Cline – Premier Tool on OpenRouter

Introducing Cline, an intelligent agent designed to leverage your Command LIne Nvironment and Editor capabilities.

Leveraging the advanced agentic programming abilities of Claude Sonnet, Cline adeptly manages multifaceted software development workflows sequentially. Equipped with specialized tooling for file generation and modification, code base exploration, web interaction, and authorized terminal command execution, its utility surpasses mere code suggestion or technical consultancy. Furthermore, Cline supports integration with the Model Context Protocol (MCP) to construct novel tools, thereby augmenting its inherent operational scope. While typical autonomous AI scripts operate within strictly isolated execution spaces, this extension introduces a crucial human-in-the-loop graphical interface to ratify every file modification and terminal instruction, ensuring a secure and approachable method for exploring the full potential of agentic artificial intelligence.

1. Input your development directive, optionally augmenting it with visual aids like mockups or screenshots for application construction or defect resolution.
2. Cline initiates by performing deep analysis of your project structure, source code Abstract Syntax Trees (ASTs), executing sophisticated regular expression searches, and selectively reading critical files to rapidly gain project familiarity. By judiciously curating the data fed into its context window, Cline delivers meaningful assistance even for extensive, intricate codebases without causing context saturation.
3. Upon acquiring sufficient project intelligence, Cline can execute the following actions:
   • Programmatically create and modify source code files, simultaneously observing linter/compiler feedback, enabling autonomous remediation of problems like missing dependencies or syntactic errors.
   • Directly invoke commands within your terminal environment and monitor the resulting output, allowing it, for instance, to dynamically address build server failures discovered after a file modification.
   • For web-centric tasks, Cline can initiate a headless browser instance, interact with web elements (clicking, inputting text, scrolling), and capture visual states alongside console diagnostics, thereby autonomously resolving runtime anomalies and visual inconsistencies.
4. Upon task culmination, Cline presents the outcome, often summarized by a deployable terminal command (e.g., open -a "Google Chrome" index.html), which can be executed instantly via a single button press.

[!TIP] Activate the command input shortcut (CMD/CTRL + Shift + P), type "Cline: Open In New Tab", to display the extension interface as a dedicated panel alongside your file explorer. This configuration optimizes visibility into the modifications Cline makes to your development workspace.

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Access Any Endpoint or Model Backend

Cline offers extensive compatibility, supporting major API providers such as OpenRouter, Anthropic, OpenAI, Google Gemini, AWS Bedrock, Azure services, GCP Vertex AI, Cerebras, and Groq. Furthermore, you can integrate any API conforming to the OpenAI specification, or utilize local inference engines like LM Studio or Ollama. When integrated with OpenRouter, the extension automatically retrieves and presents the most current model catalog, ensuring immediate access to the newest available LLMs.

The extension meticulously tracks the cumulative token usage and associated API expenditure for the complete task lifecycle and for each discrete interaction, maintaining transparency regarding resource consumption throughout the process.

Execute Operations Within the Terminal

Leveraging the enhancements introduced in VSCode's shell integration updates (v1.93), Cline possesses the capability to dispatch commands directly into your active terminal session and capture the resulting output. This enables a vast spectrum of operations, from dependency installation and build script execution to application deployment, database management, and test suite runs—all while adapting dynamically to the specifics of your development ecosystem and toolchain to ensure correct execution.

For extended operations like running persistent development servers, employ the "Proceed While Running" control to permit Cline to advance its task logic concurrently while the command persists in the background. Cline receives real-time notifications of any subsequent terminal output, allowing it to dynamically respond to emerging issues, such as compilation errors triggered by recent code edits.

Modify and Construct Files

Cline facilitates direct manipulation of files within your editor interface, presenting proposed modifications via a standard diff view. Users retain the prerogative to edit or discard Cline's suggested changes directly within the diff pane or to refine the output through iterative chat dialogue until satisfaction is achieved. Moreover, Cline actively monitors static analysis feedback (linter warnings, compilation failures, etc.) to autonomously address nascent issues as they arise.

All alterations instigated by Cline are persistently logged within the file's native Timeline feature, ensuring an easily auditable trail for tracking and reversal of modifications.

Interface with Web Browsers

Capitalizing on Claude Sonnet's novel Computer Use capability, Cline can initiate browser sessions, interact with DOM elements (via clicking, text input, scrolling), and capture sequential screenshots alongside console data. This unlocks potent capabilities for dynamic debugging, comprehensive end-to-end validation, and general web interaction! It grants the agent the autonomy to fix visual regressions and runtime errors without requiring manual intervention or constant error log transcription from the user.

Experiment by instructing Cline to "test the application"; observe it execute a command like npm run dev, launch your local server environment in a browser window, and subsequently execute a series of verification steps to confirm functional correctness. A demonstration video is available here.

Command: "introduce a new capability that..."

Thanks to the framework established by the Model Context Protocol, Cline's operational capacity can be readily augmented via user-defined utilities. While access to external, community-developed servers is possible, Cline is uniquely equipped to create and deploy bespoke tools tailored precisely to your specific operational requirements. Simply instruct Cline to "add a tool," and it will manage the entire process, from provisioning a new MCP service endpoint to integrating it directly into the extension's toolkit. These newly created tools then become permanent additions to Cline's repertoire for subsequent task execution.

