Rancher is a beast of a codebase. Let's investigate if the new 2025 generation of GitHub Autonomous Coding Agents and Copilot Workspaces can actually tame it. A GitHub robot mascot trying to lasso a blue bull with a Kubernetes logo tatooed on it


The Plan

Create a sandbox GitHub Organization, clone in key Rancher repositories, and let the AI loose to see if it can handle real-world enterprise OSS maintenance - or if it just hallucinates new breeds of Kubernetes resources!

Specifically, throw "Agentic Coders" some typical tasks in a complex, long-lived open-source project, such as:


The Grunt Work: generate missing GoDocs, unit tests, and refactorings. Rebase PRs.

The Complex Stuff: fix actual (historical) bugs and feature requests to see if they can traverse the complexity without (too much) human hand-holding.

Hunting Down Gaps: find areas lacking in docs, areas of improvement in code, dependency bumps, and so on.


If time allows, also experiment with Model Context Protocol (MCP) to give agents context on our specific build pipelines and CI/CD logs.

Why?

We know AI can write "Hello World." and also moderately complex programs from a green field. But can it rebase a 3-month-old PR with conflicts in rancher/rancher? I want to find the breaking point of current AI agents to determine if and how they can help us to reduce our technical debt, work faster and better. At the same time, find out about pitfalls and shortcomings.

The CONCLUSION!!!

A add-emoji State of the Union add-emoji document was compiled to summarize lessons learned this week. For more gory details, just read on the diary below! add-emoji

Looking for hackers with the skills:

kubernetes rancher ai agenticai github

This project is part of:

Hack Week 25

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  • Comments

    • moio
      16 days ago by moio | Reply

      Day 1

      Successes

      I had Copilot agents:

      Failures (and Tips to Avoid Them)

      I had Copilot agents:

      • Torching API Limits: A naive approach to surveying ~3,000 open issues hit the wall immediately. screenshot

        • Mitigation: think about API mis(use) *before* hitting enter. Agents like to take shortest paths to solutions.
      • Getting into infinite loops as they repeatedly lose context. Agents love to chase their own tails as context windows overflow, wasting time and resources!
        screenshot dog chasing tail

        • Mitigation: limit the amount of context the agent needs to keep in working memory to accomplish the task. That is not always possible though.
      • Finding duplicate issues in Rancher https://github.com/moio/rancher/pull/2. The approach just did not scale. I am working at another approach

      • Refusing to work across repos. Agents are strictly bound to a single repository. They can access other repos (including issues, PRs, etc) read-only for context, but they cannot, say, open PRs other than the one they were started in.

        • Avoid by: framing multiple requests to multiple repos and coordinating the results. Or use less distinct repos where possible (this is a big problem in Rancher, as we use so many).
      • Burn out 13% of my monthly requests on Day 1! Speed running the budget! add-emoji
        screenshot

      The Jury is Still Out On

      Good/Bad/Ugly

      • add-emoji Async Warfare: Massive parallelism. Fire off multiple tasks and check back later.
      • add-emoji PR interaction: agents dutifully follow up to every single line-by-line comment! The PR review user interaction really works well compared to CLI workflows
      • add-emoji Latency: Simple tasks can take a *painfully* long time
      • add-emoji Context size limitations: agents do not typically have the full repo in context - even for a small one. You have to point them to files/directories/greppable strings to direct any efforts efficiently.

      Pitfalls & Sharp Edges

      • Pitfall: not knowing where to start - but it’s easy if you know where to click. Tricky icon is “New agent task” close to the clone button:

      screenshot

      • Pitfall: creating custom org for Copilot was a no-go. Requires payment of enterprise subscription, would need to copy over issues and PRs, no evident advantage for now
      • Pitfall: trying to understand why agents are not enabled on all repos. Agents require write permission on the repo being changed.
        • Workaround: run agents on your fork instead
      • Facepalm Moment of the Day:
        • Agent: Thanks for asking me to work on this.
        • Me: Dial back the obsequiousness, Microsoft! These are programming tools, not training butlers!

