diff --git a/crates/owlen-core/Cargo.toml b/crates/owlen-core/Cargo.toml
index 8298a68..2f728bc 100644
--- a/crates/owlen-core/Cargo.toml
+++ b/crates/owlen-core/Cargo.toml
@@ -49,3 +49,4 @@ ollama-rs = { version = "0.3", features = ["stream", "headers"] }
 [dev-dependencies]
 tokio-test = { workspace = true }
 httpmock = "0.7"
+wiremock = "0.6"
diff --git a/crates/owlen-core/tests/fixtures/README.md b/crates/owlen-core/tests/fixtures/README.md
new file mode 100644
index 0000000..95ef053
--- /dev/null
+++ b/crates/owlen-core/tests/fixtures/README.md
@@ -0,0 +1,11 @@
+# Integration Fixtures
+
+This directory holds canned Ollama responses used by the Wiremock-backed
+integration tests in `ollama_wiremock.rs`.  Each file mirrors the JSON payloads
+served by the real Ollama HTTP API so the tests can stub
+`/api/tags`, `/api/chat`, and `/v1/web/search` without contacting the network.
+
+- `ollama_tags.json` – minimal model listing shared by the local and cloud scenarios.
+- `ollama_local_completion.json` – non-streaming completion for the local provider.
+- `ollama_cloud_tool_call.json` – first chat turn that requests the `web_search` tool.
+- `ollama_cloud_final.json` – follow-up completion after the tool result is injected.
diff --git a/crates/owlen-core/tests/fixtures/ollama_cloud_final.json b/crates/owlen-core/tests/fixtures/ollama_cloud_final.json
new file mode 100644
index 0000000..ff8edf9
--- /dev/null
+++ b/crates/owlen-core/tests/fixtures/ollama_cloud_final.json
@@ -0,0 +1,18 @@
+{
+  "model": "llama3:8b-cloud",
+  "created_at": "2025-10-23T12:05:05Z",
+  "message": {
+    "role": "assistant",
+    "content": "Rust 1.85 shipped today. Summarising the highlights now.",
+    "tool_calls": []
+  },
+  "done": true,
+  "final_data": {
+    "total_duration": 2500000000,
+    "load_duration": 60000000,
+    "prompt_eval_count": 64,
+    "prompt_eval_duration": 420000000,
+    "eval_count": 48,
+    "eval_duration": 520000000
+  }
+}
diff --git a/crates/owlen-core/tests/fixtures/ollama_cloud_tool_call.json b/crates/owlen-core/tests/fixtures/ollama_cloud_tool_call.json
new file mode 100644
index 0000000..48ca5e8
--- /dev/null
+++ b/crates/owlen-core/tests/fixtures/ollama_cloud_tool_call.json
@@ -0,0 +1,20 @@
+{
+  "model": "llama3:8b-cloud",
+  "created_at": "2025-10-23T12:05:00Z",
+  "message": {
+    "role": "assistant",
+    "content": "Let me check the latest Rust updates.",
+    "tool_calls": [
+      {
+        "function": {
+          "name": "web_search",
+          "arguments": {
+            "query": "latest Rust release",
+            "max_results": 5
+          }
+        }
+      }
+    ]
+  },
+  "done": false
+}
diff --git a/crates/owlen-core/tests/fixtures/ollama_local_completion.json b/crates/owlen-core/tests/fixtures/ollama_local_completion.json
new file mode 100644
index 0000000..edfac1d
--- /dev/null
+++ b/crates/owlen-core/tests/fixtures/ollama_local_completion.json
@@ -0,0 +1,18 @@
+{
+  "model": "local-mini",
+  "created_at": "2025-10-23T12:00:00Z",
+  "message": {
+    "role": "assistant",
+    "content": "Local response complete.",
+    "tool_calls": []
+  },
+  "done": true,
+  "final_data": {
+    "total_duration": 1200000000,
+    "load_duration": 50000000,
+    "prompt_eval_count": 24,
+    "prompt_eval_duration": 320000000,
+    "eval_count": 12,
+    "eval_duration": 480000000
+  }
+}
diff --git a/crates/owlen-core/tests/fixtures/ollama_tags.json b/crates/owlen-core/tests/fixtures/ollama_tags.json
new file mode 100644
index 0000000..493bdd9
--- /dev/null
+++ b/crates/owlen-core/tests/fixtures/ollama_tags.json
@@ -0,0 +1,28 @@
+{
+  "models": [
+    {
+      "name": "local-mini",
+      "size": 1048576,
+      "digest": "local-digest",
+      "modified_at": "2025-10-23T00:00:00Z",
+      "details": {
+        "format": "gguf",
+        "family": "llama3",
+        "parameter_size": "3B",
+        "quantization_level": "Q4"
+      }
+    },
+    {
+      "name": "llama3:8b-cloud",
+      "size": 8589934592,
+      "digest": "cloud-digest",
+      "modified_at": "2025-10-23T00:05:00Z",
+      "details": {
+        "format": "gguf",
+        "family": "llama3",
+        "parameter_size": "8B",
+        "quantization_level": "Q4"
+      }
+    }
+  ]
+}
