Agent skill

Validate

by rsmdt in rsmdt/the-startup

Validate in any of six modes — spec quality, single-file review, spec-to-implementation drift, constitution rule enforcement, comparison between two artifacts, or sanity-checking your understanding.

MITAuto-check passed

Install Validate

skills CLI
$ npx skills add rsmdt/the-startup --skill validate -a claude-code

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

GitHub CLI
$ gh skill install rsmdt/the-startup validate --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/rsmdt/the-startup.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/start/skills/validate .claude/skills/validate && 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
validate
GitHub stars
536
Token cost
~1.3k tokens
SKILL.md length
456 words
Files
8
Skills in repo
27
Repo updated
First seen
Licence
MIT

At a glance

Validate in any of six modes — spec quality, single-file review, spec-to-implementation drift, constitution rule enforcement, comparison between two artifacts, or sanity-checking your understanding.

  • Works in 6 steps: Parse Mode → Gather Context → Select Mode → …
  • Checking a spec by ID
  • SKILL.md covers Persona, Interface, Constraints and Reference Materials, plus 2 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Validate is an agent skill from rsmdt/the-startup. Validate in any of six modes — spec quality, single-file review, spec-to-implementation drift, constitution rule enforcement, comparison between two artifacts, or sanity-checking your understanding. Use when checking a spec by ID, validating a file by path, detecting drift, enforcing constitution rules, comparing two sources ("$X against $Y"), or asking a freeform validation question.

Its SKILL.md is about 1.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 9 other files (for example `examples/output-example.md`, `reference/3cs-framework.md` and `reference/ambiguity-detection.md`).

The repository describes itself as: The Agentic Startup - A collection of Claude Code commands, skills, and agents. The licence is MIT.

When your agent uses it

  • Checking a spec by ID
  • Validating a file by path
  • Detecting drift
  • Enforcing constitution rules

Example prompts

  • “$X against $Y”
  • “/validate”

Workflow steps

6 steps, taken from the step headings in SKILL.md.

  1. Parse Mode
  2. Gather Context
  3. Select Mode
  4. Launch Validation
  5. Synthesize Findings
  6. Next Steps

What it can do on your machine

Read from SKILL.md and the folder at commit 88d447c. 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.

    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

Validate loads about 1.3k tokens when it runs. Until then it costs about 99 tokens; SKILL.md has 456 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~99
When it runs · the whole SKILL.md, loaded when a task matches
~1.3k

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

The full file from rsmdt/the-startup at commit 88d447c, republished under its MIT licence (© rsmdt). 456 words, ~1,253 tokens.

Download SKILL.mdSave it as .claude/skills/validate/SKILL.md (or your agent's skills folder). This skill also uses 7 other files; get the full folder from GitHub.
name
validate
description
Validate in any of six modes — spec quality, single-file review, spec-to-implementation drift, constitution rule enforcement, comparison between two artifacts, or sanity-checking your understanding. Use when checking a spec by ID, validating a file by path, detecting drift, enforcing constitution rules, comparing two sources ("$X against $Y"), or asking a freeform validation question.
user-invocable
true
argument-hint
spec ID (e.g., 005), file path, 'constitution', 'drift', or description of what to validate

Persona

Act as a validation orchestrator that ensures quality and correctness across specifications, implementations, and governance.

Validation Request: $ARGUMENTS

Interface

Finding { status: PASS | WARN | FAIL severity: HIGH | MEDIUM | LOW title: string // max 40 chars location: string // file:line issue: string // one sentence recommendation: string // how to fix }

State { target = $ARGUMENTS validationMode: Spec | File | Drift | Constitution | Comparison | Understanding perspectives = [] // from reference/perspectives.md mode: Standard | Agent Team findings: Finding[] }

Constraints

Always:

  • Delegate all validation tasks to specialist agents.
  • Launch ALL applicable validation perspectives simultaneously.
  • Include file paths and line numbers for all findings.
  • Every finding must have a clear, actionable fix recommendation.
  • Advisory by default — provide recommendations without blocking.

Never:

  • Validate code yourself — always delegate to specialist agents.
  • Skip constitution L1/L2 violations — these are blocking.
  • Present findings without specific file:line references.
  • Summarize agent findings — present complete results.

Reference Materials

  • reference/perspectives.md — perspective definitions, activation rules, mode-to-perspective mapping
  • reference/3cs-framework.md — completeness, consistency, correctness validation
  • reference/ambiguity-detection.md — vague language patterns and scoring
  • reference/drift-detection.md — spec-implementation alignment checking
  • reference/constitution-validation.md — governance rule enforcement
  • reference/output-format.md — assessment level definitions, next-step options
  • examples/output-example.md — concrete example of expected output format

Workflow

1. Parse Mode

Determine validation mode from $ARGUMENTS:

match (target) { /^\d{3}/ => Spec Validation file path => File Validation "drift" | "check drift" => Drift Detection "constitution" => Constitution Validation "$X against $Y" => Comparison Validation freeform text => Understanding Validation }

2. Gather Context

match (mode) { Spec Validation => load spec documents (PRD, SDD, PLAN), identify cross-references Drift Detection => load spec + identify implementation files + extract requirements Constitution => check for CONSTITUTION.md, parse rules by category File Validation => read target file + surrounding context Comparison => load both sources for comparison }

3. Select Mode

AskUserQuestion: Standard (default) — parallel fire-and-forget subagents Agent Team — persistent teammates with shared task list and coordination

Recommend Agent Team when: full spec validation | drift + constitution together | 4+ perspectives | multi-document scope.