      The VERDICT for Today

      Agentic AI offers High-bandwidth, high-latency coding

      • Upside: working on multiple fronts in parallel works very well
      • The Catch: It’s slow. Slower than AI CLI tools. Sometimes slower than you.
        • Just like CI or the Open Build Service, working with them “interactively” (that is, waiting on them to conclude) will kill your velocity.

      You have been warned.

    • moio
      14 days ago by moio | Reply

      Day 2

      Successes

      Failures (and The Sharp Edges)

      • Merge Conflicts: When multiple agents touch the same file, concurrent changes require manual reconciliation. Agents cannot force push or rebase, and they messed up merging.
        • Sharp Edge: Avoid concurrent agent work on the same file/section. (Difficult to enforce in large projects like Rancher)
      • Whole-Rancher issue cleanup: Total hallucination. The agent invented links to unrelated reports and invented responses. https://github.com/moio/rancher/pull/2

      a screen capture showing hallucinations

      • Sharp Edge: do not even try feeding an agent with so much data. In this case a full issue dump (~600 MiB) crushed the ~2 MiB limit.
      • Core Library Bugfix: Failed. The agent assumed the wrong base branch. Worse, it misinterpreted the report and confidently suggested a broken solution. https://github.com/moio/steve/pull/1
        • Mitigation 1: Verify your default branch/fork. Agents accept the default as absolute truth!
        • Mitigation 2: Sharpen your prompts. Since the full codebase won't fit in context, agents need "greppable" keywords (function names, error strings) to locate the relevant code. A bug report written for humans may be too vague for an agent. Compare:
        • https://github.com/rancher/rancher/issues/52872 (made for humans)
        • “When BeginTx is called, there is a chance SQLITE_BUSY or SQLITE_BUSY_SNAPSHOT are returned - without the busy handler being engaged. We want to retry in that case.” (points agent to portion of code to patch, making the starting point “greppable”)

      The Jury is Still Out On

      The VERDICT for Today

      Know your tool. Understanding agent internals makes the difference between velocity and hallucinated infinite loops.

      1. Their context window (working memory) is limited - e.g., for GPT-5.1 that’s 400k tokens or about 1.6M characters.
      2. Exceeding this limit guarantees severe hallucinations.
      3. Agents do (and you should too) try to work around that limit with plain text search before the LLM phase

      Best Weapon: Manually limit context. Feed the agent error strings, function names, and file paths so it can scope down immediately.

      Larger problems may just be intractable at this point.

      Additionally, a critical limitation is that agents cannot solve merge conflicts. That limits their viability in large projects, as it reduces the parallelism.

    • moio
      14 days ago by moio | Reply

      Day 3

      Successes

      Failures (and Tips to Avoid Them)

      • Fixing a Bug Requiring Multi-Repo Coordination: The agent struggled to bridge the UI and Backend repositories simultaneously, even when hand-held (https://github.com/moio/dashboard/pull/2 https://github.com/moio/steve/pull/3). The proposed API interface was unconvincing, and the implementation failed to run. Silver Lining: It acted as a decent "grep." It identified the correct code paths, even if it couldn't fix them.
      • Sharp Edge: The Firewall. Agents live in a sandbox. They cannot access the open web (e.g., k8s.io or scc.suse.com) - whitelist domains they access in Settings -- Copilot -- Copilot agents or you will get the error message below.
        • Mitigation: Design for "Offline Mode." Ensure lint/test/validation steps don't require external fetch. If the agent can't reach it, it can't run it.

      screenshot of firewall issue

      The Jury is Still Out On

      The VERDICT for Today

      Multi-repository work is an issue for GitHub agents. I wonder how well Claude does, and I am planning to look into it next.

    • moio
      13 days ago by moio | Reply

      Day 4

      Claude Code vs. GitHub Copilot

      Unplanned Detour: Subscribed to Claude Pro to test the hype against GitHub Copilot.

      Impressions

      • The Good:
        • CLI UI/UX is significantly smoother
        • Text reports are readable and clear
        • Seemed less prone to the "death spirals" (loops) I saw with Gemini
      • The Bad:
        • Integration Friction: GitHub integration feels second-class. Example: I asked it to remove lines in a review; it proceeded to remove only the blank lines. Malicious compliance?.
        • Blindspots: No nice UI for logging activities, just raw GHA verbose logs. Quota errors are cryptic.
      • The Ugly:
        • Burn Rate: The "5-hour limit" is (almost) a joke; I burned it in under 2 hours.
        • ROI: Significantly lower mileage compared to Gemini or Copilot plans at similar prices.

