diff --git a/scripts/dev-api.js b/scripts/dev-api.js
index 5ed498e..f311bed 100644
--- a/scripts/dev-api.js
+++ b/scripts/dev-api.js
@@ -3329,6 +3329,7 @@ const HERMES_APPROVAL_MODES = new Set(['manual', 'smart', 'off'])
 const HERMES_APPROVAL_CRON_MODES = new Set(['deny', 'approve'])
 const HERMES_LOGGING_LEVELS = new Set(['DEBUG', 'INFO', 'WARNING'])
 const HERMES_AGENT_IMAGE_INPUT_MODES = new Set(['auto', 'native', 'text'])
+const HERMES_PROMPT_CACHE_TTLS = new Set(['5m', '1h'])
 const HERMES_DISPLAY_TOOL_PROGRESS_VALUES = new Set(['off', 'new', 'all', 'verbose'])
 const HERMES_DISPLAY_STREAMING_VALUES = new Set(['inherit', 'true', 'false'])
 const HERMES_DISPLAY_RESUME_VALUES = new Set(['full', 'minimal'])
@@ -3444,6 +3445,13 @@ function normalizeHermesImageInputMode(value, strict = false) {
   return 'auto'
 }
 
+function normalizeHermesPromptCacheTtl(value, strict = false) {
+  const ttl = String(value ?? '').trim().toLowerCase() || '5m'
+  if (HERMES_PROMPT_CACHE_TTLS.has(ttl)) return ttl
+  if (strict) throw new Error('prompt_caching.cache_ttl 必须是 5m 或 1h')
+  return '5m'
+}
+
 function normalizeHermesDisplayToolProgress(value, strict = false, key = 'display.tool_progress') {
   const progress = String(value ?? '').trim().toLowerCase() || 'all'
   if (HERMES_DISPLAY_TOOL_PROGRESS_VALUES.has(progress)) return progress
@@ -3645,6 +3653,27 @@ export function mergeHermesCompressionConfig(config = {}, form = {}) {
   return next
 }
 
+export function buildHermesPromptCachingConfigValues(config = {}) {
+  const root = config && typeof config === 'object' && !Array.isArray(config) ? config : {}
+  const promptCaching = root.prompt_caching && typeof root.prompt_caching === 'object' && !Array.isArray(root.prompt_caching)
+    ? root.prompt_caching
+    : {}
+  return {
+    promptCacheTtl: normalizeHermesPromptCacheTtl(promptCaching.cache_ttl, false),
+  }
+}
+
+export function mergeHermesPromptCachingConfig(config = {}, form = {}) {
+  const next = mergeConfigsPreservingFields({}, config && typeof config === 'object' && !Array.isArray(config) ? config : {})
+  const currentValues = buildHermesPromptCachingConfigValues(next)
+  const promptCaching = next.prompt_caching && typeof next.prompt_caching === 'object' && !Array.isArray(next.prompt_caching)
+    ? mergeConfigsPreservingFields(next.prompt_caching, {})
+    : {}
+  promptCaching.cache_ttl = normalizeHermesPromptCacheTtl(Object.hasOwn(form, 'promptCacheTtl') ? form.promptCacheTtl : currentValues.promptCacheTtl, true)
+  next.prompt_caching = promptCaching
+  return next
+}
+
 export function buildHermesToolLoopGuardrailsConfigValues(config = {}) {
   const root = config && typeof config === 'object' && !Array.isArray(config) ? config : {}
   const guardrails = root.tool_loop_guardrails && typeof root.tool_loop_guardrails === 'object' && !Array.isArray(root.tool_loop_guardrails)
@@ -10623,6 +10652,27 @@ const handlers = {
     }
   },
 
+  hermes_prompt_caching_config_read() {
+    const { configPath, exists, config } = readHermesConfigYamlObject()
+    return {
+      exists,
+      configPath,
+      values: buildHermesPromptCachingConfigValues(config),
+    }
+  },
+
+  hermes_prompt_caching_config_save({ form } = {}) {
+    const { configPath, config } = readHermesConfigYamlObject()
+    const next = mergeHermesPromptCachingConfig(config, form || {})
+    const backup = writeHermesConfigYamlObject(configPath, next)
+    return {
+      ok: true,
+      configPath,
+      backup,
+      values: buildHermesPromptCachingConfigValues(next),
+    }
+  },
+
   hermes_tool_loop_guardrails_config_read() {
     const { configPath, exists, config } = readHermesConfigYamlObject()
     return {
diff --git a/src-tauri/src/commands/hermes.rs b/src-tauri/src/commands/hermes.rs
index 11aee45..b6f82a8 100644
--- a/src-tauri/src/commands/hermes.rs
+++ b/src-tauri/src/commands/hermes.rs
@@ -2167,6 +2167,7 @@ const HERMES_CHANNEL_PLATFORMS: [&str; 10] = [
 
 const HERMES_DISPLAY_TOOL_PROGRESS_VALUES: [&str; 4] = ["off", "new", "all", "verbose"];
 const HERMES_DISPLAY_STREAMING_VALUES: [&str; 3] = ["inherit", "true", "false"];
+const HERMES_PROMPT_CACHE_TTLS: [&str; 2] = ["5m", "1h"];
 
 fn normalize_hermes_channel_platform(platform: &str) -> Option<&'static str> {
     let platform = platform.trim().to_ascii_lowercase();
@@ -2248,6 +2249,25 @@ fn normalize_hermes_display_streaming_json(
     normalize_hermes_display_streaming_text(None, strict, key)
 }
 
