docs: add tutorial guide for the Bug Fix workflow

docs/bugfix-tutorial.md

@@ -0,0 +1,393 @@
+# Bug Fix Workflow Tutorial
+
+This tutorial walks you through using the Bug Fix workflow on the Ambient
+Code Platform to diagnose and fix software bugs. By the end you will know how
+to start a session, move through each phase of the workflow, and submit a pull
+request with the fix.
+
+## Getting Started
+
+### Log in and create a session
+
+Open [red.ht/ambient](https://red.ht/ambient) and start a new session. Select
+the **Bug Fix** workflow and the model you want to use.
+
+### Choosing a model
+
+At the time of writing, **Claude Opus** is the model we find works best for
+fixing bugs. If your bug is straightforward (a clear error message pointing to
+an obvious cause), a less powerful model may be fine and can be quicker and
+cheaper.
+
+Keep in mind, though, that if the bug turns out to be more complex than you
+expect, a less powerful model can end up being *slower* and *more expensive*. A
+bug that a stronger model solves in one pass may take several rounds of
+back-and-forth with a weaker model, consuming more time and tokens overall. When
+in doubt, start with a capable model.
+
+### Adding repository context
+
+You can add the GitHub repository you want to work on by clicking the
+**Add Context** tab in the Explorer panel before you begin. However, this is
+not strictly necessary. If you give the workflow a link to the repository, or
+to an issue in that repository, it will clone the repo into your session
+automatically. Adding it in the Explorer panel can still be helpful for
+simplifying the model's task by ensuring it has the repo you want available
+before starting.
+
+## Starting the Workflow
+
+There are several ways to kick things off once your session is running.
+
+### Option 1: Paste a bug issue link
+
+Simply paste a link to a GitHub issue and the workflow will clone the repository
+and begin walking you through the bug fix process interactively. For example:
+
+```text
+https://github.com/llamastack/llama-stack/issues/5119
+```
+
+The workflow will assess the issue, summarize its understanding, and ask for
+your input before moving on to the next step.  Alternatively, you could start with:
+
+```text
+/assess https://github.com/llamastack/llama-stack/issues/5119
+```
+
+That makes it more explicit that you want to start at the beginning with the assessment.
+
+### Option 2: Speedrun a bug issue
+
+If you want the workflow to run through every phase without stopping for
+input between steps, use the `/speedrun` command followed by the issue link:
+
+```text
+/speedrun https://github.com/llamastack/llama-stack/issues/5119
+```
+
+See [Speedrun mode](#speedrun-mode) below for details on what this does and
+when to use it.
+
+### Option 3: Describe the bug yourself
+
+You do not need a GitHub issue at all. You can describe the bug in your own
+words and provide a link to the repository:
+
+```text
+The Milvus vector store integration rejects collection names that contain
+hyphens. Repo: https://github.com/llamastack/llama-stack
+```
+
+The workflow will clone the repo and proceed from there. This works with or
+without `/speedrun`. Prefix your description with `/speedrun` to run through
+all phases automatically, or leave it off to step through interactively.
+
+## Workflow Phases
+
+The Bug Fix workflow is organized into a series of phases. The in-product
+greeting summarizes six core phases (Assess through Document), but in practice
+the full workflow includes eight: the six core phases plus Review (an optional
+quality check) and PR (to submit the fix). All eight are described below.
+
+In the default interactive mode the workflow completes one phase at a time,
+presents you with results and recommendations, and then waits for you to decide
+what to do next. You can follow the suggested order, skip ahead, or go back to
+revisit an earlier phase at any point.
+
+Most phases produce a **report**, a Markdown file you can view in the
+**Files** section of the Explorer panel. These reports are internal to
+your session (they are not published to GitHub or anywhere else) and serve
+two purposes:
+
+1. **Visibility for you.** The reports give you a deeper view of what the
+   workflow found and decided at each step, so you can provide more informed
+   input and steer the process effectively.
+
+2. **Memory for the workflow.** The platform can only keep a finite amount of
+   context in memory at a time. By the time the workflow reaches the Test or
+   Review phase, for example, the details of the original assessment may no
+   longer be in its working context. The written reports let later phases refer
+   back to earlier analysis without losing important details.
+
+### Assess
+
+**Command:** `/assess`
+
+The first phase reads the bug report (or your description) and presents a
+summary of its understanding: what the bug is, where it likely occurs, what
+information is available, what is missing, and a proposed plan for
+reproducing it. No code is changed or executed in this phase; it is purely
+analysis and planning.
+
+This is your chance to correct any misunderstandings or fill in missing
+details before work begins.
+
+**Report:** `artifacts/bugfix/reports/assessment.md`
+
+### Reproduce
+
+**Command:** `/reproduce`
+
+This phase attempts to reproduce the bug in a controlled environment. It
+follows the plan from the Assess phase, documents the steps taken, and records
+what happened. Even a failed reproduction attempt is documented, since
+understanding *why* a bug is hard to reproduce is useful information for
+diagnosis.
