In MuleSoft Vibes, use skills for reusable instructions that apply to a matching task, rules for constraints that should persist across conversations or within a workspace, and workflows for named, repeatable sequences invoked with slash commands. MuleSoft’s documentation describes these three controls and how to share workspace rules and skills through GitHub. It does not establish a configurable Vibes hooks feature, so there is no documented hook setup to recommend.
What each Vibes control is for
MuleSoft Vibes is a natural-language development assistant in Anypoint Code Builder for API specifications, integrations, and related development work. Skills, rules, and workflows shape its behavior in different ways; they are not interchangeable configuration labels.
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| Control | Scope | How it applies | Content | Where it can live |
|---|---|---|---|---|
| Skill | A task or type of work | Loads when a request matches the skill description | Reusable instructions and optional supporting resources | Default skills, local setup, or workspace files under .a4drules/skills/ |
| Rule | Global or active workspace | Applies as an ongoing natural-language constraint | A requirement, condition, or preferred response | Vibes settings or markdown files directly in .a4drules/ |
| Workflow | A named repeatable task | Invoked from the Vibes panel, including through a slash command | Optional description and predefined steps | Created in Vibes; the cited GitHub sharing instructions document shared rules and skills, not workflow files |
MuleSoft explains that skills load as needed rather than occupying context for unrelated work, unlike workspace rules that stay active across conversations. See Using Skills with MuleSoft Vibes and Workflows and Rules.
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When to choose a skill, rule, or workflow
Choose a skill for task-specific expertise
Use a skill when a reusable set of instructions should apply to a particular kind of request, rather than every conversation. MuleSoft’s default skills cover tasks such as building Mule integrations, securing applications, configuring run settings, and upgrading Mule apps. A skill may also include supporting resources, such as reference material, assets, or scripts.
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Choose a rule for a continuing constraint
Use a rule for expectations that should shape work generally or throughout the active workspace: naming conventions, API version information, or security checks are examples in MuleSoft’s documentation. A useful rule says what condition matters and what Vibes should do when it is not met.
Choose a workflow for a repeatable sequence
Use a workflow when a named task needs the same ordered steps each time. MuleSoft describes workflows as predefined multi-step tasks that Vibes executes automatically. Examples include API design review, API creation, and troubleshooting. The workflow can be invoked in the Vibes panel with a command such as /api-design-review.
Set up workspace rules and skills in a GitHub repository
To share rules and skills with teammates, put the documented .a4drules structure at the root of the repository opened as the Vibes workspace:
.a4drules/
├── api-conventions.md
└── skills/
└── mule-api-review/
├── SKILL.md
└── references/
└── review-checklist.md- Place shared rule markdown files directly in
.a4drules/. - Give each skill its own directory under
.a4drules/skills/, with its instructions inSKILL.md. - Put optional supporting files in subdirectories such as
references/,assets/, orscripts/. - Open the repository root as the Vibes workspace. Opening a parent or child folder instead may prevent the expected rules and skills from appearing.
MuleSoft says Vibes loads these files for the open workspace. Global rules and skills remain on the local machine rather than becoming part of the repository. The documented structure and workspace-loading behavior are in Sharing Rules and Skills from GitHub with MuleSoft Vibes.
Write rules that give Vibes a clear response to follow
A vague preference is harder to apply consistently than a constraint with a condition and an action. MuleSoft’s rule example asks Vibes to enforce a RAML naming pattern and, when a title or base URI does not match, warn and provide a corrected value. Its shared error-handling example gives explicit guidance on On Error Propagate, On Error Continue, and logging the error type and correlation ID.
To add a rule in the UI, open Vibes settings, add a rule, enter the instruction, and save it. For a team-wide workspace rule, store the instruction as a markdown file in the repository’s .a4drules/ directory instead.
Make workflows reviewable, not just repeatable
A workflow should spell out the checks and expected output in the order they should happen. MuleSoft’s API design review example checks RAML syntax and metadata, naming rules, and unsecured endpoints, then summarizes issues. A team can make that sequence actionable by asking for required fixes and suggestions in the summary.
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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Do not treat a workflow review as formal governance validation. MuleSoft’s API-specification guidance says governance is not included in the described validation. For API creation, inspect the generated specification and understand the approval setting: the documentation notes that file changes may require approval when auto-approve is disabled. See Workflows and Rules and Creating API Specs with MuleSoft Vibes.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What is known about Vibes hooks
The MuleSoft pages cited here document skills, rules, workflows, slash commands, settings, and repository files, but do not define a configurable hooks feature or explain hook behavior. They do not establish hook file names, lifecycle triggers, or execution commands. Treat hooks as undocumented in these sources rather than borrowing setup instructions from another tool or assuming Vibes supports the same mechanism.
Quick Recap
Practical setup sequence
- Confirm access and prerequisites. Set up Anypoint Code Builder for the intended Vibes work. MuleSoft’s integration guidance names the Mule Developer Generative AI User permission and enabling Einstein in Access Management as prerequisites. Check the current Creating Integrations with MuleSoft Vibes guidance for the work you plan to do.
- Classify each instruction. Make it a skill if it is task-specific, a rule if it should persist, or a workflow if it defines a repeatable sequence.
- Choose the right home. Add rules and workflows in Vibes; put shared workspace rules and skills in the repository’s
.a4drulesstructure. - Use specific examples and steps. Make constraints testable and workflow outputs clear, then review the generated specifications or code.
- Do not implement assumed hooks. Use only a hook mechanism documented for Vibes if a current authoritative specification becomes available.
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