      Successes

      • i18n on a Budget: almost successful at internationalizing a small hobby app (~100 strings).
        • Catch: It worked, but consumed an excruciating amount of tokens and required manual "pointing" to missed spots.

      Failures (and The Sharp Edges)

      • The Plagiarist: While attempting a UI fix, the Copilot agent scraped code from an unmerged PR and presented it as a solution.
        • Risk: It will happily reuse work in progress without credit!
      • Sharp Edge: Admin Walls. Whitelisting domains (Firewall) in Copilot requires repo Admin rights.
        • If you work on a shared repo without admin access, you cannot add the necessary exceptions. This adds a significant maintenance burden.
      • Mass-reviewing all Rancher design docs: Copilot was technically correct, but practically useless.
        • It successfully flagged inconsistencies... between "Archival" and "Live" docs. It found entropy, not value.

      The Jury is Still Out On

      • Copilot PR Reviews: Waiting on infrastructure team enablement.

      The VERDICT for Today

      No Silver Bullet. Claude has a slicker UI and avoids some logic loops, but the "smartness" delta does not seem to justify the abysmal burn rate. At least today. Looking forward to play more tomorrow.

    • moio
      8 days ago by moio | Reply

      Day 5

      Continued testing of Claude Code vs. GitHub Copilot vs. Gemini CLI

      Impressions

      • The Good Claude
        • Meta-programming: While refactoring code to change to a different coordinate system in a hobby project, the agent had to translate some hardcoded patterns. Instead of brute-forcing the change, Claude wrote a Python script to perform the coordinate transformation, applied it to the patterns, and injected the results in the pull request. Neat!
        • Insight: It didn't just write code; it built a tool to write the code.
        • Follow-up: it did something similar for audio later. I needed sound effects; Claude wrote a script to synthesize them rather than hallucinating binary data.
        • Instruction Adherence: I found Claude to be significantly better at following complex instructions and its own self-generated "TODO" lists than Gemini CLI + Code Assist.
        • Ask without the Rush: it generally produced clearer explanations than GitHub Copilot and asked clarifying questions before rushing into implementation (unlike the "shoot first, ask later" approach of Gemini CLI).
        • Rebasing: Claude was surprisingly competent at handling git rebases, which did not work well in Copilot
        • PR reviews: Claude did excellent PR reviews, both in terms of content and reading clarity
      • The Ugly Claude
        • The "Pro" Misnomer: Claude Pro should really be renamed Claude Demo.
        • Sharp Edge: The usage limits are comically low for serious development. You hit the wall just as you get into the "flow"

      Being quite unsure about the verdict, I have also had the three agents (Copilot with GPT-5.1, Gemini CLI with Code Assist Pro and Claude with Sonnet 4.5) the same mid-sized task and observed the results.

      The VERDICT for Today

      Smart but Lazy. Claude comes up with better plans, writes clearer text and uses tools more intelligently than its competitors. However, the aggressive rate limits mean this "Senior Engineer" only works 2 hours a day before clocking out.

      Better, but not radically so: Claude Code has the best UX of the three, and the model does have an edge as described, but I did not find the difference to be huge. Paying for a Claude Pro subscription when one already has Copilot or Gemini isn’t justified, the jury is still out on Claude Ultra, where potentially much more could be delegated to GitHub Actions.

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    asciicast

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    • Deliver an easy-to-install, read-only component (single YAML or small Helm chart) that Rancher users can deploy to their management cluster and inspect via kubectl get/describe, without UI changes or direct access to downstream clusters.
    • Use idiomatic Go, wrangler, and Rancher APIs.

    Resources

    • Rancher Manager documentation on RKE2 and K3s cluster configuration and provisioning flows.
    • Rancher API Go types for provisioning.cattle.io/v1 and management.cattle.io/v3 (from the rancher/rancher repository or published Go packages).
    • Existing Rancher architecture docs and internal notes about cluster provisioning, cluster agents, and node agents.
    • A local Rancher management cluster (k3s or RKE2) with a few test downstream clusters to validate phase detection, history tracking, and recommendations.