+fn normalize_hermes_prompt_cache_ttl(
+    value: Option<String>,
+    strict: bool,
+) -> Result<String, String> {
+    let ttl = value.unwrap_or_default().trim().to_ascii_lowercase();
+    let ttl = if ttl.is_empty() {
+        "5m".to_string()
+    } else {
+        ttl
+    };
+    if HERMES_PROMPT_CACHE_TTLS.contains(&ttl.as_str()) {
+        Ok(ttl)
+    } else if strict {
+        Err("prompt_caching.cache_ttl 必须是 5m 或 1h".to_string())
+    } else {
+        Ok("5m".to_string())
+    }
+}
+
 fn yaml_key(key: &str) -> serde_yaml::Value {
     serde_yaml::Value::String(key.to_string())
 }
@@ -3416,6 +3436,34 @@ fn merge_hermes_compression_config(
     Ok(())
 }
 
+fn build_hermes_prompt_caching_config_values(config: &serde_yaml::Value) -> Value {
+    let root = config.as_mapping();
+    let prompt_caching = root.and_then(|map| yaml_get_mapping(map, "prompt_caching"));
+    serde_json::json!({
+        "promptCacheTtl": normalize_hermes_prompt_cache_ttl(
+            prompt_caching.and_then(|map| yaml_string_field(map, "cache_ttl")),
+            false,
+        ).unwrap_or_else(|_| "5m".to_string()),
+    })
+}
+
+fn merge_hermes_prompt_caching_config(
+    config: &mut serde_yaml::Value,
+    form: &Value,
+) -> Result<(), String> {
+    let current = build_hermes_prompt_caching_config_values(config);
+    let cache_ttl = normalize_hermes_prompt_cache_ttl(
+        form_string(form, "promptCacheTtl")
+            .or_else(|| current["promptCacheTtl"].as_str().map(ToString::to_string)),
+        true,
+    )?;
+
+    let root = ensure_yaml_object(config)?;
+    let prompt_caching = yaml_child_object(root, "prompt_caching")?;
+    prompt_caching.insert(yaml_key("cache_ttl"), serde_yaml::Value::String(cache_ttl));
+    Ok(())
+}
+
 fn build_hermes_tool_loop_guardrails_config_values(config: &serde_yaml::Value) -> Value {
     let root = config.as_mapping();
     let guardrails = root.and_then(|map| yaml_get_mapping(map, "tool_loop_guardrails"));
@@ -6798,6 +6846,30 @@ pub fn hermes_compression_config_save(form: Value) -> Result<Value, String> {
     }))
 }
 
+#[tauri::command]
+pub fn hermes_prompt_caching_config_read() -> Result<Value, String> {
+    let (config_path, exists, config) = read_hermes_channel_yaml_config()?;
+    ensure_yaml_object(&mut config.clone())?;
+    Ok(serde_json::json!({
+        "exists": exists,
+        "configPath": config_path.to_string_lossy(),
+        "values": build_hermes_prompt_caching_config_values(&config),
+    }))
+}
+
+#[tauri::command]
+pub fn hermes_prompt_caching_config_save(form: Value) -> Result<Value, String> {
+    let (config_path, _exists, mut config) = read_hermes_channel_yaml_config()?;
+    merge_hermes_prompt_caching_config(&mut config, &form)?;
+    let backup = write_hermes_yaml_config(&config_path, &config)?;
+    Ok(serde_json::json!({
+        "ok": true,
+        "configPath": config_path.to_string_lossy(),
+        "backup": backup,
+        "values": build_hermes_prompt_caching_config_values(&config),
+    }))
+}
+
 #[tauri::command]
 pub fn hermes_tool_loop_guardrails_config_read() -> Result<Value, String> {
     let (config_path, exists, config) = read_hermes_channel_yaml_config()?;
@@ -12335,6 +12407,74 @@ streaming:
     }
 }
 
