feat: adds context-llm tool support (#616)

* feat: adds context-llm tool support

Introduces a new tool for the LLM Context endpoint of the Brave Search API: https://api-dashboard.search.brave.com/documentation/services/llm-context.

* minor refactoring

* Update registry/tools/llm-context.json

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Update tools-src/llm-context/llm-context-tool.capabilities.json

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Update tools-src/llm-context/src/lib.rs

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* chore: address feedback from review

* address feedback

* address feedback

* fix: remove snippet-counting fn

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

tools-src/llm-context/Cargo.toml

@@ -0,0 +1,23 @@
+[package]
+name = "llm-context-tool"
+version = "0.1.0"
+edition = "2021"
+description = "Brave Search LLM Context tool for IronClaw (WASM component)"
+license = "MIT OR Apache-2.0"
+publish = false
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+wit-bindgen = "0.41.0"
+
+[lib]
+crate-type = ["cdylib"]
+
+[profile.release]
+opt-level = "s"
+lto = true
+strip = true
+codegen-units = 1
+
+[workspace]

tools-src/llm-context/llm-context-tool.capabilities.json

@@ -0,0 +1,53 @@
+{
+  "version": "0.1.0",
+  "wit_version": "0.3.0",
+  "capabilities": {
+    "http": {
+      "allowlist": [
+        {
+          "host": "api.search.brave.com",
+          "path_prefix": "/res/v1/llm/context",
+          "methods": [
+            "POST"
+          ]
+        }
+      ],
+      "credentials": {
+        "brave_api_key": {
+          "secret_name": "brave_api_key",
+          "location": {
+            "type": "header",
+            "name": "X-Subscription-Token"
+          },
+          "host_patterns": [
+            "api.search.brave.com"
+          ]
+        }
+      },
+      "rate_limit": {
+        "requests_per_minute": 30,
+        "requests_per_hour": 500
+      }
+    },
+    "secrets": {
+      "allowed_names": [
+        "brave_api_key"
+      ]
+    }
+  },
+  "auth": {
+    "secret_name": "brave_api_key",
+    "display_name": "Brave Search",
+    "instructions": "Get a free API key at brave.com/search/api/ (Free tier: 2,000 queries/month). Same key as Web Search.",
+    "setup_url": "https://brave.com/search/api/",
+    "env_var": "BRAVE_API_KEY"
+  },
+  "setup": {
+    "required_secrets": [
+      {
+        "name": "brave_api_key",
+        "prompt": "Brave Search API key (from brave.com/search/api)"
+      }
+    ]
+  }
+}