Custom Skills

A skill is a markdown file that captures how your team does a specific thing — tuning an EKF, calibrating an IMU, writing a Gazebo plugin, structuring a launch file, picking damping values for a wheel. Drop it in the right place and Drift uses it automatically, without you copy-pasting the procedure into every prompt. If DRIFT.md is “what is true about this project”, skills are “how do we do specific things around here”.

Adding a skill

The fastest way:

/skill add ./team-docs/ekf-tuning.md

This copies the file to ~/.drift/skills/<name>/SKILL.md and registers it as a user-global skill — active in every workspace on this machine. To install it as a project-scoped skill instead (lives inside your repo, ships when you commit it):

/skill add ./team-docs/ekf-tuning.md --repo

That copies the file to <repoRoot>/.drift/skills/<name>/SKILL.md so anyone who clones the repo picks it up automatically. Or in plain English at the prompt:

add this skill: ./team-docs/ekf-tuning.md

Drift validates the file, copies it into the right managed location, distils it (so the agent has a fast lookup index), and confirms which prompt categories it’ll trigger on (build, simulation, robot description, debugging, etc.).

A loose skills.md in your workspace root is not picked up. The convention is one directory per skill, with the file literally named SKILL.md inside it (e.g. <repo>/.drift/skills/ekf-tuning/SKILL.md). /skill add <path> does the directory-and-rename housekeeping for you.

What goes in a `SKILL.md`

A skill has a short YAML front-matter block plus the actual procedure as markdown:

---
name: ekf-tuning
description: How we tune an Extended Kalman Filter for our differential-drive robots
applies_to:
  - SIMULATION
  - ROBOT_DESCRIPTION
---

# EKF Tuning for differential-drive robots

## Default starting params
- process_noise_covariance: diag([0.05, 0.05, 0.06, 0.03, 0.03, 0.06])
- initial_estimate_covariance: diag([1e-9] * 15)
- Use `imu0` and `odom0` only — never fuse a third source on first pass

## When the estimate drifts during straight-line motion
1. Check the IMU bias estimation is converging (`/diagnostics`)
2. Bump `process_noise_covariance[5]` (yaw) by 1.5×
3. If still drifting, the wheel-odometry covariance is too tight — relax 2×

## Coordinate frame conventions
- Always REP-105: `map -> odom -> base_link`
- Never publish `map -> base_link` directly

The front-matter helps Drift decide when the skill is relevant (applies_to is a list of categories — Drift will load the skill for prompts that match). The body is plain markdown; write it the way you’d explain it to a new hire.

Listing and removing

/skill list

Shows every skill currently active for this workspace, plus where it was discovered from (workspace-local or user-global).

/skill remove ekf-tuning

Drops the skill. The file is moved out of the active path; the agent stops using it on the next prompt. Two patterns work well:

Pattern 1: skills in the project repo

Commit .drift/skills/ under your project repo. Anyone who clones the project gets your skills automatically:

warehouse_bot/
├── DRIFT.md
├── .drift/
│   └── skills/
│       ├── ekf-tuning/SKILL.md
│       └── gazebo-plugin/SKILL.md
├── src/
└── ...

/skill add <path> --repo installs into exactly this layout. This is the right pattern for project-specific procedures.

Pattern 2: skills in a dedicated team repo

Keep a separate team-skills repo. Each developer runs:

git clone git@github.com:your-team/team-skills.git ~/team-skills

Then in Drift:

/skill add ~/team-skills/ekf-tuning.md
/skill add ~/team-skills/launch-conventions.md

This is the right pattern for cross-project conventions (build flags, launch-file structure, naming rules).

Importing a Claude Code or Cursor skill

Skills are opt-in: Drift loads only the skills you explicitly added, and it reads them from .drift/skills/ only. A .claude/skills/ directory is not scanned — your Claude Code skills are mostly not robotics, and Drift will not silently distill and upload them. Importing one is a one-liner. /skill add copies it into .drift/skills/, where Drift will read it:

/skill add ~/.claude/skills/ekf-tuning/SKILL.md

Project context files behave differently from skills. CLAUDE.md, AGENTS.md, and DRIFT.md are all read automatically — see Project Context. It’s only SKILL.md files that must live under .drift/skills/.

Examples of skills worth writing

Things our users have written skills for:

EKF / UKF tuning — process noise, observation models, fallback ladders
Launch-file conventions — how to structure main.launch.py vs bringup.launch.py
URDF practices — inertia formulas, collision-geometry rules, joint-naming convention
MJCF conventions — chassis-z spawn rules, wheel friction/condim defaults, integrator picks
Build / colcon discipline — packages-up-to flags, symlink-install rule, what’s vendored
Gazebo plugin authoring — how your team writes a sensor plugin
Topic-naming conventions — prefix rules, namespacing, what’s published where
Hardware bring-up — how a new robot is brought online for the first time

Anything that takes more than two sentences to explain to a new teammate is a candidate.

Don’t put in a skill

Code. Skills are procedures, not source. The agent already reads your code.
One-off fixes. A note on something that happened once doesn’t belong in a skill — it’s noise.
Things that change weekly. Skills should be relatively stable. For volatile state, just say it in the prompt.
Secrets. Plain markdown file; treat accordingly.

Combining skills with project context

DRIFT.md and skills work together:

DRIFT.md says “our cmd_vel topic is /warehouse_bot/cmd_vel”.
A skill says “to debug a wheel that doesn’t turn, check: 1. topic connection, 2. controller chain, 3. PID gains, 4. URDF axis alignment”.

DRIFT.md is facts. Skills are procedures. The agent gets both, in the right contexts, automatically.

Next steps

Project Context

The companion file format — facts about your project.

Commands Reference

Full /skill subcommand reference.

Getting Started

Guides

Robot Showcase

Reference

Changelog

Custom Skills

Adding a skill

What goes in a `SKILL.md`

Listing and removing

Pattern 1: skills in the project repo

Pattern 2: skills in a dedicated team repo

Importing a Claude Code or Cursor skill

Examples of skills worth writing

Don’t put in a skill

Combining skills with project context

Next steps

Project Context

Commands Reference

​Adding a skill

​What goes in a SKILL.md

​Listing and removing

​Sharing skills across the team

​Pattern 1: skills in the project repo

​Pattern 2: skills in a dedicated team repo

​Importing a Claude Code or Cursor skill

​Examples of skills worth writing

​Don’t put in a skill

​Combining skills with project context

​Next steps

Project Context

Commands Reference

Adding a skill

What goes in a `SKILL.md`

Listing and removing

Sharing skills across the team

Pattern 1: skills in the project repo

Pattern 2: skills in a dedicated team repo

Importing a Claude Code or Cursor skill

Examples of skills worth writing

Don’t put in a skill

Combining skills with project context

Next steps