diff --git a/.github/workflows/_harness-e2e.yml b/.github/workflows/_harness-e2e.yml
index f939882e6..6f79ec647 100644
--- a/.github/workflows/_harness-e2e.yml
+++ b/.github/workflows/_harness-e2e.yml
@@ -95,6 +95,8 @@ on:
         required: false
       zai_api_key:
         required: false
+      deepseek_api_key:
+        required: false
 
 jobs:
   build:
@@ -214,6 +216,7 @@ jobs:
             provider-openai-codex -> target
             provider-claude-code -> target
             provider-zai -> target
+            provider-deepseek -> target
             context-manager -> target
             iii-directory -> target
             cron -> target
@@ -378,6 +381,7 @@ jobs:
           ANTHROPIC_API_KEY: ${{ secrets.anthropic_api_key }}
           OPENAI_API_KEY: ${{ secrets.openai_api_key }}
           ZAI_API_KEY: ${{ secrets.zai_api_key }}
+          DEEPSEEK_API_KEY: ${{ secrets.deepseek_api_key }}
           III_BIN: ${{ github.workspace }}/${{ needs.build.outputs.engine_binary }}
           HARNESS_E2E_BIN: ${{ github.workspace }}/harness/target/release/harness-e2e
           HARNESS_E2E_ARTIFACTS_DIR: ${{ github.workspace }}/target/harness-e2e
@@ -400,6 +404,7 @@ jobs:
           ANTHROPIC_API_KEY: ${{ secrets.anthropic_api_key }}
           OPENAI_API_KEY: ${{ secrets.openai_api_key }}
           ZAI_API_KEY: ${{ secrets.zai_api_key }}
+          DEEPSEEK_API_KEY: ${{ secrets.deepseek_api_key }}
           III_CLI_CHANNEL: ${{ inputs.cli_channel }}
           III_WORKER_TAG: ${{ inputs.registry_tag }}
           HARNESS_E2E_RELEASE_WORKER: ${{ inputs.release_worker }}
diff --git a/.github/workflows/harness-e2e-daily.yml b/.github/workflows/harness-e2e-daily.yml
index 112459868..cae928fc8 100644
--- a/.github/workflows/harness-e2e-daily.yml
+++ b/.github/workflows/harness-e2e-daily.yml
@@ -84,6 +84,7 @@ jobs:
       anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
       openai_api_key: ${{ secrets.OPENAI_API_KEY }}
       zai_api_key: ${{ secrets.ZAI_API_KEY }}
+      deepseek_api_key: ${{ secrets.DEEPSEEK_API_KEY }}
 
   integration:
     needs: context
diff --git a/.github/workflows/harness-e2e-deployed.yml b/.github/workflows/harness-e2e-deployed.yml
index 556e127b9..ecfe4ad87 100644
--- a/.github/workflows/harness-e2e-deployed.yml
+++ b/.github/workflows/harness-e2e-deployed.yml
@@ -82,3 +82,4 @@ jobs:
       anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
       openai_api_key: ${{ secrets.OPENAI_API_KEY }}
       zai_api_key: ${{ secrets.ZAI_API_KEY }}
+      deepseek_api_key: ${{ secrets.DEEPSEEK_API_KEY }}
diff --git a/.github/workflows/harness-e2e-main.yml b/.github/workflows/harness-e2e-main.yml
index ea5a03b42..a19d40be3 100644
--- a/.github/workflows/harness-e2e-main.yml
+++ b/.github/workflows/harness-e2e-main.yml
@@ -51,3 +51,4 @@ jobs:
       anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
       openai_api_key: ${{ secrets.OPENAI_API_KEY }}
       zai_api_key: ${{ secrets.ZAI_API_KEY }}
+      deepseek_api_key: ${{ secrets.DEEPSEEK_API_KEY }}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 10ec66827..20898b05a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -351,6 +351,7 @@ jobs:
       anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
       openai_api_key: ${{ secrets.OPENAI_API_KEY }}
       zai_api_key: ${{ secrets.ZAI_API_KEY }}
+      deepseek_api_key: ${{ secrets.DEEPSEEK_API_KEY }}
 
   candidate-ready:
     name: Record candidate evidence