diff --git a/src/agents/AGENTS.md b/src/agents/AGENTS.md
index 65c02e15..ad78363a 100644
--- a/src/agents/AGENTS.md
+++ b/src/agents/AGENTS.md
@@ -35,7 +35,7 @@ Agent factories following `createXXXAgent(model) → AgentConfig` pattern. Each
 | Atlas | task, call_omo_agent |
 | Momus | write, edit, task |
 | Athena | write, edit, call_omo_agent |
-| Council-Member | write, edit, task, call_omo_agent, switch_agent, background_wait, prepare_council_prompt |
+| Council-Member | ALL except read, grep, glob, lsp_*, ast_grep_search (allow-list) |
 
 ## STRUCTURE
 
diff --git a/src/agents/athena/council-member-agent.ts b/src/agents/athena/council-member-agent.ts
index fa53f2ca..16fafc25 100644
--- a/src/agents/athena/council-member-agent.ts
+++ b/src/agents/athena/council-member-agent.ts
@@ -1,11 +1,11 @@
 import type { AgentConfig } from "@opencode-ai/sdk"
 import type { AgentMode } from "../types"
-import { createAgentToolRestrictions } from "../../shared/permission-compat"
+import { createAgentToolAllowlist } from "../../shared"
 import { applyModelThinkingConfig } from "./model-thinking-config"
 
 const MODE: AgentMode = "subagent"
 
-const COUNCIL_MEMBER_PROMPT = `You are an independent code analyst in a multi-model analysis council. Your role is to provide thorough, evidence-based analysis.
+export const COUNCIL_MEMBER_PROMPT = `You are an independent code analyst in a multi-model analysis council. Your role is to provide thorough, evidence-based analysis.
 
 ## Your Role
 - You are one of several AI models analyzing the same question independently
@@ -25,14 +25,16 @@ const COUNCIL_MEMBER_PROMPT = `You are an independent code analyst in a multi-mo
 5. Be concise but thorough — quality over quantity`
 
 export function createCouncilMemberAgent(model: string): AgentConfig {
-  const restrictions = createAgentToolRestrictions([
-    "write",
-    "edit",
-    "task",
-    "call_omo_agent",
-    "switch_agent",
-    "background_wait",
-    "prepare_council_prompt",
+  // Allow-list: only read-only analysis tools. Everything else is denied via `*: deny`.
+  const restrictions = createAgentToolAllowlist([
+    "read",
+    "grep",
+    "glob",
+    "lsp_goto_definition",
+    "lsp_find_references",
+    "lsp_symbols",
+    "lsp_diagnostics",
+    "ast_grep_search",
   ])
 
   const base = {
diff --git a/src/plugin/tool-registry.ts b/src/plugin/tool-registry.ts
index dad7d2f5..020a5121 100644
--- a/src/plugin/tool-registry.ts
+++ b/src/plugin/tool-registry.ts
@@ -139,7 +139,7 @@ export function createToolRegistry(args: {
     interactive_bash,
     ...taskToolsRecord,
     ...hashlineToolsRecord,
-    prepare_council_prompt: createPrepareCouncilPromptTool(),
+    prepare_council_prompt: createPrepareCouncilPromptTool(ctx.directory),
   }
 
   const filteredTools = filterDisabledTools(allTools, pluginConfig.disabled_tools)
diff --git a/src/shared/agent-tool-restrictions.ts b/src/shared/agent-tool-restrictions.ts
index 37192b35..19ff8459 100644
--- a/src/shared/agent-tool-restrictions.ts
+++ b/src/shared/agent-tool-restrictions.ts
@@ -53,17 +53,21 @@ const AGENT_RESTRICTIONS: Record<string, Record<string, boolean>> = {
 
   // NOTE: Athena/council tool restrictions are also defined in:
   // - src/agents/athena/agent.ts (AgentConfig permission format)
-  // - src/agents/athena/council-member-agent.ts (AgentConfig permission format)
+  // - src/agents/athena/council-member-agent.ts (AgentConfig permission format — allow-list)
   // - src/plugin-handlers/tool-config-handler.ts (allow/deny string format)
   // Keep all three in sync when modifying.
+  // Council members use an allow-list: only read-only analysis tools are permitted.
+  // Prompt file lives in .sisyphus/tmp/ (inside project) so no external_directory needed.
   "council-member": {
-    write: false,
-    edit: false,
-    task: false,
-    call_omo_agent: false,
-    switch_agent: false,
-    background_wait: false,
-    prepare_council_prompt: false,
+    "*": false,
+    read: true,
+    grep: true,
+    glob: true,
+    lsp_goto_definition: true,
+    lsp_find_references: true,
+    lsp_symbols: true,
+    lsp_diagnostics: true,
+    ast_grep_search: true,
   },
 }
 
diff --git a/src/tools/prepare-council-prompt/tools.ts b/src/tools/prepare-council-prompt/tools.ts
index 6117fea7..f587f972 100644
--- a/src/tools/prepare-council-prompt/tools.ts
+++ b/src/tools/prepare-council-prompt/tools.ts
@@ -1,13 +1,14 @@
 import { tool, type ToolDefinition } from "@opencode-ai/plugin"
 import { randomUUID } from "node:crypto"
-import { writeFile, unlink } from "node:fs/promises"
+import { writeFile, unlink, mkdir } from "node:fs/promises"
 import { join } from "node:path"
-import { tmpdir } from "node:os"
 import { log } from "../../shared/logger"
+import { COUNCIL_MEMBER_PROMPT } from "../../agents/athena/council-member-agent"
 
 const CLEANUP_DELAY_MS = 30 * 60 * 1000
+const COUNCIL_TMP_DIR = ".sisyphus/tmp"
 
-export function createPrepareCouncilPromptTool(): ToolDefinition {
+export function createPrepareCouncilPromptTool(directory: string): ToolDefinition {
   const description = `Save a council analysis prompt to a temp file so council members can read it.
 
 Athena-only tool. Saves the prompt once, then each council member task() call uses a short
@@ -26,10 +27,19 @@ Returns the file path to reference in subsequent task() calls.`
         return "Prompt cannot be empty."
       }
 
-      const filename = `athena-council-${randomUUID().slice(0, 8)}.md`
-      const filePath = join(tmpdir(), filename)
+      const tmpDir = join(directory, COUNCIL_TMP_DIR)
+      await mkdir(tmpDir, { recursive: true })
 
-      await writeFile(filePath, args.prompt, "utf-8")
+      const filename = `athena-council-${randomUUID().slice(0, 8)}.md`
+      const filePath = join(tmpDir, filename)
+
+      const content = `${COUNCIL_MEMBER_PROMPT}
+
+## Analysis Question
+
+${args.prompt}`
+
+      await writeFile(filePath, content, "utf-8")
 
       setTimeout(() => {
         unlink(filePath).catch(() => {})