+#[cfg(test)]
+mod hermes_prompt_caching_config_tests {
+    use super::{build_hermes_prompt_caching_config_values, merge_hermes_prompt_caching_config};
+    use serde_json::json;
+
+    #[test]
+    fn prompt_caching_values_have_upstream_defaults() {
+        let config: serde_yaml::Value = serde_yaml::from_str("{}").unwrap();
+        let values = build_hermes_prompt_caching_config_values(&config);
+        assert_eq!(values["promptCacheTtl"], "5m");
+    }
+
+    #[test]
+    fn prompt_caching_values_normalize_existing_ttl() {
+        let config: serde_yaml::Value = serde_yaml::from_str(
+            r#"
+prompt_caching:
+  cache_ttl: "1H"
+"#,
+        )
+        .unwrap();
+
+        let values = build_hermes_prompt_caching_config_values(&config);
+        assert_eq!(values["promptCacheTtl"], "1h");
+    }
+
+    #[test]
+    fn merge_prompt_caching_config_preserves_unrelated_yaml() {
+        let mut config: serde_yaml::Value = serde_yaml::from_str(
+            r#"
+model:
+  provider: anthropic
+prompt_caching:
+  cache_ttl: 5m
+  custom_flag: keep-prompt-cache
+compression:
+  enabled: true
+"#,
+        )
+        .unwrap();
+
+        merge_hermes_prompt_caching_config(
+            &mut config,
+            &json!({
+                "promptCacheTtl": "1h",
+            }),
+        )
+        .unwrap();
+
+        assert_eq!(config["model"]["provider"].as_str(), Some("anthropic"));
+        assert_eq!(config["compression"]["enabled"].as_bool(), Some(true));
+        assert_eq!(config["prompt_caching"]["cache_ttl"].as_str(), Some("1h"));
+        assert_eq!(
+            config["prompt_caching"]["custom_flag"].as_str(),
+            Some("keep-prompt-cache")
+        );
+    }
+
+    #[test]
+    fn merge_prompt_caching_config_rejects_invalid_ttl() {
+        let mut config: serde_yaml::Value = serde_yaml::from_str("{}").unwrap();
+        let err =
+            merge_hermes_prompt_caching_config(&mut config, &json!({ "promptCacheTtl": "30m" }))
+                .unwrap_err();
+        assert!(err.contains("prompt_caching.cache_ttl"));
+    }
+}
+
 #[cfg(test)]
 mod hermes_tool_loop_guardrails_config_tests {
     use super::{
diff --git a/src-tauri/src/lib.rs b/src-tauri/src/lib.rs
index 8856dab..0f9924b 100644
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@@ -261,6 +261,8 @@ pub fn run() {
             hermes::hermes_session_runtime_config_save,
             hermes::hermes_compression_config_read,
             hermes::hermes_compression_config_save,
+            hermes::hermes_prompt_caching_config_read,
+            hermes::hermes_prompt_caching_config_save,
             hermes::hermes_tool_loop_guardrails_config_read,
             hermes::hermes_tool_loop_guardrails_config_save,
             hermes::hermes_memory_config_read,
diff --git a/src/engines/hermes/pages/config.js b/src/engines/hermes/pages/config.js
index 93d58ca..c9851af 100644
--- a/src/engines/hermes/pages/config.js
+++ b/src/engines/hermes/pages/config.js
@@ -23,6 +23,10 @@ const COMPRESSION_DEFAULTS = {
   abortOnSummaryFailure: false,
 }
 
+const PROMPT_CACHING_DEFAULTS = {
+  promptCacheTtl: '5m',
+}
+
 const TOOL_GUARDRAILS_DEFAULTS = {
   warningsEnabled: true,
   hardStopEnabled: false,
@@ -205,6 +209,7 @@ const HUMAN_DELAY_MODES = ['off', 'natural', 'custom']
 const APPROVAL_MODES = ['manual', 'smart', 'off']
 const APPROVAL_CRON_MODES = ['deny', 'approve']
 const LOGGING_LEVELS = ['DEBUG', 'INFO', 'WARNING']
+const PROMPT_CACHE_TTLS = ['5m', '1h']
 
 export function render() {
   const el = document.createElement('div')
@@ -213,6 +218,7 @@ export function render() {
   let yaml = ''
   let runtimeValues = { ...SESSION_RUNTIME_DEFAULTS }
   let compressionValues = { ...COMPRESSION_DEFAULTS }
+  let promptCachingValues = { ...PROMPT_CACHING_DEFAULTS }
   let toolGuardrailsValues = { ...TOOL_GUARDRAILS_DEFAULTS }
   let memoryValues = { ...MEMORY_DEFAULTS }
   let skillsValues = { ...SKILLS_DEFAULTS }
@@ -236,6 +242,7 @@ export function render() {
   let loading = true
   let runtimeLoading = true
   let compressionLoading = true
+  let promptCachingLoading = true
   let toolGuardrailsLoading = true
   let memoryLoading = true
   let skillsLoading = true
@@ -259,6 +266,7 @@ export function render() {
   let saving = false
   let runtimeSaving = false
   let compressionSaving = false
+  let promptCachingSaving = false
   let toolGuardrailsSaving = false
   let memorySaving = false
   let skillsSaving = false
@@ -282,6 +290,7 @@ export function render() {
   let error = null
   let runtimeError = null
   let compressionError = null
+  let promptCachingError = null
   let toolGuardrailsError = null
   let memoryError = null
   let skillsError = null
@@ -312,7 +321,7 @@ export function render() {
   }
 
