Phase 1 of Serial Studio's spec-driven workflow: capture WHAT a feature must do and WHY, with no implementation detail.

Custom licenceAuto-check passedDevelopment

Install Ss Spec

skills CLI
$ npx skills add Serial-Studio/Serial-Studio --skill ss-spec -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install Serial-Studio/Serial-Studio ss-spec --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/Serial-Studio/Serial-Studio.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/ss-spec .claude/skills/ss-spec && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
ss-spec
GitHub stars
7.2k
Token cost
~766 tokens
SKILL.md length
326 words
Files
1
Skills in repo
15
Repo updated
First seen
Licence
Custom licence

At a glance

Phase 1 of Serial Studio's spec-driven workflow: capture WHAT a feature must do and WHY, with no implementation detail.

  • Works in 5 steps: Pick the number and slug. The next… → Ground yourself first. Skim the relevant… → Create the directory and copy the template → …
  • Start any non-trivial
  • SKILL.md covers Procedure, Gate and Rules
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Ss Spec is an agent skill from Serial-Studio/Serial-Studio. Phase 1 of Serial Studio's spec-driven workflow: capture WHAT a feature must do and WHY, with no implementation detail. Use to start any non-trivial or multi-file feature — "spec this out", "write a spec", "start a feature", "let's spec-drive X". Produces doc/claude/specs/NNNN-slug/spec.md and gates on human approval before /ss-plan.

Its SKILL.md is about 770 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Spec-driven development and PRD writing. The repository describes itself as: Open-source telemetry dashboard. Supports UART, BLE, MQTT, Modbus, CAN Bus and more.

When your agent uses it

  • Start any non-trivial
  • Multi-file feature — spec this out
  • Start a feature
  • Lets spec-drive X

Example prompts

  • “spec this out”
  • “write a spec”
  • “start a feature”
  • “/ss-spec”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Pick the number and slug. The next number is max(existing) + 1, zero-padded to four
  2. Ground yourself first. Skim the relevant doc/claude/ sub-doc(s) for the area so the
  3. Create the directory and copy the template
  4. Write the spec into every section: Problem/Motivation, Goals, Non-Goals, Requirements
  5. Resolve ambiguity before finishing. Where a requirement is genuinely the maintainer's

What it can do on your machine

Read from SKILL.md and the folder at commit 34c87a4. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are bash).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Ss Spec loads about 766 tokens when it runs. Until then it costs about 86 tokens; SKILL.md has 326 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~86
When it runs · the whole SKILL.md, loaded when a task matches
~766

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 326 words (~766 tokens).

“Capture the WHAT and the WHY. No file paths, class names, signal wiring, or algorithm choices — those belong to /ss-plan. A spec that leaks implementation pre-commits the design before it has been reviewed. See doc/claude/spec-driven.md for the full workflow…”

— opening of SKILL.md by Serial-Studio, Custom licence
name
ss-spec
argument-hint
[feature name or one-line description]

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .claude/skills/ss-spec of Serial-Studio/Serial-Studio.

Open the folder on GitHubat commit 34c87a4

Compare with similar skills

Ss Spec next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Ss Spec compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Ss Spec this skillSerial-Studio/Serial-Studio7.2k—~766Automated safety check: PassCustom licence
CCPM Project Managementautomazeio/ccpm8.4k—~1.1kAutomated safety check: PassMIT
Spec-Driven Developmentaddyosmani/agent-skills102k1 repos~3.2kAutomated safety check: PassMIT
Sagawarpdotdev/common-skills606—~4.1kAutomated safety check: PassMIT
Speckit Clarifykunstmusik/blue15417 repos~4.9kAutomated safety check: PassGPL-3.0
User Alignment and Agent-Ready PRDstryproduck/produck-skills511—~5.3kAutomated safety check: PassApache-2.0

Similar skills

  • Runs a spec-driven workflow from PRD to epic to GitHub issues to parallel agents, with status, standup and blocked-work reports from bundled scripts.

    8.4k GitHub stars~1.1k tokensUpdated 6 mo ago
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  • Spec-Driven Development

    addyosmani/agent-skills

    Writes a structured specification before any code, moving through gated specify, plan, tasks and implement phases, with an optional capability map for multi-part requests.

    102k GitHub starsUsed in 1 repo~3.2k tokens
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  • Saga

    warpdotdev/common-skills

    Run an autonomous, spec-driven development "saga" for medium-to-large features using an orchestrator agent and a fleet of worker subagents.

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  • Speckit Clarify

    kunstmusik/blue

    Identify underspecified areas in the current feature spec by asking up to 5 highly targeted clarification questions and encoding answers back into the spec.

    154 GitHub starsUsed in 17 repos~4.9k tokens
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  • User Alignment and Agent-Ready PRDs

    tryproduck/produck-skills

    Turns a vague feature request into a written spec with scope, phases, acceptance criteria and do-not-do limits that a coding agent can follow without guessing.

    511 GitHub stars~5.3k tokensUpdated 1 mo ago
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  • Oft Spec Driven Development

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  • Qt Qml Review

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  • Cpp Compiler Flags

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  • Ss Cpp Modern

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  • Ss Docs

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    Write, update, or review Serial Studio's user-facing documentation: the doc/help manual, README.md, and examples READMEs.

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Questions about Ss Spec

What does Ss Spec do?

Phase 1 of Serial Studio's spec-driven workflow: capture WHAT a feature must do and WHY, with no implementation detail. Ss Spec is an agent skill from Serial-Studio/Serial-Studio. Phase 1 of Serial Studio's spec-driven workflow: capture WHAT a feature must do and WHY, with no implementation detail.

When should I use Ss Spec?

Ss Spec fits situations like: start any non-trivial; multi-file feature — spec this out; start a feature; lets spec-drive X.

How do I install Ss Spec in Claude Code?

Run `npx skills add Serial-Studio/Serial-Studio --skill ss-spec -a claude-code`. Or copy the skill folder (.claude/skills/ss-spec in Serial-Studio/Serial-Studio) into .claude/skills/ss-spec in your project. Claude Code loads it when a task matches its description.

How do I install Ss Spec in Codex?

Run `npx skills add Serial-Studio/Serial-Studio --skill ss-spec -a codex`. Or copy the skill folder (.claude/skills/ss-spec in Serial-Studio/Serial-Studio) into .agents/skills/ss-spec in your project. Codex loads it when a task matches its description.

Can I use Ss Spec in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add Serial-Studio/Serial-Studio --skill ss-spec -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ss-spec, .gemini/skills/ss-spec, .github/skills/ss-spec and .opencode/skills/ss-spec in your project.

What does Ss Spec need to run?

SKILL.md names no scripts, command-line tools or credentials: Ss Spec is instructions for the agent only.

Does Ss Spec access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Ss Spec safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Ss Spec use?

Ss Spec has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Ss Spec use?

About 766 tokens (SKILL.md is roughly 3.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Ss Spec?

Skills that share tags, products or a category with Ss Spec: CCPM Project Management (automazeio/ccpm, 8.4k stars), Spec-Driven Development (addyosmani/agent-skills, 102k stars), Saga (warpdotdev/common-skills, 606 stars) and Speckit Clarify (kunstmusik/blue, 154 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Ss Spec?

Serial-Studio (a GitHub organization) maintains it in Serial-Studio/Serial-Studio, which has 7,224 GitHub stars. The repository holds 15 skills in this directory. The repository was last updated on October 6, 2026.

Source: Serial-Studio/Serial-Studio on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.