diff --git a/packages/adapter-utils/src/types.ts b/packages/adapter-utils/src/types.ts
index 6d5442aa..a1862f7f 100644
--- a/packages/adapter-utils/src/types.ts
+++ b/packages/adapter-utils/src/types.ts
@@ -157,6 +157,7 @@ export interface CLIAdapterModule {
 export interface CreateConfigValues {
   adapterType: string;
   cwd: string;
+  instructionsFilePath?: string;
   promptTemplate: string;
   model: string;
   thinkingEffort: string;
diff --git a/packages/adapters/claude-local/src/index.ts b/packages/adapters/claude-local/src/index.ts
index b9f09555..464a0d7c 100644
--- a/packages/adapters/claude-local/src/index.ts
+++ b/packages/adapters/claude-local/src/index.ts
@@ -13,6 +13,7 @@ Adapter: claude_local
 
 Core fields:
 - cwd (string, optional): default absolute working directory fallback for the agent process
+- instructionsFilePath (string, optional): absolute path to a markdown instructions file injected at runtime
 - model (string, optional): Claude model id
 - effort (string, optional): reasoning effort passed via --effort (low|medium|high)
 - chrome (boolean, optional): pass --chrome when running Claude
diff --git a/packages/adapters/claude-local/src/ui/build-config.ts b/packages/adapters/claude-local/src/ui/build-config.ts
index 41c4f036..db6d9837 100644
--- a/packages/adapters/claude-local/src/ui/build-config.ts
+++ b/packages/adapters/claude-local/src/ui/build-config.ts
@@ -53,6 +53,7 @@ function parseEnvBindings(bindings: unknown): Record<string, unknown> {
 export function buildClaudeLocalConfig(v: CreateConfigValues): Record<string, unknown> {
   const ac: Record<string, unknown> = {};
   if (v.cwd) ac.cwd = v.cwd;
+  if (v.instructionsFilePath) ac.instructionsFilePath = v.instructionsFilePath;
   if (v.promptTemplate) ac.promptTemplate = v.promptTemplate;
   if (v.bootstrapPrompt) ac.bootstrapPromptTemplate = v.bootstrapPrompt;
   if (v.model) ac.model = v.model;
diff --git a/packages/adapters/codex-local/src/index.ts b/packages/adapters/codex-local/src/index.ts
index dc943cc4..79c8219b 100644
--- a/packages/adapters/codex-local/src/index.ts
+++ b/packages/adapters/codex-local/src/index.ts
@@ -19,6 +19,7 @@ Adapter: codex_local
 
 Core fields:
 - cwd (string, optional): default absolute working directory fallback for the agent process
+- instructionsFilePath (string, optional): absolute path to a markdown instructions file prepended to stdin prompt at runtime
 - model (string, optional): Codex model id
 - modelReasoningEffort (string, optional): reasoning effort override (minimal|low|medium|high) passed via -c model_reasoning_effort=...
 - promptTemplate (string, optional): run prompt template
diff --git a/packages/adapters/codex-local/src/ui/build-config.ts b/packages/adapters/codex-local/src/ui/build-config.ts
index 645a2f86..d5cd6f04 100644
--- a/packages/adapters/codex-local/src/ui/build-config.ts
+++ b/packages/adapters/codex-local/src/ui/build-config.ts
@@ -53,6 +53,7 @@ function parseEnvBindings(bindings: unknown): Record<string, unknown> {
 export function buildCodexLocalConfig(v: CreateConfigValues): Record<string, unknown> {
   const ac: Record<string, unknown> = {};
   if (v.cwd) ac.cwd = v.cwd;
+  if (v.instructionsFilePath) ac.instructionsFilePath = v.instructionsFilePath;
   if (v.promptTemplate) ac.promptTemplate = v.promptTemplate;
   if (v.bootstrapPrompt) ac.bootstrapPromptTemplate = v.bootstrapPrompt;
   if (v.model) ac.model = v.model;