diff --git a/crates/owlen-core/tests/ollama_wiremock.rs b/crates/owlen-core/tests/ollama_wiremock.rs
new file mode 100644
index 0000000..04ffbec
--- /dev/null
+++ b/crates/owlen-core/tests/ollama_wiremock.rs
@@ -0,0 +1,385 @@
+use std::sync::Arc;
+
+use owlen_core::types::{ChatParameters, Role};
+use owlen_core::{
+    Config, Provider,
+    providers::OllamaProvider,
+    session::{SessionController, SessionOutcome},
+    storage::StorageManager,
+    ui::NoOpUiController,
+};
+use serde_json::{Value, json};
+use tempfile::{TempDir, tempdir};
+use wiremock::{
+    Match, Mock, MockServer, Request, ResponseTemplate,
+    matchers::{header, method, path},
+};
+
+#[derive(Clone, Copy)]
+struct BodySubstringMatcher {
+    needle: &'static str,
+    should_contain: bool,
+}
+
+impl BodySubstringMatcher {
+    const fn contains(needle: &'static str) -> Self {
+        Self {
+            needle,
+            should_contain: true,
+        }
+    }
+
+    const fn not_contains(needle: &'static str) -> Self {
+        Self {
+            needle,
+            should_contain: false,
+        }
+    }
+}
+
+impl Match for BodySubstringMatcher {
+    fn matches(&self, request: &Request) -> bool {
+        let body_str = std::str::from_utf8(&request.body).unwrap_or_default();
+        body_str.contains(self.needle) == self.should_contain
+    }
+}
+
+fn load_fixture(name: &str) -> Value {
+    match name {
+        "ollama_tags" => serde_json::from_str(include_str!("fixtures/ollama_tags.json"))
+            .expect("valid tags fixture"),
+        "ollama_local_completion" => {
+            serde_json::from_str(include_str!("fixtures/ollama_local_completion.json"))
+                .expect("valid local completion fixture")
+        }
+        "ollama_cloud_tool_call" => {
+            serde_json::from_str(include_str!("fixtures/ollama_cloud_tool_call.json"))
+                .expect("valid cloud tool call fixture")
+        }
+        "ollama_cloud_final" => {
+            serde_json::from_str(include_str!("fixtures/ollama_cloud_final.json"))
+                .expect("valid cloud final fixture")
+        }
+        other => panic!("unknown fixture '{other}'"),
+    }
+}
+
+async fn create_session(
+    provider: Arc<dyn Provider>,
+    config: Config,
+) -> (SessionController, TempDir) {
+    let temp_dir = tempdir().expect("temp dir");
+    let storage_path = temp_dir.path().join("owlen-tests.db");
+    let storage = Arc::new(
+        StorageManager::with_database_path(storage_path)
+            .await
+            .expect("storage manager"),
+    );
+    let ui = Arc::new(NoOpUiController);
+
+    let session = SessionController::new(provider, config, storage, ui, false, None)
+        .await
+        .expect("session controller");
+    (session, temp_dir)
+}
+
+fn configure_local(base_url: &str) -> Config {
+    let mut config = Config::default();
+    config.general.default_provider = "ollama_local".into();
+    config.general.default_model = Some("local-mini".into());
+    config.general.enable_streaming = false;
+    config.privacy.encrypt_local_data = false;
+    config.privacy.require_consent_per_session = false;
+
+    if let Some(local) = config.providers.get_mut("ollama_local") {
+        local.enabled = true;
+        local.base_url = Some(base_url.to_string());
+    }
+
+    config
+}
+
+fn configure_cloud(base_url: &str) -> Config {
+    let mut config = Config::default();
+    config.general.default_provider = "ollama_cloud".into();
+    config.general.default_model = Some("llama3:8b-cloud".into());
+    config.general.enable_streaming = false;
+    config.privacy.enable_remote_search = true;
+    config.privacy.encrypt_local_data = false;
+    config.privacy.require_consent_per_session = false;
+    config.tools.web_search.enabled = true;
+
+    if let Some(cloud) = config.providers.get_mut("ollama_cloud") {
+        cloud.enabled = true;
+        cloud.base_url = Some(base_url.to_string());
+        cloud.api_key = Some("test-key".into());
+        cloud.extra.insert(
+            "web_search_endpoint".into(),
+            Value::String("/v1/web/search".into()),
+        );
+    }
+
+    config
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn local_provider_happy_path_records_usage() {
+    let server = MockServer::start().await;
