fix(providers/anthropic): send thinking display

.github/workflows/build.yml

@@ -2,10 +2,73 @@ name: build
 on: [push, pull_request]
 
 jobs:
+  govulncheck:
+    runs-on: ubuntu-latest
+    env:
+      GH_PAT: "${{ secrets.PERSONAL_ACCESS_TOKEN }}"
+      GOTOOLCHAIN: local
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      # The reusable charmbracelet/meta govulncheck job always reads go.mod.
+      # Keep the module baseline at Go 1.25.0, but run the scanner with Go 1.26.4
+      # so it uses a fixed standard library.
+      - uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6.4.0
+        with:
+          go-version: "1.26.4"
+          cache: true
+          check-latest: true
+      - run: |
+          git config --global url."https://${{ secrets.PERSONAL_ACCESS_TOKEN }}@github.com/charmbracelet".insteadOf "https://github.com/charmbracelet"
+          git config --global url."https://${{ secrets.PERSONAL_ACCESS_TOKEN }}@github.com/charmcli".insteadOf "https://github.com/charmcli"
+        if: env.GH_PAT != ''
+      - run: go install golang.org/x/vuln/cmd/govulncheck@latest
+      - run: go mod tidy
+      - run: govulncheck ./...
+
   build:
-    uses: charmbracelet/meta/.github/workflows/build.yml@main
-    with:
-      go-version: ""
-      go-version-file: ./go.mod
-    secrets:
-      gh_pat: "${{ secrets.PERSONAL_ACCESS_TOKEN }}"
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    env:
+      GO111MODULE: "on"
+      GH_PAT: "${{ secrets.PERSONAL_ACCESS_TOKEN }}"
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - run: |
+          git config --global url."https://${{ secrets.PERSONAL_ACCESS_TOKEN }}@github.com/charmbracelet".insteadOf "https://github.com/charmbracelet"
+          git config --global url."https://${{ secrets.PERSONAL_ACCESS_TOKEN }}@github.com/charmcli".insteadOf "https://github.com/charmcli"
+        if: env.GH_PAT != ''
+      - name: Install Go
+        uses: actions/setup-go@4a3601121dd01d1626a1e23e37211e3254c1c06c # v6.4.0
+        with:
+          go-version-file: go.mod
+          cache: true
+      - name: Tidy Go modules
+        run: go mod tidy
+      - name: Check for changes
+        run: git diff --exit-code
+      - name: Build
+        run: go build ./...
+      - name: Test
+        run: go test ./...
+
+  dependabot:
+    needs: [build, govulncheck]
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: write
+    if: ${{ github.actor == 'dependabot[bot]' && github.event_name == 'pull_request' }}
+    steps:
+      - id: metadata
+        uses: dependabot/fetch-metadata@25dd0e34f4fe68f24cc83900b1fe3fe149efef98 # v3.1.0
+        with:
+          github-token: "${{ secrets.GITHUB_TOKEN }}"
+      - run: |
+          gh pr review --approve "$PR_URL"
+          gh pr merge --squash --auto "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

go.mod

@@ -66,11 +66,11 @@ require (
 	go.opentelemetry.io/otel/metric v1.39.0 // indirect
 	go.opentelemetry.io/otel/trace v1.39.0 // indirect
 	go.yaml.in/yaml/v4 v4.0.0-rc.3 // indirect
-	golang.org/x/crypto v0.47.0 // indirect
-	golang.org/x/net v0.49.0 // indirect
-	golang.org/x/sync v0.19.0 // indirect
-	golang.org/x/sys v0.40.0 // indirect
-	golang.org/x/text v0.33.0 // indirect
+	golang.org/x/crypto v0.51.0 // indirect
+	golang.org/x/net v0.55.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/sys v0.45.0 // indirect
+	golang.org/x/text v0.37.0 // indirect
 	golang.org/x/time v0.14.0 // indirect
 	google.golang.org/api v0.264.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20260128011058-8636f8732409 // indirect