    Backporting patches using LLM by jankara

    Description

    Backporting Linux kernel fixes (either for CVE issues or as part of general git-fixes workflow) is boring and mostly mechanical work (dealing with changes in context, renamed variables, new helper functions etc.). The idea of this project is to explore usage of LLM for backporting Linux kernel commits to SUSE kernels using LLM.

    Goals

    • Create safe environment allowing LLM to run and backport patches without exposing the whole filesystem to it (for privacy and security reasons).
    • Write prompt that will guide LLM through the backporting process. Fine tune it based on experimental results.
    • Explore success rate of LLMs when backporting various patches.

    Resources

    • Docker
    • Gemini CLI

    Repository

    Current version of the container with some instructions for use are at: https://gitlab.suse.de/jankara/gemini-cli-backporter


    AI-Powered Unit Test Automation for Agama by joseivanlopez

    The Agama project is a multi-language Linux installer that leverages the distinct strengths of several key technologies:

    • Rust: Used for the back-end services and the core HTTP API, providing performance and safety.
    • TypeScript (React/PatternFly): Powers the modern web user interface (UI), ensuring a consistent and responsive user experience.
    • Ruby: Integrates existing, robust YaST libraries (e.g., yast-storage-ng) to reuse established functionality.

    The Problem: Testing Overhead

    Developing and maintaining code across these three languages requires a significant, tedious effort in writing, reviewing, and updating unit tests for each component. This high cost of testing is a drain on developer resources and can slow down the project's evolution.

    The Solution: AI-Driven Automation

    This project aims to eliminate the manual overhead of unit testing by exploring and integrating AI-driven code generation tools. We will investigate how AI can:

    1. Automatically generate new unit tests as code is developed.
    2. Intelligently correct and update existing unit tests when the application code changes.

    By automating this crucial but monotonous task, we can free developers to focus on feature implementation and significantly improve the speed and maintainability of the Agama codebase.

    Goals

    • Proof of Concept: Successfully integrate and demonstrate an authorized AI tool (e.g., gemini-cli) to automatically generate unit tests.
    • Workflow Integration: Define and document a new unit test automation workflow that seamlessly integrates the selected AI tool into the existing Agama development pipeline.
    • Knowledge Sharing: Establish a set of best practices for using AI in code generation, sharing the learned expertise with the broader team.

    Contribution & Resources

    We are seeking contributors interested in AI-powered development and improving developer efficiency. Whether you have previous experience with code generation tools or are eager to learn, your participation is highly valuable.

    If you want to dive deep into AI for software quality, please reach out and join the effort!

    • Authorized AI Tools: Tools supported by SUSE (e.g., gemini-cli)
    • Focus Areas: Rust, TypeScript, and Ruby components within the Agama project.

    Interesting Links


    "what is it" file and directory analysis via MCP and local LLM, for console and KDE by rsimai

    Description

    Users sometimes wonder what files or directories they find on their local PC are good for. If they can't determine from the filename or metadata, there should an easy way to quickly analyze the content and at least guess the meaning. An LLM could help with that, through the use of a filesystem MCP and to-text-converters for typical file types. Ideally this is integrated into the desktop environment but works as well from a console. All data is processed locally or "on premise", no artifacts remain or leave the system.

    Goals

    • The user can run a command from the console, to check on a file or directory
    • The filemanager contains the "analyze" feature within the context menu
    • The local LLM could serve for other use cases where privacy matters

    TBD

    • Find or write capable one-shot and interactive MCP client
    • Find or write simple+secure file access MCP server
    • Create local LLM service with appropriate footprint, containerized
    • Shell command with options
    • KDE integration (Dolphin)
    • Package
    • Document

    Resources


    issuefs: FUSE filesystem representing issues (e.g. JIRA) for the use with AI agents code-assistants by llansky3

    Description

    Creating a FUSE filesystem (issuefs) that mounts issues from various ticketing systems (Github, Jira, Bugzilla, Redmine) as files to your local file system.