• "add a tool that retrieves Jira ticket status": Fetch required action items and delegate subsequent work to Cline.
• "add a tool that interfaces with AWS EC2 management": Query current server telemetry and execute instance scaling adjustments.
• "add a tool that queries the latest PagerDuty alerts": Retrieve incident specifics and task Cline with implementing necessary bug fixes.

Contextual Input Mechanisms

@url: Input a web address; the extension fetches the content and converts it into markdown format, beneficial for providing Cline with the most current documentation.

@problems: Incorporate active diagnostic reports (errors/warnings) from the IDE's 'Problems' panel to guide Cline toward immediate fixes.

@file: Inject the complete content of a specific file directly, bypassing the need for API usage on simple file reads (can be augmented by typing to search files).

@folder: Provide contents of an entire directory recursively to significantly accelerate context loading for large components.

Snapshotting: Comparison and State Reversion

As Cline progresses through a defined development objective, the extension systematically archives the workspace state at critical junctures. Users can activate the 'Compare' function to visualize differences between an archived snapshot and the current live state, or utilize the 'Restore' function to revert the environment to that specific historical point.

For scenarios involving locally hosted web applications, the 'Restore Workspace Only' option allows for rapid iteration across diverse application versions. Conversely, 'Restore Task and Workspace' is utilized when a particular intermediate state is confirmed as the optimal foundation for continued development. This dual-mode rollback capability enables safe experimentation with divergent solution paths without jeopardizing accumulated work.

Collaboration Guidelines

Prospective contributors should first consult our Contributing Guide to grasp the foundational principles of the project. For real-time discussions with fellow developers, engage in the #contributors channel on our Discord server. Individuals seeking full-time engagement are invited to explore available roles on our recruitment portal!

Licensing

Apache 2.0 © 2025 Cline Bot Inc.

WIKIPEDIA: XMLHttpRequest (XHR) is a browser-native JavaScript API composed of object methods that facilitate the transmission of Hypertext Transfer Protocol (HTTP) requests from a client web browser to a designated web server. These methods empower client-side applications to initiate server communications subsequent to page loading, and subsequently process the received data. XMLHttpRequest serves as a core underpinning technology for Asynchronous JavaScript and XML (Ajax) programming paradigms. Before the widespread adoption of Ajax, the primary means of server interaction involved standard hyperlink navigation and HTML form submissions, actions which typically necessitated a full page reload.

== Chronology == The foundational concept for XMLHttpRequest was first conceptualized in the year 2000 by the engineering team responsible for Microsoft Outlook. This idea was subsequently implemented within the Internet Explorer 5 browser release (1999). However, the initial implementation did not utilize the standardized 'XMLHttpRequest' identifier. Instead, developers relied on instantiating objects via ActiveXObject("Msxml2.XMLHTTP") or ActiveXObject("Microsoft.XMLHTTP"). As of Internet Explorer 7 (2006), universal support across all major browsers for the canonical 'XMLHttpRequest' identifier was achieved. The 'XMLHttpRequest' identifier is now universally recognized as the established convention across all primary browser engines, including Mozilla's Gecko rendering engine (adopted in 2002), Apple's Safari 1.2 (2004), and Opera 8.0 (2005).

=== Standardization Efforts === The World Wide Web Consortium (W3C) published the initial Working Draft specification for the XMLHttpRequest object on April 5, 2006. On February 25, 2008, the W3C released the Level 2 Working Draft specification. Level 2 introduced significant enhancements, notably methods for monitoring data transfer progress, enabling cross-origin resource sharing (CORS) requests, and facilitating the handling of raw byte streams. By the conclusion of 2011, the Level 2 specification was formally integrated back into the core specification document. At the close of 2012, the WHATWG assumed stewardship over the specification, where it is now maintained as a continuously updated living document utilizing the Web IDL interface description language.

== Operational Usage == Generally, issuing a network request using XMLHttpRequest necessitates adherence to a sequence of distinct programming steps.

Instantiate an XMLHttpRequest object via its constructor call: Invoke the "open" method to define the request method (GET, POST, etc.), specify the target Uniform Resource Identifier (URI), and select between synchronous or asynchronous execution mode: For operations configured for asynchronous behavior, establish an event handler function designed to respond when the request's operational state transitions: Commence the transaction by executing the "send" method, optionally passing payload data: Process state changes within the registered event listener. If the server returns data, it is typically aggregated within the "responseText" property by default. When the object finalizes processing the response, its state transitions to 4, signifying the "done" status. Beyond these fundamental steps, XMLHttpRequest offers extensive configuration parameters to govern request transmission and response parsing. Custom HTTP headers can be appended to the outgoing request to instruct the server on desired fulfillment semantics, and data can be transmitted to the server via arguments passed to the "send" invocation. The received payload can be automatically deserialized from JSON format into native JavaScript objects or processed incrementally as data segments arrive, eliminating the wait for the complete text block. Moreover, the operation can be terminated prematurely or configured with a maximum timeout period before failure.

== Inter-Domain Communication ==

During the early phases of the World Wide Web's evolution, it became apparent that the security model permitted the brea