+kntRxzaUoNXj+IQ=
@@ -695,8 +697,8 @@ golang.org/x/text v0.4.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.12.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
-golang.org/x/text v0.38.0 h1:sXmwo9DwP3OK9EZ7PqAdaooSGozfl/3a6/xJcbzPRhE=
-golang.org/x/text v0.38.0/go.mod h1:YXZt3QhHUKYT53r2lLKFIVi6Ao1jdzrTR/KQ09qyxF4=
+golang.org/x/text v0.39.0 h1:UbZz4pLOvn600D6Oh6GGEI6VAmndrEBLv8/6BEXzyus=
+golang.org/x/text v0.39.0/go.mod h1:3UwRclnC2g0TU9x8PZiyfOajCd1zaUNHF9cvqcQZ+ZM=
 golang.org/x/time v0.15.0 h1:bbrp8t3bGUeFOx08pvsMYRTCVSMk89u4tKbNOZbp88U=
 golang.org/x/time v0.15.0/go.mod h1:Y4YMaQmXwGQZoFaVFk4YpCt4FLQMYKZe9oeV/f4MSno=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
@@ -723,10 +725,10 @@ google.golang.org/genproto v0.0.0-20260610212136-7ab31c22f7ad h1:cYL1DPJAQr4JMvh
 google.golang.org/genproto v0.0.0-20260610212136-7ab31c22f7ad/go.mod h1:cVHIikDNAdx8ISZeW+2rYkEMf3xn0GSaBYmVnWXQBUo=
 google.golang.org/genproto/googleapis/api v0.0.0-20260610212136-7ab31c22f7ad h1:3iLyITS/sySRwbUKoC7ogfj2Yr1Cjs0pfaRKj5U5HEw=
 google.golang.org/genproto/googleapis/api v0.0.0-20260610212136-7ab31c22f7ad/go.mod h1:KdNqO+rCIWgFumrNBSEDlDNrkrQnpkax7Tv1WxNY8V4=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260610212136-7ab31c22f7ad h1:45WmJvIV6C2+O/jjLkPUH+F3aOj/1miDoU2DD0+NWbg=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20260610212136-7ab31c22f7ad/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
-google.golang.org/grpc v1.81.1 h1:VnnIIZ88UzOOKLukQi+ImGz8O1Wdp8nAGGnvOfEIWQQ=
-google.golang.org/grpc v1.81.1/go.mod h1:xGH9GfzOyMTGIOXBJmXt+BX/V0kcdQbdcuwQ/zNw42I=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260622175928-b703f567277d h1:mpAgMyM9vQHxycBlDq50y1VHpfSfVwzXvrQKtYbXuUY=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20260622175928-b703f567277d/go.mod h1:4Hqkh8ycfw05ld/3BWL7rJOSfebL2Q+DVDeRgYgxUU8=
+google.golang.org/grpc v1.82.0 h1:vguDnZUPjE26w09A63VoxZPnvPjB5Riyc0mkXPFmAIU=
+google.golang.org/grpc v1.82.0/go.mod h1:yzTZ1TB1Z3SG+LIYaI+WiE8D5+PZ3ArnrSp8zF3+/ZA=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=

integration/agents-model-test/main.tf

@@ -42,10 +42,13 @@ resource "coderd_agents_model" "claude_opus" {
       cache_read_price_per_million_tokens  = "0.5"
       cache_write_price_per_million_tokens = "6.25"
     }
+    reasoning_effort = {
+      default = "high"
+      max     = "high"
+    }
     provider_options = {
       anthropic = {
         send_reasoning = true
-        effort         = "high"
       }
     }
   })
@@ -63,10 +66,13 @@ resource "coderd_agents_model" "claude_sonnet" {
       input_price_per_million_tokens  = "3"
       output_price_per_million_tokens = "15"
     }
+    reasoning_effort = {
+      default = "max"
+      max     = "max"
+    }
     provider_options = {
       anthropic = {
         send_reasoning     = true
-        effort             = "max"
         web_search_enabled = true
         thinking = {
           budget_tokens = 16000
@@ -89,10 +95,13 @@ resource "coderd_agents_model" "gpt_xhigh" {
       output_price_per_million_tokens     = "15"
       cache_read_price_per_million_tokens = "0.25"
     }
+    reasoning_effort = {
+      default = "xhigh"
+      max     = "xhigh"
+    }
     provider_options = {
       openai = {
         parallel_tool_calls = false
-        reasoning_effort    = "xhigh"
         reasoning_summary   = "detailed"
         text_verbosity      = "high"
         web_search_enabled  = true
@@ -110,10 +119,9 @@ resource "coderd_agents_model" "gpt_mini" {
   compression_threshold = 70
 
   model_config = jsonencode({
-    provider_options = {
-      openai = {
-        reasoning_effort = "medium"
-      }
+    reasoning_effort = {
+      default = "medium"
+      max     = "medium"
     }
   })
 }

