diff --git a/src/config/schema/athena.test.ts b/src/config/schema/athena.test.ts
new file mode 100644
index 000000000..4250a59fe
--- /dev/null
+++ b/src/config/schema/athena.test.ts
@@ -0,0 +1,189 @@
+import { describe, expect, test } from "bun:test"
+import { z } from "zod"
+import { AthenaConfigSchema, CouncilConfigSchema, CouncilMemberSchema } from "./athena"
+
+describe("CouncilMemberSchema", () => {
+  test("accepts model-only member config", () => {
+    //#given
+    const config = { model: "anthropic/claude-opus-4-6" }
+
+    //#when
+    const result = CouncilMemberSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(true)
+  })
+
+  test("accepts member config with all optional fields", () => {
+    //#given
+    const config = {
+      model: "openai/gpt-5.3-codex",
+      temperature: 0.4,
+      variant: "high",
+      name: "analyst-a",
+    }
+
+    //#when
+    const result = CouncilMemberSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(true)
+  })
+
+  test("rejects member config missing model", () => {
+    //#given
+    const config = { temperature: 0.5 }
+
+    //#when
+    const result = CouncilMemberSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(false)
+  })
+
+  test("rejects temperature below 0", () => {
+    //#given
+    const config = { model: "openai/gpt-5.3-codex", temperature: -0.1 }
+
+    //#when
+    const result = CouncilMemberSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(false)
+  })
+
+  test("rejects temperature above 2", () => {
+    //#given
+    const config = { model: "openai/gpt-5.3-codex", temperature: 2.1 }
+
+    //#when
+    const result = CouncilMemberSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(false)
+  })
+
+  test("z.infer produces expected type shape", () => {
+    //#given
+    type InferredCouncilMember = z.infer<typeof CouncilMemberSchema>
+    const member: InferredCouncilMember = {
+      model: "anthropic/claude-opus-4-6",
+      temperature: 0.1,
+      variant: "medium",
+      name: "oracle",
+    }
+
+    //#when
+    const model = member.model
+
+    //#then
+    expect(model).toBe("anthropic/claude-opus-4-6")
+  })
+
+  test("optional fields are optional without runtime defaults", () => {
+    //#given
+    const config = { model: "xai/grok-code-fast-1" }
+
+    //#when
+    const parsed = CouncilMemberSchema.parse(config)
+
+    //#then
+    expect(parsed.temperature).toBeUndefined()
+    expect(parsed.variant).toBeUndefined()
+    expect(parsed.name).toBeUndefined()
+  })
+})
+
+describe("CouncilConfigSchema", () => {
+  test("accepts council with 2 members", () => {
+    //#given
+    const config = {
+      members: [{ model: "anthropic/claude-opus-4-6" }, { model: "openai/gpt-5.3-codex" }],
+    }
+
+    //#when
+    const result = CouncilConfigSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(true)
+  })
+
+  test("accepts council with 3 members and optional fields", () => {
+    //#given
+    const config = {
+      members: [
+        { model: "anthropic/claude-opus-4-6", name: "a", temperature: 0.1 },
+        { model: "openai/gpt-5.3-codex", name: "b", variant: "high" },
+        { model: "xai/grok-code-fast-1", name: "c", temperature: 1.2, variant: "low" },
+      ],
+    }
+
+    //#when
+    const result = CouncilConfigSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(true)
+  })
+
+  test("rejects council with 0 members", () => {
+    //#given
+    const config = { members: [] }
+
+    //#when
+    const result = CouncilConfigSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(false)
+  })
+
+  test("rejects council with 1 member", () => {
+    //#given
+    const config = { members: [{ model: "anthropic/claude-opus-4-6" }] }
+
+    //#when
+    const result = CouncilConfigSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(false)
+  })
+
+  test("rejects council missing members field", () => {
+    //#given
+    const config = {}
+
+    //#when
+    const result = CouncilConfigSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(false)
+  })
+})
+
+describe("AthenaConfigSchema", () => {
+  test("accepts Athena config with model and council", () => {
+    //#given
+    const config = {
+      model: "anthropic/claude-opus-4-6",
+      council: {
+        members: [{ model: "openai/gpt-5.3-codex" }, { model: "xai/grok-code-fast-1" }],
+      },
+    }
+
+    //#when
+    const result = AthenaConfigSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(true)
+  })
+
+  test("rejects Athena config without council", () => {
+    //#given
+    const config = { model: "anthropic/claude-opus-4-6" }
+
+    //#when
+    const result = AthenaConfigSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(false)
+  })
+})