go.sum

@@ -152,18 +152,18 @@ go.opentelemetry.io/otel/trace v1.39.0 h1:2d2vfpEDmCJ5zVYz7ijaJdOF59xLomrvj7bjt6
 go.opentelemetry.io/otel/trace v1.39.0/go.mod h1:88w4/PnZSazkGzz/w84VHpQafiU4EtqqlVdxWy+rNOA=
 go.yaml.in/yaml/v4 v4.0.0-rc.3 h1:3h1fjsh1CTAPjW7q/EMe+C8shx5d8ctzZTrLcs/j8Go=
 go.yaml.in/yaml/v4 v4.0.0-rc.3/go.mod h1:aZqd9kCMsGL7AuUv/m/PvWLdg5sjJsZ4oHDEnfPPfY0=
-golang.org/x/crypto v0.47.0 h1:V6e3FRj+n4dbpw86FJ8Fv7XVOql7TEwpHapKoMJ/GO8=
-golang.org/x/crypto v0.47.0/go.mod h1:ff3Y9VzzKbwSSEzWqJsJVBnWmRwRSHt/6Op5n9bQc4A=
-golang.org/x/net v0.49.0 h1:eeHFmOGUTtaaPSGNmjBKpbng9MulQsJURQUAfUwY++o=
-golang.org/x/net v0.49.0/go.mod h1:/ysNB2EvaqvesRkuLAyjI1ycPZlQHM3q01F02UY/MV8=
+golang.org/x/crypto v0.51.0 h1:IBPXwPfKxY7cWQZ38ZCIRPI50YLeevDLlLnyC5wRGTI=
+golang.org/x/crypto v0.51.0/go.mod h1:8AdwkbraGNABw2kOX6YFPs3WM22XqI4EXEd8g+x7Oc8=
+golang.org/x/net v0.55.0 h1:bcvxaJn3e1U6InsFWt1JUq1aSjnRxLzT2rtD2KfkDF8=
+golang.org/x/net v0.55.0/go.mod h1:L5U2KuzuOe1lY7Z+aWVIKK6qEeJXnXV9yzGA+WCHJww=
 golang.org/x/oauth2 v0.36.0 h1:peZ/1z27fi9hUOFCAZaHyrpWG5lwe0RJEEEeH0ThlIs=
 golang.org/x/oauth2 v0.36.0/go.mod h1:YDBUJMTkDnJS+A4BP4eZBjCqtokkg1hODuPjwiGPO7Q=
-golang.org/x/sync v0.19.0 h1:vV+1eWNmZ5geRlYjzm2adRgW2/mcpevXNg50YZtPCE4=
-golang.org/x/sync v0.19.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
-golang.org/x/sys v0.40.0 h1:DBZZqJ2Rkml6QMQsZywtnjnnGvHza6BTfYFWY9kjEWQ=
-golang.org/x/sys v0.40.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
-golang.org/x/text v0.33.0 h1:B3njUFyqtHDUI5jMn1YIr5B0IE2U0qck04r6d4KPAxE=
-golang.org/x/text v0.33.0/go.mod h1:LuMebE6+rBincTi9+xWTY8TztLzKHc/9C1uBCG27+q8=
+golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
+golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sys v0.45.0 h1:dO4czNzziLiiXplLQgBCEpCvXQ3dnkn0SdaZSYdQ+FY=
+golang.org/x/sys v0.45.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/text v0.37.0 h1:Cqjiwd9eSg8e0QAkyCaQTNHFIIzWtidPahFWR83rTrc=
+golang.org/x/text v0.37.0/go.mod h1:a5sjxXGs9hsn/AJVwuElvCAo9v8QYLzvavO5z2PiM38=
 golang.org/x/time v0.14.0 h1:MRx4UaLrDotUKUdCIqzPC48t1Y9hANFKIRpNx+Te8PI=
 golang.org/x/time v0.14.0/go.mod h1:eL/Oa2bBBK0TkX57Fyni+NgnyQQN4LitPmob2Hjnqw4=
 gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=

providers/anthropic/anthropic.go

@@ -11,6 +11,7 @@ import (
 	"io"
 	"maps"
 	"math"
+	"strconv"
 	"strings"
 
 	"charm.land/fantasy"
@@ -38,6 +39,51 @@ func betaRequestOptions(flags []string) []option.RequestOption {
 	return opts
 }
 