   function isBusy() {
-    return loading || runtimeLoading || compressionLoading || toolGuardrailsLoading || memoryLoading || skillsLoading || quickCommandsLoading || agentToolsetsLoading || agentRuntimeLoading || unauthorizedDmLoading || securityLoading || displayLoading || humanDelayLoading || streamingLoading || executionLimitsLoading || ioSafetyLoading || checkpointsLoading || cronLoading || loggingLoading || approvalsLoading || privacyLoading || browserLoading || terminalLoading || saving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || securitySaving || displaySaving || humanDelaySaving || streamingSaving || executionLimitsSaving || ioSafetySaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || privacySaving || browserSaving || terminalSaving
+    return loading || runtimeLoading || compressionLoading || promptCachingLoading || toolGuardrailsLoading || memoryLoading || skillsLoading || quickCommandsLoading || agentToolsetsLoading || agentRuntimeLoading || unauthorizedDmLoading || securityLoading || displayLoading || humanDelayLoading || streamingLoading || executionLimitsLoading || ioSafetyLoading || checkpointsLoading || cronLoading || loggingLoading || approvalsLoading || privacyLoading || browserLoading || terminalLoading || saving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || securitySaving || displaySaving || humanDelaySaving || streamingSaving || executionLimitsSaving || ioSafetySaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || privacySaving || browserSaving || terminalSaving
   }
 
   function option(labelKey, value, selected) {
@@ -329,7 +338,7 @@ export function render() {
   }
 
   function renderRuntimePanel() {
-    const disabled = loading || saving || runtimeLoading || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    const disabled = loading || saving || runtimeLoading || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel">
         <div class="hm-panel-header">
@@ -377,7 +386,7 @@ export function render() {
   }
 
   function renderCompressionPanel() {
-    const disabled = loading || saving || compressionLoading || compressionSaving || runtimeSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    const disabled = loading || saving || compressionLoading || compressionSaving || promptCachingSaving || runtimeSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-compression-panel">
         <div class="hm-panel-header">
@@ -426,8 +435,38 @@ export function render() {
     `
   }
 
+  function renderPromptCachingPanel() {
+    const disabled = loading || saving || promptCachingLoading || promptCachingSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    return `
+      <div class="hm-panel hm-config-runtime-panel hm-config-prompt-caching-panel">
+        <div class="hm-panel-header">
+          <div>
+            <div class="hm-panel-title">${t('engine.hermesPromptCachingConfigTitle')}</div>
+            <div class="hm-channel-panel-desc">${t('engine.hermesPromptCachingConfigDesc')}</div>
+          </div>
+          <div class="hm-panel-actions">
+            <span class="hm-muted">${promptCachingSaving ? t('engine.hermesConfigStatusSaving') : promptCachingLoading ? t('engine.hermesConfigStatusLoading') : t('engine.hermesPromptCachingConfigStatusReady')}</span>
+            <button class="hm-btn hm-btn--cta hm-btn--sm" id="hm-prompt-caching-save" ${disabled ? 'disabled' : ''}>${t('engine.hermesPromptCachingConfigSave')}</button>
+          </div>
+        </div>
+        <div class="hm-panel-body">
+          ${renderError(promptCachingError)}
+          <div class="hm-config-runtime-grid">
+            <label class="hm-field">
+              <span class="hm-field-label">${t('engine.hermesPromptCachingConfigCacheTtl')}</span>
+              <select id="hm-prompt-cache-ttl" class="hm-input" ${disabled ? 'disabled' : ''}>
+                ${PROMPT_CACHE_TTLS.map(ttl => option(`engine.hermesPromptCachingConfigCacheTtl_${ttl}`, ttl, promptCachingValues.promptCacheTtl)).join('')}
+              </select>
+            </label>
+          </div>
+          <div class="hm-channel-footnote">${t('engine.hermesPromptCachingConfigFootnote')}</div>
+        </div>
+      </div>
+    `
+  }
+
   function renderToolGuardrailsPanel() {
-    const disabled = loading || saving || toolGuardrailsLoading || toolGuardrailsSaving || runtimeSaving || compressionSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    const disabled = loading || saving || toolGuardrailsLoading || toolGuardrailsSaving || runtimeSaving || compressionSaving || promptCachingSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-guardrails-panel">
         <div class="hm-panel-header">
@@ -489,7 +528,7 @@ export function render() {
   }
 
   function renderMemoryPanel() {
-    const disabled = loading || saving || memoryLoading || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    const disabled = loading || saving || memoryLoading || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-memory-panel">
         <div class="hm-panel-header">
@@ -539,7 +578,7 @@ export function render() {
   }
 
   function renderSkillsConfigPanel() {
-    const disabled = loading || saving || skillsLoading || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    const disabled = loading || saving || skillsLoading || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-skills-panel">
         <div class="hm-panel-header">
@@ -571,7 +610,7 @@ export function render() {
   }
 
   function renderQuickCommandsConfigPanel() {
-    const disabled = loading || saving || quickCommandsLoading || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    const disabled = loading || saving || quickCommandsLoading || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-quick-commands-panel">
         <div class="hm-panel-header">
@@ -597,7 +636,7 @@ export function render() {
   }
 