    And why this is good idea?

    • User can use favorite command line tools to view and search the tickets from various sources
    • User can use AI agents capabilities from your favorite IDE or cli to ask question about the issues, project or functionality while providing relevant tickets as context without extra work.
    • User can use it during development of the new features when you let the AI agent to jump start the solution. The issuefs will give the AI agent the context (AI agents just read few more files) about the bug or requested features. No need for copying and pasting issues to user prompt or by using extra MCP tools to access the issues. These you can still do but this approach is on purpose different.

    Goals

    1. Add Github issue support
    2. Proof the concept/approach by apply the approach on itself using Github issues for tracking and development of new features
    3. Add support for Bugzilla and Redmine using this approach in the process of doing it. Record a video of it.
    4. Clean-up and test the implementation and create some documentation
    5. Create a blog post about this approach

    Resources

    There is a prototype implementation here. This currently sort of works with JIRA only.


    Try out Neovim Plugins supporting AI Providers by enavarro_suse

    Description

    Experiment with several Neovim plugins that integrate AI model providers such as Gemini and Ollama.

    Goals

    Evaluate how these plugins enhance the development workflow, how they differ in capabilities, and how smoothly they integrate into Neovim for day-to-day coding tasks.

    Resources


    SUSE Observability MCP server by drutigliano

    Description

    The idea is to implement the SUSE Observability Model Context Protocol (MCP) Server as a specialized, middle-tier API designed to translate the complex, high-cardinality observability data from StackState (topology, metrics, and events) into highly structured, contextually rich, and LLM-ready snippets.

    This MCP Server abstract the StackState APIs. Its primary function is to serve as a Tool/Function Calling target for AI agents. When an AI receives an alert or a user query (e.g., "What caused the outage?"), the AI calls an MCP Server endpoint. The server then fetches the relevant operational facts, summarizes them, normalizes technical identifiers (like URNs and raw metric names) into natural language concepts, and returns a concise JSON or YAML payload. This payload is then injected directly into the LLM's prompt, ensuring the final diagnosis or action is grounded in real-time, accurate SUSE Observability data, effectively minimizing hallucinations.

    Goals

    • Grounding AI Responses: Ensure that all AI diagnoses, root cause analyses, and action recommendations are strictly based on verifiable, real-time data retrieved from the SUSE Observability StackState platform.
    • Simplifying Data Access: Abstract the complexity of StackState's native APIs (e.g., Time Travel, 4T Data Model) into simple, semantic functions that can be easily invoked by LLM tool-calling mechanisms.
    • Data Normalization: Convert complex, technical identifiers (like component URNs, raw metric names, and proprietary health states) into standardized, natural language terms that an LLM can easily reason over.
    • Enabling Automated Remediation: Define clear, action-oriented MCP endpoints (e.g., execute_runbook) that allow the AI agent to initiate automated operational workflows (e.g., restarts, scaling) after a diagnosis, closing the loop on observability.

     Hackweek STEP

    • Create a functional MCP endpoint exposing one (or more) tool(s) to answer queries like "What is the health of service X?") by fetching, normalizing, and returning live StackState data in an LLM-ready format.

     Scope

    • Implement read-only MCP server that can:
      • Connect to a live SUSE Observability instance and authenticate (with API token)
      • Use tools to fetch data for a specific component URN (e.g., current health state, metrics, possibly topology neighbors, ...).
      • Normalize response fields (e.g., URN to "Service Name," health state DEVIATING to "Unhealthy", raw metrics).
      • Return the data as a structured JSON payload compliant with the MCP specification.

    Deliverables

    • MCP Server v0.1 A running Golang MCP server with at least one tool.
    • A README.md and a test script (e.g., curl commands or a simple notebook) showing how an AI agent would call the endpoint and the resulting JSON payload.

    Outcome A functional and testable API endpoint that proves the core concept: translating complex StackState data into a simple, LLM-ready format. This provides the foundation for developing AI-driven diagnostics and automated remediation.

