Identify Assumptions Existing
phuryn/pm-skills
Identify risky assumptions for a feature idea in an existing product across Value, Usability, Viability, and Feasibility.
Challenge a proposed solution by identifying and testing consequential assumptions.
MITAuto-check passed
Install Test Assumptions
$ npx skills add suboss87/FDEOps --skill test-assumptions -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install suboss87/FDEOps test-assumptions --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/suboss87/FDEOps.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/test-assumptions .claude/skills/test-assumptions && rm -rf skills-srcUse ~/.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/
Install the "test-assumptions" agent skill from https://github.com/suboss87/FDEOps/tree/Main/skills/test-assumptions into .claude/skills/test-assumptions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-assumptions", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/suboss87/FDEOps/tree/Main/skills/test-assumptionsType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add suboss87/FDEOps --skill test-assumptions -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install suboss87/FDEOps test-assumptions --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/suboss87/FDEOps.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/test-assumptions .agents/skills/test-assumptions && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "test-assumptions" agent skill from https://github.com/suboss87/FDEOps/tree/Main/skills/test-assumptions into .agents/skills/test-assumptions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-assumptions", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add suboss87/FDEOps --skill test-assumptions -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install suboss87/FDEOps test-assumptions --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/suboss87/FDEOps.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/test-assumptions .cursor/skills/test-assumptions && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "test-assumptions" agent skill from https://github.com/suboss87/FDEOps/tree/Main/skills/test-assumptions into .cursor/skills/test-assumptions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-assumptions", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/suboss87/FDEOps.git --path skills/test-assumptions--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add suboss87/FDEOps --skill test-assumptions -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install suboss87/FDEOps test-assumptions --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/suboss87/FDEOps.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/test-assumptions .gemini/skills/test-assumptions && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "test-assumptions" agent skill from https://github.com/suboss87/FDEOps/tree/Main/skills/test-assumptions into .gemini/skills/test-assumptions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-assumptions", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install suboss87/FDEOps test-assumptionsInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add suboss87/FDEOps --skill test-assumptions -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/suboss87/FDEOps.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/test-assumptions .github/skills/test-assumptions && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "test-assumptions" agent skill from https://github.com/suboss87/FDEOps/tree/Main/skills/test-assumptions into .github/skills/test-assumptions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-assumptions", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add suboss87/FDEOps --skill test-assumptions -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install suboss87/FDEOps test-assumptions --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/suboss87/FDEOps.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/test-assumptions .opencode/skills/test-assumptions && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "test-assumptions" agent skill from https://github.com/suboss87/FDEOps/tree/Main/skills/test-assumptions into .opencode/skills/test-assumptions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "test-assumptions", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
test-assumptions- GitHub stars
- 954
- Token cost
- ~346 tokens
- SKILL.md length
- 145 words
- Files
- 5 (incl. references)
- Skills in repo
- 34
- Repo updated
- First seen
- Licence
- MIT
At a glance
Challenge a proposed solution by identifying and testing consequential assumptions.
- Works in 2 steps: Read the task context contract. → Read the method.
- The brief feels too certain
- SKILL.md covers Purpose and Principles
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Test Assumptions is an agent skill from suboss87/FDEOps. Challenge a proposed solution by identifying and testing consequential assumptions. Use when the brief feels too certain or discovery reveals contradictions.
Its SKILL.md is about 350 tokens, which your agent loads only when the skill is triggered. The skill folder holds 6 other files, including reference files (for example `.fde-generated.json`, `agents/openai.yaml` and `references/task-context.md`).
The repository describes itself as: Forward deployed engineering skills for AI coding agents. The licence is MIT.
When your agent uses it
- The brief feels too certain
- Discovery reveals contradictions
Example prompts
- “/test-assumptions”
Workflow steps
2 steps, taken from the first numbered list in SKILL.md.
- Read the task context contract.
- Read the method.
What it can do on your machine
Read from SKILL.md and the folder at commit 64d1d8a. 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
Test Assumptions loads about 346 tokens when it runs, and up to ~4k if it reads all its reference files. Until then it costs about 44 tokens; SKILL.md has 145 words of instructions outside code blocks.
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 suboss87/FDEOps at commit 64d1d8a, republished under its MIT licence (© suboss87). 145 words, ~346 tokens.
Download SKILL.mdSave it as
.claude/skills/test-assumptions/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.- name
- test-assumptions
- description
- Challenge a proposed solution by identifying and testing consequential assumptions. Use when the brief feels too certain or discovery reveals contradictions.
test-assumptions
<!-- Generated by bin/generate-skills.js; edit the canonical references and catalog. -->Purpose
A ranked set of assumptions and ways to test them.
Before investigating or acting:
- Read the task context contract.
- Read the method.
Load further references only when the task needs them. Everything linked is included in this skill; no other skill pack is required.
Principles
- Work directly from the supplied permitted context. Standalone work does not require an engagement folder or initialization. Record filenames in the method are optional persistence destinations when no engagement is bound.