   function renderAgentToolsetsConfigPanel() {
-    const disabled = loading || saving || agentToolsetsLoading || agentToolsetsSaving || agentRuntimeSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    const disabled = loading || saving || agentToolsetsLoading || agentToolsetsSaving || agentRuntimeSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-agent-toolsets-panel">
         <div class="hm-panel-header">
@@ -623,7 +662,7 @@ export function render() {
   }
 
   function renderAgentRuntimeConfigPanel() {
-    const disabled = loading || saving || agentRuntimeLoading || agentRuntimeSaving || agentToolsetsSaving || unauthorizedDmSaving || securitySaving || displaySaving || humanDelaySaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || streamingSaving || executionLimitsSaving || ioSafetySaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || privacySaving || browserSaving || terminalSaving
+    const disabled = loading || saving || agentRuntimeLoading || agentRuntimeSaving || agentToolsetsSaving || unauthorizedDmSaving || securitySaving || displaySaving || humanDelaySaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || streamingSaving || executionLimitsSaving || ioSafetySaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || privacySaving || browserSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-agent-runtime-panel">
         <div class="hm-panel-header">
@@ -685,7 +724,7 @@ export function render() {
   }
 
   function renderUnauthorizedDmConfigPanel() {
-    const disabled = loading || saving || unauthorizedDmLoading || unauthorizedDmSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || securitySaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    const disabled = loading || saving || unauthorizedDmLoading || unauthorizedDmSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || securitySaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-unauthorized-dm-panel">
         <div class="hm-panel-header">
@@ -715,7 +754,7 @@ export function render() {
   }
 
   function renderSecurityConfigPanel() {
-    const disabled = loading || saving || securityLoading || securitySaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    const disabled = loading || saving || securityLoading || securitySaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-security-panel">
         <div class="hm-panel-header">
@@ -757,7 +796,7 @@ export function render() {
   }
 
   function renderDisplayConfigPanel() {
-    const disabled = loading || saving || displayLoading || displaySaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || securitySaving || humanDelaySaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    const disabled = loading || saving || displayLoading || displaySaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || securitySaving || humanDelaySaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-display-panel">
         <div class="hm-panel-header">
@@ -855,7 +894,7 @@ export function render() {
   }
 
   function renderHumanDelayConfigPanel() {
-    const disabled = loading || saving || humanDelayLoading || humanDelaySaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || securitySaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    const disabled = loading || saving || humanDelayLoading || humanDelaySaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || securitySaving || streamingSaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-human-delay-panel">
         <div class="hm-panel-header">
@@ -893,7 +932,7 @@ export function render() {
   }
 
   function renderStreamingPanel() {
-    const disabled = loading || saving || streamingLoading || streamingSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || securitySaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
+    const disabled = loading || saving || streamingLoading || streamingSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || securitySaving || executionLimitsSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-streaming-panel">
         <div class="hm-panel-header">
@@ -945,7 +984,7 @@ export function render() {
   }
 
   function renderExecutionLimitsPanel() {
-    const disabled = loading || saving || executionLimitsLoading || executionLimitsSaving || terminalSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving
+    const disabled = loading || saving || executionLimitsLoading || executionLimitsSaving || terminalSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-execution-limits-panel">
         <div class="hm-panel-header">
@@ -1017,7 +1056,7 @@ export function render() {
   }
 
   function renderIoSafetyPanel() {
-    const disabled = loading || saving || ioSafetyLoading || ioSafetySaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving
+    const disabled = loading || saving || ioSafetyLoading || ioSafetySaving || checkpointsSaving || cronSaving || loggingSaving || approvalsSaving || terminalSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-io-safety-panel">
         <div class="hm-panel-header">
@@ -1057,7 +1096,7 @@ export function render() {
   }
 
   function renderCheckpointsPanel() {
-    const disabled = loading || saving || checkpointsLoading || checkpointsSaving || ioSafetySaving || cronSaving || loggingSaving || approvalsSaving || privacySaving || browserSaving || terminalSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving
+    const disabled = loading || saving || checkpointsLoading || checkpointsSaving || ioSafetySaving || cronSaving || loggingSaving || approvalsSaving || privacySaving || browserSaving || terminalSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-checkpoints-panel">
         <div class="hm-panel-header">
@@ -1115,7 +1154,7 @@ export function render() {
   }
 
   function renderCronPanel() {
-    const disabled = loading || saving || cronLoading || cronSaving || checkpointsSaving || loggingSaving || approvalsSaving || privacySaving || browserSaving || terminalSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || ioSafetySaving
+    const disabled = loading || saving || cronLoading || cronSaving || checkpointsSaving || loggingSaving || approvalsSaving || privacySaving || browserSaving || terminalSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || ioSafetySaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-cron-panel">
         <div class="hm-panel-header">
@@ -1149,7 +1188,7 @@ export function render() {
   }
 
   function renderLoggingPanel() {
-    const disabled = loading || saving || loggingLoading || loggingSaving || checkpointsSaving || cronSaving || approvalsSaving || privacySaving || browserSaving || terminalSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || ioSafetySaving
+    const disabled = loading || saving || loggingLoading || loggingSaving || checkpointsSaving || cronSaving || approvalsSaving || privacySaving || browserSaving || terminalSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || ioSafetySaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-logging-panel">
         <div class="hm-panel-header">
@@ -1197,7 +1236,7 @@ export function render() {
   }
 
