modules

name	modules
description	This skill should be used when the user asks to "create a module", "install module", "update module", "patch module", "lint module", "create subworkflow", "install subworkflow", "update subworkflow", or any `nf-core modules` or `nf-core subworkflows` operation.
version	0.1.0

nf-core Modules & Subworkflows

Manage modules and subworkflows: create, install, update, patch, and lint.

Read ${CLAUDE_PLUGIN_ROOT}/shared/conventions.md for nf-core conventions and package manager setup. Read ${CLAUDE_PLUGIN_ROOT}/shared/module-template.md for module structure and templates.

---

nf-core Migration Roadmap

Update this table as Nextflow and nf-core evolve. Last updated: Feb 2026.

Feature	Enforce?	Allow in Linting	In Template	Required	Notes
Strict syntax	ENFORCE	—	Q2 2026	Q2 2026	CRITICAL deadline. Run nextflow lint .
Version topics in modules	ENFORCE	Q4 2025	Mid-2026	Mid-2026	Already allowed by linting
Workflow output	Don't enforce	—	Mid-2026	Q4 2026	Coming soon
Static types & records	Don't enforce	Mid-2026	Q4 2026	Q2 2027	Gradual rollout
New process syntax	Don't enforce	Mid-2026	Q4 2026	Q2 2027	Gradual rollout

---

Quick Commands — Modules

Replace <cmd> with the configured package manager prefix (see Setup in conventions.md).

Action	Command
List remote modules	<cmd> nf-core modules list remote
List installed modules	<cmd> nf-core modules list local
Module info	<cmd> nf-core modules info <module>
Install module	<cmd> nf-core modules install <tool/subtool>
Install specific version	<cmd> nf-core modules install <module> --sha <commit>
Create module	<cmd> nf-core modules create tool/subtool
Update module	<cmd> nf-core modules update <module>
Update all	<cmd> nf-core modules update --all
Preview updates	<cmd> nf-core modules update --preview
Create patch	<cmd> nf-core modules patch <module>
Remove patch	<cmd> nf-core modules patch <module> --remove
Lint module	<cmd> nf-core modules lint <module>
Lint all	<cmd> nf-core modules lint --all
Test module	<cmd> nf-test test modules/nf-core/<tool>/<subtool>/

Quick Commands — Subworkflows

Action	Command
List remote	<cmd> nf-core subworkflows list remote
List installed	<cmd> nf-core subworkflows list local
Install	<cmd> nf-core subworkflows install <name>
Create	<cmd> nf-core subworkflows create
Update	<cmd> nf-core subworkflows update <name>
Update all	<cmd> nf-core subworkflows update --all
Lint	<cmd> nf-core subworkflows lint <name>
Test	<cmd> nf-test test subworkflows/nf-core/<name>/

---

Module Lifecycle

Create

Module naming: tool or tool/subtool, lowercase only. Examples: fastqc, bwa/mem, samtools/sort.

<cmd> nf-core modules create tool/subtool

See ${CLAUDE_PLUGIN_ROOT}/shared/module-template.md for the complete main.nf template, meta.yml structure, and container sources.

Process:

1. Check Bioconda for tool availability
2. Run create command to generate scaffold
3. Edit main.nf — implement process logic
4. Update meta.yml — document inputs, outputs
5. Write nf-test tests
6. Lint: <cmd> nf-core modules lint tool/subtool

Install

<cmd> nf-core modules install <tool/subtool>

Installs to modules/nf-core/<tool>/<subtool>/.

Integration example:

include { FASTQC } from '../modules/nf-core/fastqc/main'

workflow MY_WORKFLOW {
    take:
    reads  // channel: [ val(meta), path(reads) ]

    main:
    FASTQC ( reads )

    emit:
    zip  = FASTQC.out.zip
    html = FASTQC.out.html
}

Configure ext.args:

// conf/modules.config
process {
    withName: FASTQC {
        ext.args = '--quiet'
        publishDir = [
            path: { "${params.outdir}/fastqc" },
            mode: params.publish_dir_mode,
            saveAs: { filename -> filename.equals('versions.yml') ? null : filename }
        ]
    }
}

Update

<cmd> nf-core modules update <module>          # Update one
<cmd> nf-core modules update --all             # Update all
<cmd> nf-core modules update --preview         # Preview only
<cmd> nf-core modules update <module> --force  # Overwrite local changes
<cmd> nf-core modules update <module> --save-diff updates.patch  # Save as patch

Modules are tracked in modules.json with git SHA and branch info.