Show full SKILL.md (169 more words)Show less
4. Launch Validation

Read reference/perspectives.md for the mode-to-perspective mapping.

match (mode) { Standard => launch parallel subagents per applicable perspectives Agent Team => create team, spawn one validator per perspective, assign tasks }

5. Synthesize Findings

Process findings:

  1. Deduplicate by location (within 5 lines), keeping highest severity and merging complementary details.
  2. Sort by severity (descending).
  3. Group by category.

Mode-specific synthesis:

  • Drift: Read reference/drift-detection.md and categorize by type (Scope Creep, Missing, Contradicts, Extra).
  • Constitution: Read reference/constitution-validation.md and separate by level (L1 autofix, L2 manual, L3 advisory).
  • Spec: Read reference/ambiguity-detection.md and include ambiguity score.

assessment = match (failCount, warnCount) { (0, 0) => Excellent (0, 1..3) => Good (0, > 3) => Needs Attention (> 0, _) => Critical }

Read reference/output-format.md and format the report accordingly.

6. Next Steps

match (validationMode) { Constitution => AskUserQuestion: Apply autofixes (L1) | Show violations | Skip Drift => AskUserQuestion: Acknowledge | Update implementation | Update spec | Defer Spec | File => AskUserQuestion: Address failures | Show details | Continue anyway }

Integration with Other Skills

Called by other workflow skills:

  • /start:implement — drift check at phase boundaries, constitution check at checkpoints
  • /start:specify — architecture alignment during SDD phase

© rsmdt, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 7 other files in plugins/start/skills/validate of rsmdt/the-startup.

  • SKILL.md
  • examples/output-example.md
  • reference/3cs-framework.md
  • reference/ambiguity-detection.md
  • reference/constitution-validation.md
  • reference/drift-detection.md
  • reference/output-format.md
  • reference/perspectives.md

Open the folder on GitHubat commit 88d447c

Compare with similar skills

Validate 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.

Validate compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Validate this skillrsmdt/the-startup536—~1.3kAutomated safety check: PassMIT
Dynamic Workflow Modeaffaan-m/ECC274k1 repos~1.3kAutomated safety check: PassMIT
Agent GitHub Modesruvnet/ruflo74k2 repos~1.7kAutomated safety check: PassMIT
Consent Modethedaviddias/Front-End-Checklist74k—~425Automated safety check: PassMIT
Studio Moderemotion-dev/remotion62k—~313Automated safety check: PassCustom licence
Visual Moderemotion-dev/remotion62k—~477Automated safety check: PassCustom licence

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Questions about Validate

What does Validate do?

Validate in any of six modes — spec quality, single-file review, spec-to-implementation drift, constitution rule enforcement, comparison between two artifacts, or sanity-checking your understanding. Validate is an agent skill from rsmdt/the-startup. Validate in any of six modes — spec quality, single-file review, spec-to-implementation drift, constitution rule enforcement, comparison between two artifacts, or sanity-checking your understanding.

When should I use Validate?

Validate fits situations like: checking a spec by ID; validating a file by path; detecting drift; enforcing constitution rules.

How do I install Validate in Claude Code?

Run `npx skills add rsmdt/the-startup --skill validate -a claude-code`. Or copy the skill folder (plugins/start/skills/validate in rsmdt/the-startup) into .claude/skills/validate in your project. Claude Code loads it when a task matches its description.

How do I install Validate in Codex?

Run `npx skills add rsmdt/the-startup --skill validate -a codex`. Or copy the skill folder (plugins/start/skills/validate in rsmdt/the-startup) into .agents/skills/validate in your project. Codex loads it when a task matches its description.

Can I use Validate 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 rsmdt/the-startup --skill validate -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/validate, .gemini/skills/validate, .github/skills/validate and .opencode/skills/validate in your project.

What does Validate need to run?

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

Does Validate 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 Validate 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 Validate use?

Validate is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Validate use?

About 1.3k tokens (SKILL.md is roughly 5k 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 Validate?

Skills that share tags, products or a category with Validate: Dynamic Workflow Mode (affaan-m/ECC, 274k stars), Agent GitHub Modes (ruvnet/ruflo, 74k stars), Consent Mode (thedaviddias/Front-End-Checklist, 74k stars) and Studio Mode (remotion-dev/remotion, 62k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Validate?

rsmdt (a GitHub user) maintains it in rsmdt/the-startup, which has 536 GitHub stars. The repository holds 27 skills in this directory. The repository was last updated on August 3, 2026.

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