+
+**Report:** `artifacts/bugfix/reports/reproduction.md`
+
+### Diagnose
+
+**Command:** `/diagnose`
+
+Root cause analysis. The workflow traces through the code, examines git
+history, forms hypotheses about what is going wrong, and tests them. The goal
+is to understand *why* the bug happens, not just *what* happens. The diagnosis
+also assesses how much of the codebase is affected and recommends an approach
+for the fix.
+
+**Report:** `artifacts/bugfix/analysis/root-cause.md`
+
+### Fix
+
+**Command:** `/fix`
+
+Implements the bug fix. The workflow creates a feature branch, makes the
+minimal code changes needed to resolve the root cause, runs linters and
+formatters, and documents the implementation choices it made.
+
+**Report:** `artifacts/bugfix/fixes/implementation-notes.md`
+
+### Test
+
+**Command:** `/test`
+
+Verifies the fix. The workflow creates regression tests that fail without the
+fix and pass with it, runs the project's full test suite to check for
+unintended side effects, and performs manual verification of the original
+reproduction steps.
+
+**Report:** `artifacts/bugfix/tests/verification.md`
+
+### Review
+
+**Command:** `/review`
+
+An optional but recommended self-review phase. The workflow steps back and
+critically evaluates the fix and tests: Does the fix address the root cause or
+just suppress a symptom? Do the tests actually prove the bug is resolved, or
+could they be hiding problems? The review produces a verdict:
+
+- **Fix and tests are solid.** Ready to proceed to documentation and PR.
+- **Fix is adequate but tests are incomplete.** Additional testing is
+  recommended before proceeding.
+- **Fix is inadequate.** The fix needs more work. The workflow will suggest
+  going back to the Fix phase with specific guidance.
+
+**Report:** `artifacts/bugfix/review/verdict.md`
+
+### Document
+
+**Command:** `/document`
+
+Creates the supporting documentation for the fix: release notes, a changelog
+entry, an issue update, and a draft pull request description.
+
+**Reports:** `artifacts/bugfix/docs/` (multiple files including
+`release-notes.md`, `changelog-entry.md`, and `pr-description.md`)
+
+### PR
+
+**Command:** `/pr`
+
+The final phase. The workflow pushes the feature branch to a fork and creates a
+draft pull request against the upstream repository. If automated PR creation
+fails for any reason (e.g., missing permissions), it provides instructions for
+creating the PR manually.
+
+## Speedrun Mode
+
+**Command:** `/speedrun`
+
+Speedrun mode runs through all remaining phases in sequence without pausing for
+your input between steps. It is useful when you have a well-defined bug and
+trust the workflow to handle the full lifecycle autonomously.
+
+Even in speedrun mode, the workflow will stop and ask you for guidance if it
+hits a situation that needs human judgment, such as when the root cause is
+unclear, if there are multiple valid fix approaches with different trade-offs,
+or if a security concern arises. It will also stop if it hits an obstacle it
+cannot get past on its own, for example if you gave it a link to a repository
+that does not exist.
+
+You can also interrupt a speedrun at any time by clicking the **stop** button
+in the chat UI. Once stopped, you can interact with the session freely: review
+what has been done so far, request changes, provide additional context, or tell
+it to continue the speedrun from where it left off.
+
+### Why speedrun is not the default
+
+The default interactive mode pauses after each phase so you can review the
+results and steer the process. For many bugs, especially complex ones or bugs
+where the report is incomplete or ambiguous, this deliberate pacing is
+valuable. Reviewing the assessment before reproduction begins, or checking the
+diagnosis before a fix is attempted, lets you catch mistakes early and provide
+context that the workflow might not have.
+
+Speedrun is best suited for well-understood bugs where you are confident the
+report contains enough information for the workflow to proceed on its own.
+
+### Speedrun examples
+
+Run from the beginning with a bug issue link:
+
+```text
+/speedrun https://github.com/llamastack/llama-stack/issues/5119
+```
+
+Continue from wherever you are in the flow (the workflow detects which phases are already complete):
+
+```text
+/speedrun
+```
+
+Jump ahead to a specific phase:
+
+```text
+/speedrun Jump ahead to /fix
+```
+
+## Viewing Reports and Artifacts
+
+As the workflow progresses, reports and other artifacts are written to the
+`artifacts/bugfix/` directory. You can view these files at any time in the
+**Files** section of the Explorer panel. The reports are Markdown files that
+provide a detailed record of each phase's analysis, decisions, and outcomes.
+
+## Automation (for advanced users)
+
+Everything above describes using the Bug Fix workflow through the interactive
+UI. The Ambient Code Platform also supports triggering sessions
+programmatically, so you can incorporate bug fixing into CI/CD pipelines,
+scheduled jobs, or custom tooling.