Workflow: Preview → Update → Test → Commit

<cmd> nf-core modules update <module> --preview
<cmd> nf-core modules update <module>
<cmd> nf-test test modules/nf-core/<module>/
git add modules/nf-core/<module>/ modules.json && git commit -m "Update <module>"

Patch

Use patches to preserve local modifications across module updates.

When to patch vs. local module:

• Patch: Small, focused changes (custom args, label change, conditional logic)
• Local module: Extensive changes (>50% of code), very different usage

# 1. Install and modify module
<cmd> nf-core modules install fastqc
# Edit modules/nf-core/fastqc/main.nf

# 2. Create patch
<cmd> nf-core modules patch fastqc
# Creates modules/nf-core/fastqc/.nf-core-patch.yaml

# 3. On update, patch auto-applies
<cmd> nf-core modules update fastqc

Remove patch:

<cmd> nf-core modules patch fastqc --remove

---

Subworkflow Lifecycle

Subworkflows combine multiple modules into reusable workflow units.

Install

<cmd> nf-core subworkflows install bam_sort_stats_samtools

Installs to subworkflows/nf-core/<name>/ with main.nf, meta.yml, and tests/.

Usage:

include { BAM_SORT_STATS_SAMTOOLS } from '../subworkflows/nf-core/bam_sort_stats_samtools/main'

workflow {
    BAM_SORT_STATS_SAMTOOLS ( bam_ch, fasta, fai )
}

Create

<cmd> nf-core subworkflows create

Subworkflow main.nf structure:

include { MODULE_ONE } from '../../../modules/nf-core/module_one/main'
include { MODULE_TWO } from '../../../modules/nf-core/module_two/main'

workflow MY_SUBWORKFLOW {
    take:
    input_channel
    reference

    main:
    ch_versions = channel.empty()

    MODULE_ONE ( input_channel )
    ch_versions = ch_versions.mix(MODULE_ONE.out.versions.first())

    MODULE_TWO ( MODULE_ONE.out.result, reference )
    ch_versions = ch_versions.mix(MODULE_TWO.out.versions.first())

    emit:
    result   = MODULE_TWO.out.output
    versions = ch_versions
}

Update

<cmd> nf-core subworkflows update <name>
<cmd> nf-core subworkflows update --all
<cmd> nf-core subworkflows update --preview

Local vs Remote

• Remote (subworkflows/nf-core/): Installed from nf-core/modules, managed by nf-core tools
• Local (subworkflows/local/): Pipeline-specific, manually maintained

---

Lint Modules & Subworkflows

Running Lint

<cmd> nf-core modules lint <module>        # Lint specific module
<cmd> nf-core modules lint --all           # Lint all modules
<cmd> nf-core subworkflows lint <name>     # Lint specific subworkflow
<cmd> nf-core subworkflows lint --all      # Lint all subworkflows

Common Module Lint Fixes

• Missing meta.yml fields: Add description, keywords, authors
• Missing stub block: Add stub section to process
• Missing versions.yml: Add version reporting output
• Container issues: Pin versions (no :latest), ensure both Docker and Singularity
• Output patterns: Use path("${prefix}.ext") not path("*.ext")

Configuring .nf-core.yml for Module Exceptions

lint:
  modules:
    - name: custom_module
      tests:
        - meta_yml

---

Module Structure Reference

See ${CLAUDE_PLUGIN_ROOT}/shared/module-template.md for complete templates including:

• Standard main.nf process template (input/output/script/stub)
• meta.yml structure
• Container sources (biocontainers, quay.io)
• Module file structure diagram