   function renderApprovalsPanel() {
-    const disabled = loading || saving || approvalsLoading || approvalsSaving || checkpointsSaving || cronSaving || loggingSaving || privacySaving || browserSaving || terminalSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || ioSafetySaving
+    const disabled = loading || saving || approvalsLoading || approvalsSaving || checkpointsSaving || cronSaving || loggingSaving || privacySaving || browserSaving || terminalSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || ioSafetySaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-approvals-panel">
         <div class="hm-panel-header">
@@ -1247,7 +1286,7 @@ export function render() {
   }
 
   function renderPrivacyPanel() {
-    const disabled = loading || saving || privacyLoading || privacySaving || approvalsSaving || cronSaving || loggingSaving || browserSaving || terminalSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || ioSafetySaving || checkpointsSaving
+    const disabled = loading || saving || privacyLoading || privacySaving || approvalsSaving || cronSaving || loggingSaving || browserSaving || terminalSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || ioSafetySaving || checkpointsSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-privacy-panel">
         <div class="hm-panel-header">
@@ -1275,7 +1314,7 @@ export function render() {
   }
 
   function renderBrowserPanel() {
-    const disabled = loading || saving || browserLoading || browserSaving || approvalsSaving || cronSaving || loggingSaving || privacySaving || terminalSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || ioSafetySaving || checkpointsSaving
+    const disabled = loading || saving || browserLoading || browserSaving || approvalsSaving || cronSaving || loggingSaving || privacySaving || terminalSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || ioSafetySaving || checkpointsSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-browser-panel">
         <div class="hm-panel-header">
@@ -1319,7 +1358,7 @@ export function render() {
   }
 
   function renderTerminalPanel() {
-    const disabled = loading || saving || terminalLoading || terminalSaving || approvalsSaving || cronSaving || loggingSaving || browserSaving || runtimeSaving || compressionSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving
+    const disabled = loading || saving || terminalLoading || terminalSaving || approvalsSaving || cronSaving || loggingSaving || browserSaving || runtimeSaving || compressionSaving || promptCachingSaving || toolGuardrailsSaving || memorySaving || skillsSaving || quickCommandsSaving || agentToolsetsSaving || agentRuntimeSaving || unauthorizedDmSaving || streamingSaving || executionLimitsSaving || checkpointsSaving
     return `
       <div class="hm-panel hm-config-runtime-panel hm-config-terminal-panel">
         <div class="hm-panel-header">
@@ -1415,6 +1454,7 @@ export function render() {
       ${renderPrivacyPanel()}
       ${renderBrowserPanel()}
       ${renderCompressionPanel()}
+      ${renderPromptCachingPanel()}
       ${renderToolGuardrailsPanel()}
       ${renderMemoryPanel()}
       ${renderSkillsConfigPanel()}
@@ -1446,6 +1486,7 @@ export function render() {
     el.querySelector('#hm-config-save')?.addEventListener('click', save)
     el.querySelector('#hm-runtime-save')?.addEventListener('click', saveRuntime)
     el.querySelector('#hm-compression-save')?.addEventListener('click', saveCompression)
+    el.querySelector('#hm-prompt-caching-save')?.addEventListener('click', savePromptCaching)
     el.querySelector('#hm-tool-guardrails-save')?.addEventListener('click', saveToolGuardrails)
     el.querySelector('#hm-memory-save')?.addEventListener('click', saveMemory)
     el.querySelector('#hm-skills-config-save')?.addEventListener('click', saveSkillsConfig)
@@ -1483,6 +1524,11 @@ export function render() {
     compressionValues = { ...COMPRESSION_DEFAULTS, ...(data?.values || {}) }
   }
 
+  async function loadPromptCaching() {
+    const data = await api.hermesPromptCachingConfigRead()
+    promptCachingValues = { ...PROMPT_CACHING_DEFAULTS, ...(data?.values || {}) }
+  }
+
   async function loadToolGuardrails() {
     const data = await api.hermesToolLoopGuardrailsConfigRead()
     toolGuardrailsValues = { ...TOOL_GUARDRAILS_DEFAULTS, ...(data?.values || {}) }
@@ -1587,6 +1633,7 @@ export function render() {
     loading = true
     runtimeLoading = true
     compressionLoading = true
+    promptCachingLoading = true
     toolGuardrailsLoading = true
     memoryLoading = true
     skillsLoading = true
@@ -1610,6 +1657,7 @@ export function render() {
     error = null
     runtimeError = null
     compressionError = null
+    promptCachingError = null
     toolGuardrailsError = null
     memoryError = null
     skillsError = null
@@ -1654,6 +1702,14 @@ export function render() {
       compressionLoading = false
       draw()
     }
+    try {
+      await loadPromptCaching()
+    } catch (err) {
+      promptCachingError = humanizeError(err, t('engine.hermesPromptCachingConfigLoadFailed') || 'Load prompt caching config failed')
+    } finally {
+      promptCachingLoading = false
+      draw()
+    }
     try {
       await loadToolGuardrails()
     } catch (err) {
@@ -1841,6 +1897,9 @@ export function render() {
       try {
         await loadCompression()
       } catch {}
+      try {
+        await loadPromptCaching()
+      } catch {}
       try {
         await loadToolGuardrails()
       } catch {}
@@ -1969,6 +2028,31 @@ export function render() {
     }
   }
 