    Resources

    • https://www.honeycomb.io/blog/its-the-end-of-observability-as-we-know-it-and-i-feel-fine
    • https://www.datadoghq.com/blog/datadog-remote-mcp-server
    • https://modelcontextprotocol.io/specification/2025-06-18/index
    • https://modelcontextprotocol.io/docs/develop/build-server

     Basic implementation

    • https://github.com/drutigliano19/suse-observability-mcp-server

    Results

    Successfully developed and delivered a fully functional SUSE Observability MCP Server that bridges language models with SUSE Observability's operational data. This project demonstrates how AI agents can perform intelligent troubleshooting and root cause analysis using structured access to real-time infrastructure data.

    Example execution


    Enable more features in mcp-server-uyuni by j_renner

    Description

    I would like to contribute to mcp-server-uyuni, the MCP server for Uyuni / Multi-Linux Manager) exposing additional features as tools. There is lots of relevant features to be found throughout the API, for example:

    • System operations and infos
    • System groups
    • Maintenance windows
    • Ansible
    • Reporting
    • ...

    At the end of the week I managed to enable basic system group operations:

    • List all system groups visible to the user
    • Create new system groups
    • List systems assigned to a group
    • Add and remove systems from groups

    Goals

    • Set up test environment locally with the MCP server and client + a recent MLM server [DONE]
    • Identify features and use cases offering a benefit with limited effort required for enablement [DONE]
    • Create a PR to the repo [DONE]

    Resources


    issuefs: FUSE filesystem representing issues (e.g. JIRA) for the use with AI agents code-assistants by llansky3

    Description

    Creating a FUSE filesystem (issuefs) that mounts issues from various ticketing systems (Github, Jira, Bugzilla, Redmine) as files to your local file system.

    And why this is good idea?

    • User can use favorite command line tools to view and search the tickets from various sources
    • User can use AI agents capabilities from your favorite IDE or cli to ask question about the issues, project or functionality while providing relevant tickets as context without extra work.
    • User can use it during development of the new features when you let the AI agent to jump start the solution. The issuefs will give the AI agent the context (AI agents just read few more files) about the bug or requested features. No need for copying and pasting issues to user prompt or by using extra MCP tools to access the issues. These you can still do but this approach is on purpose different.

    Goals

    1. Add Github issue support
    2. Proof the concept/approach by apply the approach on itself using Github issues for tracking and development of new features
    3. Add support for Bugzilla and Redmine using this approach in the process of doing it. Record a video of it.
    4. Clean-up and test the implementation and create some documentation
    5. Create a blog post about this approach

    Resources

    There is a prototype implementation here. This currently sort of works with JIRA only.


    Is SUSE Trending? Popularity and Developer Sentiment Insight Using Native AI Capabilities by terezacerna

    Description

    This project aims to explore the popularity and developer sentiment around SUSE and its technologies compared to Red Hat and their technologies. Using publicly available data sources, I will analyze search trends, developer preferences, repository activity, and media presence. The final outcome will be an interactive Power BI dashboard that provides insights into how SUSE is perceived and discussed across the web and among developers.

    Goals

    1. Assess the popularity of SUSE products and brand compared to Red Hat using Google Trends.
    2. Analyze developer satisfaction and usage trends from the Stack Overflow Developer Survey.
    3. Use the GitHub API to compare SUSE and Red Hat repositories in terms of stars, forks, contributors, and issue activity.
    4. Perform sentiment analysis on GitHub issue comments to measure community tone and engagement using built-in Copilot capabilities.
    5. Perform sentiment analysis on Reddit comments related to SUSE technologies using built-in Copilot capabilities.
    6. Use Gnews.io to track and compare the volume of news articles mentioning SUSE and Red Hat technologies.
    7. Test the integration of Copilot (AI) within Power BI for enhanced data analysis and visualization.
    8. Deliver a comprehensive Power BI report summarizing findings and insights.
    9. Test the full potential of Power BI, including its AI features and native language Q&A.

    Resources

    1. Google Trends: Web scraping for search popularity data
    2. Stack Overflow Developer Survey: For technology popularity and satisfaction comparison
    3. GitHub API: For repository data (stars, forks, contributors, issues, comments).
    4. Gnews.io API: For article volume and mentions analysis.
    5. Reddit: SUSE related topics with comments.