+
+### How it works
+
+Under the hood, creating a session is a single HTTP POST to the platform's
+backend API. The request body includes the prompt, the repositories to clone,
+and an `activeWorkflow` object that tells the platform which workflow to load.
+Anything that can make an authenticated HTTP request can create a bug fix
+session.
+
+Here is the equivalent `curl` call:
+
+```bash
+curl -X POST \
+  "${ACP_API_URL}/projects/${ACP_PROJECT}/agentic-sessions" \
+  -H "Authorization: Bearer ${ACP_TOKEN}" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "initialPrompt": "/speedrun https://github.com/llamastack/llama-stack/issues/5119",
+    "activeWorkflow": {
+      "gitUrl": "https://github.com/ambient-code/workflows",
+      "branch": "main",
+      "path": "workflows/bugfix"
+    },
+    "repos": [
+      {"url": "https://github.com/llamastack/llama-stack", "branch": "main", "autoPush": true}
+    ],
+    "llmSettings": {"model": "claude-sonnet-4-5"},
+    "timeout": 1800
+  }'
+```
+
+The key fields are:
+
+- **`initialPrompt`** is what the agent sees as its first instruction. This is
+  where you pass the bug description, issue link, or `/speedrun` command.
+- **`activeWorkflow`** tells the platform which workflow to load. For the Bug
+  Fix workflow, point it at this repository with the path `workflows/bugfix`.
+  If you omit this field, the session starts with no workflow.
+- **`repos`** is an array of repositories to clone into the session. Set
+  `autoPush` to `true` if you want the agent to push its fix automatically.
+- **`llmSettings.model`** selects the model.
+- **`timeout`** is the session timeout in seconds.
+
+Authentication uses a bearer token in the `Authorization` header.
+
+### GitHub Action
+
+The [`ambient-action`](https://github.com/ambient-code/ambient-action) GitHub
+Action wraps this API call for use in GitHub workflows. You can use it to
+automatically kick off a bug fix session when a new issue is opened, when a
+label is applied, or on any other GitHub event.
+
+The action supports two modes:
+
+- **Fire-and-forget.** Create the session and let the GitHub workflow continue.
+  The agent runs in the background.
+- **Wait-for-completion.** Block the GitHub workflow until the session finishes
+  (or times out), then use the session result in subsequent steps.
+
+Here is an example that triggers a bug fix speedrun whenever an issue is
+labeled `auto-fix`:
+
+```yaml
+name: Auto Bug Fix
+on:
+  issues:
+    types: [labeled]
+
+jobs:
+  fix:
+    if: github.event.label.name == 'auto-fix'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: ambient-code/ambient-action@v0.0.2
+        with:
+          api-url: ${{ secrets.ACP_URL }}
+          api-token: ${{ secrets.ACP_TOKEN }}
+          project: my-team
+          prompt: |
+            /speedrun https://github.com/${{ github.repository }}/issues/${{ github.event.issue.number }}
+          repos: |
+            [{"url": "https://github.com/${{ github.repository }}", "branch": "main", "autoPush": true}]
+          workflow: |
+            {"gitUrl": "https://github.com/ambient-code/workflows", "branch": "main", "path": "workflows/bugfix"}
+          wait: true
+          timeout: 30
+```
+
+When `wait` is `true`, the action outputs `session-name`, `session-uid`,
+`session-phase`, and `session-result`, which you can use in subsequent workflow
+steps. See the
+[action repository](https://github.com/ambient-code/ambient-action) for the
+full list of inputs and outputs.
+
+### Tools that do NOT yet support workflows
+
+Several other tools can create and manage ACP sessions. At the time of writing,
+none of them support setting `activeWorkflow`, which means they cannot load the
+structured Bug Fix workflow described in this tutorial. They will create a
+session, but it will not have the phases, commands, or reports that the workflow
+provides.
+
+- **[`acpctl`](https://github.com/ambient-code/platform/tree/main/components/ambient-cli)**
+  is a command-line tool for the platform. It can create sessions and check
+  their status, but does not have a flag for specifying a workflow.
+- **[`mcp-acp`](https://github.com/ambient-code/mcp)** is an MCP server that
+  lets you manage ACP sessions from Claude Desktop, Claude Code, or any
+  MCP-compatible client. It has a "bugfix" template, but that template only
+  sets a generic prompt and model. It does not load the Bug Fix workflow.
+- **[Ambient Platform SDKs](https://github.com/ambient-code/platform/tree/main/components/ambient-sdk)**
+  provide client libraries in Go, Python, and TypeScript for programmatic
+  session management.
+
+If you want to automate bug fix sessions from a script, CI pipeline, or any
+other environment, you do not need any of these tools. The platform's backend
+API accepts a straightforward JSON POST request (as shown in the `curl` example
+above). The `activeWorkflow` field in that request is what tells the platform to
+load the Bug Fix workflow into the session. Any HTTP client in any language can
+make that call. The GitHub Action is just a convenience wrapper that does the
+same thing and adds polling for completion.