+  async function savePromptCaching() {
+    const form = {
+      promptCacheTtl: el.querySelector('#hm-prompt-cache-ttl')?.value || '5m',
+    }
+    promptCachingSaving = true
+    promptCachingError = null
+    draw()
+    try {
+      const result = await api.hermesPromptCachingConfigSave(form)
+      promptCachingValues = { ...PROMPT_CACHING_DEFAULTS, ...(result?.values || form) }
+      await refreshRawAfterStructuredSave()
+      const backup = result?.backup || ''
+      toast({
+        message: t('engine.hermesPromptCachingConfigSaveSuccess'),
+        hint: backup ? t('engine.hermesConfigBackupHint', { path: backup }) : '',
+      }, 'success')
+    } catch (err) {
+      promptCachingError = humanizeError(err, t('engine.hermesPromptCachingConfigSaveFailed') || 'Save prompt caching config failed')
+      toast(promptCachingError, 'error')
+    } finally {
+      promptCachingSaving = false
+      draw()
+    }
+  }
+
   async function saveToolGuardrails() {
     const form = {
       warningsEnabled: !!el.querySelector('#hm-tool-guardrails-warnings-enabled')?.checked,
diff --git a/src/lib/tauri-api.js b/src/lib/tauri-api.js
index 5d96ba4..92a30ac 100644
--- a/src/lib/tauri-api.js
+++ b/src/lib/tauri-api.js
@@ -513,6 +513,8 @@ export const api = {
   hermesSessionRuntimeConfigSave: (form) => invoke('hermes_session_runtime_config_save', { form }),
   hermesCompressionConfigRead: () => invoke('hermes_compression_config_read'),
   hermesCompressionConfigSave: (form) => invoke('hermes_compression_config_save', { form }),
+  hermesPromptCachingConfigRead: () => invoke('hermes_prompt_caching_config_read'),
+  hermesPromptCachingConfigSave: (form) => invoke('hermes_prompt_caching_config_save', { form }),
   hermesToolLoopGuardrailsConfigRead: () => invoke('hermes_tool_loop_guardrails_config_read'),
   hermesToolLoopGuardrailsConfigSave: (form) => invoke('hermes_tool_loop_guardrails_config_save', { form }),
   hermesMemoryConfigRead: () => invoke('hermes_memory_config_read'),
diff --git a/src/locales/modules/engine.js b/src/locales/modules/engine.js
index ae1cb04..cae66e2 100644
--- a/src/locales/modules/engine.js
+++ b/src/locales/modules/engine.js
@@ -674,6 +674,17 @@ export default {
   hermesCompressionProtectFirstN: _('保护开头消息数', 'Protect first messages', '保護開頭訊息數'),
   hermesCompressionAbortOnSummaryFailure: _('摘要失败时中止回复', 'Abort when summarization fails', '摘要失敗時中止回覆'),
   hermesCompressionFootnote: _('阈值和目标比例越低，压缩越早、越激进。建议先使用默认值，再根据真实 Gateway 日志调整。', 'Lower thresholds and target ratios compress earlier and more aggressively. Start with the defaults, then tune with real Gateway logs.', '閾值和目標比例越低，壓縮越早、越激進。建議先使用預設值，再根據真實 Gateway 日誌調整。'),
+  hermesPromptCachingConfigTitle: _('提示缓存', 'Prompt caching', '提示快取'),
+  hermesPromptCachingConfigDesc: _('控制 Anthropic/OpenRouter 前缀缓存 TTL。长跑任务如果回合间隔较长，可以选择 1 小时以降低重复上下文成本。', 'Control the Anthropic/OpenRouter prefix cache TTL. For long runs with longer pauses between turns, choose 1 hour to reduce repeated context cost.', '控制 Anthropic/OpenRouter 前綴快取 TTL。長跑任務如果回合間隔較長，可以選擇 1 小時以降低重複上下文成本。'),
+  hermesPromptCachingConfigStatusReady: _('结构化配置', 'structured settings', '結構化設定'),
+  hermesPromptCachingConfigSave: _('保存提示缓存', 'Save prompt caching', '儲存提示快取'),
+  hermesPromptCachingConfigSaveSuccess: _('提示缓存配置已保存，建议重启 Hermes Gateway 生效', 'Prompt caching settings saved. Restart Hermes Gateway to take effect.', '提示快取設定已儲存，建議重啟 Hermes Gateway 生效'),
+  hermesPromptCachingConfigLoadFailed: _('加载提示缓存配置失败', 'Load prompt caching settings failed', '載入提示快取設定失敗'),
+  hermesPromptCachingConfigSaveFailed: _('保存提示缓存配置失败', 'Save prompt caching settings failed', '儲存提示快取設定失敗'),
+  hermesPromptCachingConfigCacheTtl: _('缓存有效期', 'Cache TTL', '快取有效期'),
+  hermesPromptCachingConfigCacheTtl_5m: _('5 分钟（默认）', '5 minutes (default)', '5 分鐘（預設）'),
+  hermesPromptCachingConfigCacheTtl_1h: _('1 小时（长跑）', '1 hour (long runs)', '1 小時（長跑）'),
+  hermesPromptCachingConfigFootnote: _('这里写入 prompt_caching.cache_ttl。上游仅支持 5m 和 1h；其他 prompt_caching 高级字段会保留在 raw YAML 中。', 'This writes prompt_caching.cache_ttl. Upstream only supports 5m and 1h; other advanced prompt_caching fields stay in raw YAML.', '這裡寫入 prompt_caching.cache_ttl。上游僅支援 5m 和 1h；其他 prompt_caching 進階欄位會保留在 raw YAML 中。'),
   hermesToolGuardrailsTitle: _('工具循环防护', 'Tool loop guardrails', '工具循環防護'),
   hermesToolGuardrailsDesc: _('当 Agent 重复失败或反复执行无进展工具时，先给模型修正提示；开启硬停止后可主动中止失控循环。', 'Warn the model when tools repeat failures or make no progress. Enable hard stops to halt runaway loops before they spend the full turn budget.', '當 Agent 重複失敗或反覆執行無進展工具時，先給模型修正提示；啟用硬停止後可主動中止失控循環。'),
   hermesToolGuardrailsStatusReady: _('结构化配置', 'structured settings', '結構化設定'),
diff --git a/tests/hermes-config-page-ui.test.js b/tests/hermes-config-page-ui.test.js
index 6430f00..a29566b 100644
--- a/tests/hermes-config-page-ui.test.js
+++ b/tests/hermes-config-page-ui.test.js
@@ -139,6 +139,15 @@ test('Hermes 配置页会暴露全局显示与可靠性结构化配置字段', (
   }
 })
 
