docs: mention Exa and Parallel as web search backends (anomalyco#38395)

Author: dondetir

packages/web/src/content/docs/cli.mdx

@@ -701,6 +701,7 @@ OpenCode can be configured using environment variables.
 | `OPENCODE_FAKE_VCS`                   | string  | Fake VCS provider for testing purposes            |
 | `OPENCODE_CLIENT`                     | string  | Client identifier (defaults to `cli`)             |
 | `OPENCODE_ENABLE_EXA`                 | boolean | Enable Exa web search tools                       |
+| `OPENCODE_ENABLE_PARALLEL`            | boolean | Enable Parallel web search tools                  |
 | `OPENCODE_SERVER_PASSWORD`            | string  | Enable basic auth for `serve`/`web`               |
 | `OPENCODE_SERVER_USERNAME`            | string  | Override basic auth username (default `opencode`) |
 | `OPENCODE_MODELS_URL`                 | string  | Custom URL for fetching models configuration      |

packages/web/src/content/docs/tools.mdx

@@ -257,12 +257,14 @@ Allows the LLM to fetch and read web pages. Useful for looking up documentation
 Search the web for information.
 
 :::note
-This tool is only available when using the OpenCode or OpenCode Go provider, or when the `OPENCODE_ENABLE_EXA` environment variable is set to any truthy value (e.g., `true` or `1`).
+This tool is only available when using the OpenCode or OpenCode Go provider, or when either the `OPENCODE_ENABLE_EXA` or `OPENCODE_ENABLE_PARALLEL` environment variable is set to any truthy value (e.g., `true` or `1`).
 
 To enable when launching OpenCode:
 
 ```bash
 OPENCODE_ENABLE_EXA=1 opencode
+# or
+OPENCODE_ENABLE_PARALLEL=1 opencode
 ```
 
 :::
@@ -276,9 +278,9 @@ OPENCODE_ENABLE_EXA=1 opencode
 }
 ```
 
-Performs web searches using Exa AI to find relevant information online. Useful for researching topics, finding current events, or gathering information beyond the training data cutoff.
+Performs web searches using Exa or Parallel to find relevant information online. Useful for researching topics, finding current events, or gathering information beyond the training data cutoff.
 
-No API key is required — the tool connects directly to Exa AI's hosted MCP service without authentication.
+No API key is required — the tool connects directly to the backend's hosted MCP service without authentication.
 
 :::tip
 Use `websearch` when you need to find information (discovery), and `webfetch` when you need to retrieve content from a specific URL (retrieval).