+
+    let tags = load_fixture("ollama_tags");
+    let completion = load_fixture("ollama_local_completion");
+
+    let base_url = server.uri();
+
+    let tags_template = ResponseTemplate::new(200).set_body_json(tags);
+    Mock::given(method("GET"))
+        .and(path("/api/tags"))
+        .respond_with(tags_template.clone())
+        .mount(&server)
+        .await;
+
+    Mock::given(method("POST"))
+        .and(path("/api/chat"))
+        .respond_with(ResponseTemplate::new(200).set_body_json(completion))
+        .mount(&server)
+        .await;
+
+    let config = configure_local(&base_url);
+    let provider: Arc<dyn Provider> =
+        Arc::new(OllamaProvider::new(base_url.clone()).expect("local provider"));
+
+    let (mut session, _tmp) = create_session(provider, config).await;
+
+    let outcome = session
+        .send_message(
+            "Summarise the local status.".to_string(),
+            ChatParameters::default(),
+        )
+        .await
+        .expect("local completion");
+
+    let response = match outcome {
+        SessionOutcome::Complete(response) => response,
+        _ => panic!("expected complete outcome"),
+    };
+    assert_eq!(response.message.content, "Local response complete.");
+
+    let snapshot = session
+        .current_usage_snapshot()
+        .await
+        .expect("usage snapshot");
+    assert_eq!(snapshot.provider, "ollama_local");
+    assert_eq!(snapshot.hourly.total_tokens, 36);
+    assert_eq!(snapshot.weekly.total_tokens, 36);
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn cloud_tool_call_flows_through_web_search() {
+    let server = MockServer::start().await;
+
+    let tags = load_fixture("ollama_tags");
+    let tool_call = load_fixture("ollama_cloud_tool_call");
+    let final_chunk = load_fixture("ollama_cloud_final");
+
+    let base_url = server.uri();
+
+    let tags_template = ResponseTemplate::new(200).set_body_json(tags);
+    Mock::given(method("GET"))
+        .and(path("/api/tags"))
+        .respond_with(tags_template.clone())
+        .mount(&server)
+        .await;
+
+    Mock::given(method("POST"))
+        .and(path("/api/chat"))
+        .and(BodySubstringMatcher::not_contains("\"role\":\"tool\""))
+        .respond_with(ResponseTemplate::new(200).set_body_json(tool_call))
+        .mount(&server)
+        .await;
+
+    Mock::given(method("POST"))
+        .and(path("/api/chat"))
+        .and(BodySubstringMatcher::contains("\"role\":\"tool\""))
+        .respond_with(ResponseTemplate::new(200).set_body_json(final_chunk))
+        .mount(&server)
+        .await;
+
+    Mock::given(method("POST"))
+        .and(path("/v1/web/search"))
+        .and(header("authorization", "Bearer test-key"))
+        .respond_with(ResponseTemplate::new(200).set_body_json(json!({
+            "results": [
+                {
+                    "title": "Rust 1.85 Released",
+                    "url": "https://blog.rust-lang.org/2025/10/23/Rust-1.85.html",
+                    "snippet": "Rust 1.85 lands with incremental compilation improvements."
+                }
+            ]
+        })))
+        .expect(1)
+        .mount(&server)
+        .await;
+
+    let config = configure_cloud(&base_url);
+    let cloud_cfg = config
+        .providers
+        .get("ollama_cloud")
+        .expect("cloud provider config")
+        .clone();
+    let provider: Arc<dyn Provider> = Arc::new(
+        OllamaProvider::from_config("ollama_cloud", &cloud_cfg, Some(&config.general))
+            .expect("cloud provider"),
+    );
+
+    let (mut session, _tmp) = create_session(provider, config).await;
+    session.grant_consent(
+        "web_search",
+        vec!["network".into()],
+        vec![format!("{}/v1/web/search", base_url)],
+    );
+
+    let outcome = session
+        .send_message(
+            "What is new in Rust today?".to_string(),
+            ChatParameters::default(),
+        )
+        .await
+        .expect("cloud completion");
+
+    let response = match outcome {
+        SessionOutcome::Complete(response) => response,
+        _ => panic!("expected complete outcome"),
+    };
+    assert_eq!(
+        response.message.content,
+        "Rust 1.85 shipped today. Summarising the highlights now."