+test('Hermes 配置页会暴露提示缓存结构化配置字段', () => {
+  for (const id of [
+    'hm-prompt-caching-save',
+    'hm-prompt-cache-ttl',
+  ]) {
+    assert.match(source, new RegExp(`id="${id}"`), `缺少 ${id}`)
+  }
+})
+
 test('Hermes 配置页会暴露网关流式结构化配置字段', () => {
   for (const id of [
     'hm-streaming-save',
@@ -290,6 +299,7 @@ test('Hermes 配置页新增结构化配置不会暴露翻译 key', () => {
     key.includes('SecurityConfig') ||
     key.includes('HumanDelayConfig') ||
     key.includes('DisplayConfig') ||
+    key.includes('PromptCachingConfig') ||
     key.includes('StreamingConfig') ||
     key.includes('ExecutionLimits') ||
     key.includes('PrivacyConfig') ||
diff --git a/tests/hermes-prompt-caching-config.test.js b/tests/hermes-prompt-caching-config.test.js
new file mode 100644
index 0000000..0a6271f
--- /dev/null
+++ b/tests/hermes-prompt-caching-config.test.js
@@ -0,0 +1,50 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+
+import {
+  buildHermesPromptCachingConfigValues,
+  mergeHermesPromptCachingConfig,
+} from '../scripts/dev-api.js'
+
+test('Hermes 提示缓存配置读取会提供上游默认 TTL', () => {
+  const values = buildHermesPromptCachingConfigValues({})
+
+  assert.deepEqual(values, {
+    promptCacheTtl: '5m',
+  })
+})
+
+test('Hermes 提示缓存配置读取会规范化 YAML 中的 TTL', () => {
+  const values = buildHermesPromptCachingConfigValues({
+    prompt_caching: {
+      cache_ttl: '1H',
+    },
+  })
+
+  assert.equal(values.promptCacheTtl, '1h')
+})
+
+test('Hermes 提示缓存配置保存会保留无关 YAML 和未知字段', () => {
+  const next = mergeHermesPromptCachingConfig({
+    model: { provider: 'anthropic' },
+    prompt_caching: {
+      cache_ttl: '5m',
+      custom_flag: 'keep-prompt-cache',
+    },
+    compression: { enabled: true },
+  }, {
+    promptCacheTtl: '1h',
+  })
+
+  assert.deepEqual(next.model, { provider: 'anthropic' })
+  assert.deepEqual(next.compression, { enabled: true })
+  assert.equal(next.prompt_caching.cache_ttl, '1h')
+  assert.equal(next.prompt_caching.custom_flag, 'keep-prompt-cache')
+})
+
+test('Hermes 提示缓存配置保存会拒绝上游不支持的 TTL', () => {
+  assert.throws(
+    () => mergeHermesPromptCachingConfig({}, { promptCacheTtl: '30m' }),
+    /prompt_caching\.cache_ttl/,
+  )
+})