+func thinkingDisplay(providerOptions *ProviderOptions, modelID string) (ThinkingDisplay, bool) {
+	if providerOptions != nil && providerOptions.ThinkingDisplay != nil && *providerOptions.ThinkingDisplay != "" {
+		return *providerOptions.ThinkingDisplay, true
+	}
+	if defaultsToOmittedThinkingDisplay(modelID) {
+		return ThinkingDisplaySummarized, true
+	}
+	return "", false
+}
+
+func defaultsToAdaptiveThinking(model string) bool {
+	model = strings.ToLower(strings.TrimSpace(model))
+	return strings.Contains(model, "claude-mythos-preview")
+}
+
+func requiresAdaptiveThinking(model string) bool {
+	return defaultsToAdaptiveThinking(model) || defaultsToOmittedOpusThinkingDisplay(model)
+}
+
+func setThinkingDisplay(param interface{ SetExtraFields(map[string]any) }, display ThinkingDisplay) {
+	param.SetExtraFields(map[string]any{"display": string(display)})
+}
+
+func defaultsToOmittedThinkingDisplay(model string) bool {
+	model = strings.ToLower(strings.TrimSpace(model))
+	return defaultsToAdaptiveThinking(model) || defaultsToOmittedOpusThinkingDisplay(model)
+}
+
+func defaultsToOmittedOpusThinkingDisplay(model string) bool {
+	_, suffix, ok := strings.Cut(model, "claude-opus-4-")
+	if !ok {
+		return false
+	}
+
+	versionEnd := 0
+	for versionEnd < len(suffix) && suffix[versionEnd] >= '0' && suffix[versionEnd] <= '9' {
+		versionEnd++
+	}
+	if versionEnd == 0 || versionEnd > 2 {
+		return false
+	}
+	minor, err := strconv.Atoi(suffix[:versionEnd])
+	return err == nil && minor >= 7
+}
+
 // buildRequestOptions constructs the common request options shared
 // by Generate and Stream: user-agent, raw tool injection, and any
 // beta API flags.
@@ -335,12 +381,26 @@ func (a languageModel) prepareParams(call fantasy.Call) (
 			Effort: anthropic.OutputConfigEffort(effort),
 		}
 		adaptive := anthropic.NewThinkingConfigAdaptiveParam()
+		if display, ok := thinkingDisplay(providerOptions, a.modelID); ok {
+			setThinkingDisplay(&adaptive, display)
+		}
 		params.Thinking.OfAdaptive = &adaptive
 	case providerOptions.Thinking != nil:
 		if providerOptions.Thinking.BudgetTokens == 0 {
 			return nil, nil, nil, nil, &fantasy.Error{Title: "no budget", Message: "thinking requires budget"}
 		}
-		params.Thinking = anthropic.ThinkingConfigParamOfEnabled(providerOptions.Thinking.BudgetTokens)
+		if requiresAdaptiveThinking(a.modelID) {
+			adaptive := anthropic.NewThinkingConfigAdaptiveParam()
+			if display, ok := thinkingDisplay(providerOptions, a.modelID); ok {
+				setThinkingDisplay(&adaptive, display)
+			}
+			params.Thinking.OfAdaptive = &adaptive
+		} else {
+			params.Thinking = anthropic.ThinkingConfigParamOfEnabled(providerOptions.Thinking.BudgetTokens)
+			if display, ok := thinkingDisplay(providerOptions, a.modelID); ok {
+				setThinkingDisplay(params.Thinking.OfEnabled, display)
+			}
+		}
 		if call.Temperature != nil {
 			params.Temperature = param.Opt[float64]{}
 			warnings = append(warnings, fantasy.CallWarning{
@@ -365,6 +425,12 @@ func (a languageModel) prepareParams(call fantasy.Call) (
 				Details: "TopK is not supported when thinking is enabled",
 			})
 		}
+	case defaultsToAdaptiveThinking(a.modelID):
+		adaptive := anthropic.NewThinkingConfigAdaptiveParam()
+		if display, ok := thinkingDisplay(providerOptions, a.modelID); ok {
+			setThinkingDisplay(&adaptive, display)
+		}
+		params.Thinking.OfAdaptive = &adaptive
 	}
 
 	if len(call.Tools) > 0 {