+    );
+
+    let convo = session.conversation();
+    let tool_messages: Vec<_> = convo
+        .messages
+        .iter()
+        .filter(|msg| msg.role == Role::Tool)
+        .collect();
+    assert_eq!(tool_messages.len(), 1);
+    assert!(
+        tool_messages[0].content.contains("Rust 1.85 Released"),
+        "tool response should include search result"
+    );
+
+    let snapshot = session
+        .current_usage_snapshot()
+        .await
+        .expect("usage snapshot");
+    assert_eq!(snapshot.provider, "ollama_cloud");
+    assert_eq!(snapshot.hourly.total_tokens, 112); // 64 prompt + 48 completion
+    assert_eq!(snapshot.weekly.total_tokens, 112);
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn cloud_unauthorized_degrades_without_usage() {
+    let server = MockServer::start().await;
+
+    let tags = load_fixture("ollama_tags");
+    let tags_template = ResponseTemplate::new(200).set_body_json(tags);
+    let base_url = server.uri();
+    Mock::given(method("GET"))
+        .and(path("/api/tags"))
+        .respond_with(tags_template.clone())
+        .mount(&server)
+        .await;
+
+    Mock::given(method("POST"))
+        .and(path("/api/chat"))
+        .respond_with(ResponseTemplate::new(401).set_body_json(json!({
+            "error": "unauthorized"
+        })))
+        .mount(&server)
+        .await;
+
+    let config = configure_cloud(&base_url);
+    let cloud_cfg = config
+        .providers
+        .get("ollama_cloud")
+        .expect("cloud provider config")
+        .clone();
+    let provider: Arc<dyn Provider> = Arc::new(
+        OllamaProvider::from_config("ollama_cloud", &cloud_cfg, Some(&config.general))
+            .expect("cloud provider"),
+    );
+
+    let (mut session, _tmp) = create_session(provider, config).await;
+
+    let err_text = match session
+        .send_message("Switch to cloud".to_string(), ChatParameters::default())
+        .await
+    {
+        Ok(_) => panic!("expected unauthorized error, but request succeeded"),
+        Err(err) => err.to_string(),
+    };
+    assert!(
+        err_text.contains("unauthorized") || err_text.contains("API key"),
+        "error should surface unauthorized detail, got: {err_text}"
+    );
+
+    let snapshot = session
+        .current_usage_snapshot()
+        .await
+        .expect("usage snapshot");
+    assert_eq!(snapshot.hourly.total_tokens, 0);
+    assert_eq!(snapshot.weekly.total_tokens, 0);
+}
+
+#[tokio::test(flavor = "multi_thread")]
+async fn cloud_rate_limit_returns_error_without_usage() {
+    let server = MockServer::start().await;
+
+    let tags = load_fixture("ollama_tags");
+    let tags_template = ResponseTemplate::new(200).set_body_json(tags);
+    let base_url = server.uri();
+    Mock::given(method("GET"))
+        .and(path("/api/tags"))
+        .respond_with(tags_template.clone())
+        .mount(&server)
+        .await;
+
+    Mock::given(method("POST"))
+        .and(path("/api/chat"))
+        .respond_with(ResponseTemplate::new(429).set_body_json(json!({
+            "error": "too many requests"
+        })))
+        .mount(&server)
+        .await;
+
+    let config = configure_cloud(&base_url);
+    let cloud_cfg = config
+        .providers
+        .get("ollama_cloud")
+        .expect("cloud provider config")
+        .clone();
+    let provider: Arc<dyn Provider> = Arc::new(
+        OllamaProvider::from_config("ollama_cloud", &cloud_cfg, Some(&config.general))
+            .expect("cloud provider"),
+    );
+
+    let (mut session, _tmp) = create_session(provider, config).await;
+
+    let err_text = match session
+        .send_message("Hit rate limit".to_string(), ChatParameters::default())
+        .await
+    {
+        Ok(_) => panic!("expected rate-limit error, but request succeeded"),
+        Err(err) => err.to_string(),
+    };
+    assert!(
+        err_text.contains("rate limited") || err_text.contains("429"),
+        "error should mention rate limiting, got: {err_text}"
+    );
+
+    let snapshot = session
+        .current_usage_snapshot()
+        .await
+        .expect("usage snapshot");
+    assert_eq!(snapshot.hourly.total_tokens, 0);
+    assert_eq!(snapshot.weekly.total_tokens, 0);
+}