integration/integration_test.go

@@ -224,51 +224,59 @@ func TestIntegration(t *testing.T) {
 							"cache_read_price_per_million_tokens": "0.5",
 							"cache_write_price_per_million_tokens": "6.25"
 						},
-						"provider_options": {
-							"anthropic": {
-								"send_reasoning": true,
-								"effort": "high"
-							}
+						"reasoning_effort": {
+							"default": "high",
+								"max": "high"
+							},
+							"provider_options": {
+								"anthropic": {
+									"send_reasoning": true
+								}
 						}
-					}`},
+						}`},
 					"claude-sonnet-4-6": {"anthropic", `{
 						"cost": {
-							"input_price_per_million_tokens": "3",
+								"input_price_per_million_tokens": "3",
 							"output_price_per_million_tokens": "15"
-						},
-						"provider_options": {
+							},
+							"reasoning_effort": {
+								"default": "max",
+								"max": "max"
+							},
+							"provider_options": {
 							"anthropic": {
-								"send_reasoning": true,
-								"effort": "max",
-								"web_search_enabled": true,
-								"thinking": {
-									"budget_tokens": 16000
-								}
+									"send_reasoning": true,
+									"web_search_enabled": true,
+									"thinking": {
+										"budget_tokens": 16000
+									}
 							}
-						}
-					}`},
+							}
+						}`},
 					"gpt-5.5": {"openai", `{
-						"cost": {
-							"input_price_per_million_tokens": "2.5",
-							"output_price_per_million_tokens": "15",
-							"cache_read_price_per_million_tokens": "0.25"
+							"cost": {
+								"input_price_per_million_tokens": "2.5",
+								"output_price_per_million_tokens": "15",
+								"cache_read_price_per_million_tokens": "0.25"
+							},
+							"reasoning_effort": {
+								"default": "xhigh",
+							"max": "xhigh"
 						},
-						"provider_options": {
-							"openai": {
-								"parallel_tool_calls": false,
-								"reasoning_effort": "xhigh",
-								"reasoning_summary": "detailed",
+							"provider_options": {
+								"openai": {
+									"parallel_tool_calls": false,
+									"reasoning_summary": "detailed",
 								"text_verbosity": "high",
-								"web_search_enabled": true,
+									"web_search_enabled": true,
 								"search_context_size": "medium"
 							}
 						}
 					}`},
 					"gpt-5.4-mini": {"openai", `{
-						"provider_options": {
-							"openai": {
-								"reasoning_effort": "medium"
-							}
+						"reasoning_effort": {
+							"default": "medium",
+							"max": "medium"
 						}
 					}`},
 				}

internal/provider/agents_model_config.go

@@ -135,11 +135,12 @@ func agentsModelConfigCanonicalJSON(raw string) (string, error) {
 // agentsModelConfigSortedJSON re-encodes a JSON document with object keys sorted
 // alphabetically (recursively) and compact spacing, matching Terraform's
 // jsonencode output. Numbers are preserved verbatim via json.Number, so the only
-// change is key order. Coder stores model_config in the SDK struct's field order,
-// which is not alphabetical; without this the byte string in state never matches
-// the user's jsonencode config, and the framework's raw-byte plan guard
-// (server_planresourcechange.go: PlannedState.Raw.Equal(PriorState.Raw)) then
-// marks the computed updated_at attribute unknown on every plan after import.
+// change is key order. The model_config read back from Coder is re-encoded from
+// codersdk.ChatModelCallConfig in struct field order, which is not alphabetical;
+// without this the byte string in state never matches the user's jsonencode
+// config, and the framework's raw-byte plan guard (server_planresourcechange.go:
+// PlannedState.Raw.Equal(PriorState.Raw)) then marks the computed updated_at
+// attribute unknown on every plan after import.
 func agentsModelConfigSortedJSON(raw []byte) (string, error) {
 	dec := json.NewDecoder(bytes.NewReader(raw))
 	dec.UseNumber()
@@ -232,3 +233,46 @@ func (v agentsModelConfigNotEmptyValidator) ValidateString(_ context.Context, re
 		)
 	}
 }
+
+// agentsModelConfigNoDroppedKeysValidator rejects a model_config containing
+// settings the provider would silently drop when decoding into
+// codersdk.ChatModelCallConfig. Without it a removed or renamed field in the
+// SDK type would drop the user's setting with no plan-time error, and semantic
+// equality would hide the loss.
+type agentsModelConfigNoDroppedKeysValidator struct{}
+
+var _ validator.String = agentsModelConfigNoDroppedKeysValidator{}
+
+func (v agentsModelConfigNoDroppedKeysValidator) Description(_ context.Context) string {
+	return "model_config must only contain settings from the Coder chat model config schema this provider was built against; unrecognized settings would be silently dropped."
+}
+
+func (v agentsModelConfigNoDroppedKeysValidator) MarkdownDescription(ctx context.Context) string {
+	return v.Description(ctx)
+}
+
+func (v agentsModelConfigNoDroppedKeysValidator) ValidateString(_ context.Context, req validator.StringRequest, resp *validator.StringResponse) {
+	if req.ConfigValue.IsNull() || req.ConfigValue.IsUnknown() {
+		return
+	}
+	// Invalid or non-object JSON is left for the custom type and the not-empty
+	// validator to report.
+	if _, err := agentsModelConfigCanonicalJSON(req.ConfigValue.ValueString()); err != nil {
+		return
+	}
+	// The lenient decode above succeeded, so a strict failure can only be an
+	// unknown field.
+	var config codersdk.ChatModelCallConfig
+	if err := config.UnmarshalStrict([]byte(req.ConfigValue.ValueString())); err != nil {
+		resp.Diagnostics.AddAttributeError(
+			req.Path,
+			"Unrecognized model_config settings",
+			fmt.Sprintf(
+				"model_config contains a setting that is not part of the Coder chat model config schema this provider was built against, so it would be silently dropped before reaching Coder: %s. "+
+					"If the setting is valid for your Coder deployment, upgrade the provider to a version built against your Coder release; otherwise remove it or fix the field name. "+
+					"See https://pkg.go.dev/github.com/coder/coder/v2/codersdk#ChatModelCallConfig.",
+				err,
+			),
+		)
+	}
+}