fix(model-capabilities): disable thinking for minimax and non-thinking kimi

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/shared/model-capabilities.test.ts

@@ -59,6 +59,12 @@ describe("getModelCapabilities", () => {
           output: 128_000,
         },
       },
+      "minimax-m2.7": {
+        id: "minimax-m2.7",
+        family: "minimax",
+        reasoning: true,
+        temperature: true,
+      },
     },
   }
 
@@ -325,6 +331,55 @@ describe("getModelCapabilities", () => {
     })
   })
 
+  test("marks MiniMax M2.7 as not supporting thinking despite snapshot reasoning", () => {
+    // given
+    const modelID = "minimax-m2.7"
+
+    // when
+    const result = getModelCapabilities({
+      providerID: "volcengine",
+      modelID,
+      bundledSnapshot,
+    })
+
+    // then
+    expect(result.supportsThinking).toBe(false)
+    expect(result.diagnostics.supportsThinking.source).toBe("heuristic")
+  })
+
+  test("marks non-thinking Kimi K2.6 as not supporting thinking", () => {
+    // given
+    const modelID = "kimi-k2.6"
+
+    // when
+    const result = getModelCapabilities({
+      providerID: "volcengine",
+      modelID,
+      bundledSnapshot,
+    })
+
+    // then
+    expect(result.supportsThinking).toBe(false)
+    expect(result.diagnostics.supportsThinking.source).toBe("heuristic")
+  })
+
+  test("keeps thinking-flavored Kimi K2.6 models as supporting thinking", () => {
+    // given
+    const modelID = "kimi-k2.6-thinking"
+
+    // when
+    const result = getModelCapabilities({
+      providerID: "volcengine",
+      modelID,
+      bundledSnapshot,
+    })
+
+    // then
+    expect(result.supportsThinking).toBe(true)
+    expect(result.family).toBe("kimi-thinking")
+    expect(result.diagnostics.supportsThinking.source).toBe("heuristic")
+  })
+
   test("detects prefixed o-series model IDs through the heuristic fallback", () => {
     const result = getModelCapabilities({
       providerID: "azure-openai",

src/shared/model-capability-heuristics.ts

@@ -44,10 +44,18 @@ export const HEURISTIC_MODEL_FAMILY_REGISTRY: ReadonlyArray<HeuristicModelFamily
     includes: ["gemini"],
     variants: ["low", "medium", "high"],
   },
+  {
+    family: "kimi-thinking",
+    includes: ["kimi-thinking", "k2-thinking", "k2-think"],
+    pattern: /(?:kimi|k2).*-(?:thinking|think)/,
+    variants: ["low", "medium", "high"],
+    supportsThinking: true,
+  },
   {
     family: "kimi",
     includes: ["kimi", "k2"],
     variants: ["low", "medium", "high"],
+    supportsThinking: false,
   },
   {
     family: "glm",
@@ -58,6 +66,7 @@ export const HEURISTIC_MODEL_FAMILY_REGISTRY: ReadonlyArray<HeuristicModelFamily
     family: "minimax",
     includes: ["minimax"],
     variants: ["low", "medium", "high"],
+    supportsThinking: false,
   },
   {
     family: "deepseek",

src/shared/model-settings-compatibility.test.ts

@@ -1,5 +1,6 @@
 import { describe, expect, test } from "bun:test"
 
+import { getModelCapabilities } from "./model-capabilities"
 import { resolveCompatibleModelSettings } from "./model-settings-compatibility"
 
 describe("resolveCompatibleModelSettings", () => {
@@ -467,6 +468,48 @@ describe("resolveCompatibleModelSettings", () => {
     ])
   })
 
+  test("drops thinking for MiniMax M2.7 capabilities resolved from heuristics", () => {
+    // given
+    const capabilities = getModelCapabilities({
+      providerID: "volcengine",
+      modelID: "minimax-m2.7",
+    })
+
+    // when
+    const result = resolveCompatibleModelSettings({
+      providerID: "volcengine",
+      modelID: "minimax-m2.7",
+      desired: { thinking: { type: "enabled", budgetTokens: 4096 } },
+      capabilities,
+    })
+
+    // then
+    expect(result.thinking).toBeUndefined()
+    expect(result.changes[0]?.field).toBe("thinking")
+    expect(result.changes[0]?.reason).toBe("unsupported-by-model-metadata")
+  })
+
+  test("drops thinking for non-thinking Kimi K2.6 capabilities resolved from heuristics", () => {
+    // given
+    const capabilities = getModelCapabilities({
+      providerID: "volcengine",
+      modelID: "kimi-k2.6",
+    })
+
+    // when
+    const result = resolveCompatibleModelSettings({
+      providerID: "volcengine",
+      modelID: "kimi-k2.6",
+      desired: { thinking: { type: "enabled", budgetTokens: 4096 } },
+      capabilities,
+    })
+
+    // then
+    expect(result.thinking).toBeUndefined()
+    expect(result.changes[0]?.field).toBe("thinking")
+    expect(result.changes[0]?.reason).toBe("unsupported-by-model-metadata")
+  })
+
   test("clamps maxTokens to the model output limit", () => {
     const result = resolveCompatibleModelSettings({
       providerID: "openai",