- If called by @fde, reuse its current sanitized packet and scope. Do not restart setup, discovery or questions already answered.
- The task context contract controls persistence and authority in both modes. Preserve unknowns and distinguish implementation, verification, deployment and acceptance.
- Use the customer's repository instructions and available tools. Report a missing capability or unrun check honestly; do not claim that installing a skill provisions infrastructure.
© suboss87, 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 4 other files (references) in skills/test-assumptions of suboss87/FDEOps.
- SKILL.md
- .fde-generated.json
- agents/openai.yaml
- references/task-context.md
- references/test-assumptions.md
Open the folder on GitHubat commit 64d1d8a
Compare with similar skills
Test Assumptions 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Test Assumptions this skillsuboss87/FDEOps | 954 | — | ~346 | Automated safety check: Pass | MIT | |
| Identify Assumptions Existingphuryn/pm-skills | 27k | — | ~525 | Automated safety check: Pass | MIT | |
| Identify Assumptions Newphuryn/pm-skills | 27k | — | ~807 | Automated safety check: Pass | MIT | |
| Identify Assumptionsborghei/Claude-Skills | 881 | — | ~1.4k | Automated safety check: Pass | MIT | |
| Geo Proposalsickn33/agentic-awesome-skills | 47k | 1 repos | ~3.2k | Automated safety check: Notes | MIT | |
| Better Proposals AutomationComposioHQ/awesome-claude-skills | 77k | 3 repos | ~764 | Automated safety check: Pass | None |
Similar skills
Identify Assumptions New
phuryn/pm-skills
Identify risky assumptions for a new product idea across 8 risk categories including Go-to-Market, Strategy, and Team.
Identify Assumptions
borghei/Claude-Skills
Assumption mapping expert that identifies, categorizes, and prioritizes product assumptions across 4-8 risk categories using devil's advocate analysis.
Geo Proposal
sickn33/agentic-awesome-skills
Auto-generate a professional, client-ready GEO service proposal from audit data.
Better Proposals Automation
ComposioHQ/awesome-claude-skills
Automate Better Proposals tasks via Rube MCP (Composio). An agent skill from ComposioHQ/awesome-claude-skills.
Assumption Challenger
alirezarezvani/claude-cto-team
Identify and challenge implicit assumptions in plans, proposals, and technical decisions.
More from suboss87/FDEOps
All 34 skills in this repoFde
suboss87/FDEOps
Keeps the engagement record for client work. An agent skill from suboss87/FDEOps.
Audit
suboss87/FDEOps
Audit an inherited engagement or implementation against its evidence.
Board Memo
suboss87/FDEOps
Draft a board or executive summary of an engagement using outcomes, risks and investment decisions.
Brief
suboss87/FDEOps
Clarify a new customer brief, desired outcome, constraints and evidence gaps.
Business Case
suboss87/FDEOps
Develop a business case for an initiative using costs, benefits, risks and evidence.
Connect
suboss87/FDEOps
Configure or diagnose access to a requested source using available host tools.
Questions about Test Assumptions
What does Test Assumptions do?
Challenge a proposed solution by identifying and testing consequential assumptions. Test Assumptions is an agent skill from suboss87/FDEOps. Challenge a proposed solution by identifying and testing consequential assumptions.
When should I use Test Assumptions?
Test Assumptions fits situations like: the brief feels too certain; discovery reveals contradictions.
How do I install Test Assumptions in Claude Code?
Run `npx skills add suboss87/FDEOps --skill test-assumptions -a claude-code`. Or copy the skill folder (skills/test-assumptions in suboss87/FDEOps) into .claude/skills/test-assumptions in your project. Claude Code loads it when a task matches its description.
How do I install Test Assumptions in Codex?
Run `npx skills add suboss87/FDEOps --skill test-assumptions -a codex`. Or copy the skill folder (skills/test-assumptions in suboss87/FDEOps) into .agents/skills/test-assumptions in your project. Codex loads it when a task matches its description.
Can I use Test Assumptions 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 suboss87/FDEOps --skill test-assumptions -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/test-assumptions, .gemini/skills/test-assumptions, .github/skills/test-assumptions and .opencode/skills/test-assumptions in your project.
What does Test Assumptions need to run?
SKILL.md names no scripts, command-line tools or credentials: Test Assumptions is instructions for the agent only.
Does Test Assumptions 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 Test Assumptions 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 Test Assumptions use?
Test Assumptions 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 Test Assumptions use?
About 346 tokens (SKILL.md is roughly 1.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 3.7k tokens, read only when the agent opens those files.
What are the alternatives to Test Assumptions?
Skills that share tags, products or a category with Test Assumptions: Identify Assumptions Existing (phuryn/pm-skills, 27k stars), Identify Assumptions New (phuryn/pm-skills, 27k stars), Identify Assumptions (borghei/Claude-Skills, 881 stars) and Geo Proposal (sickn33/agentic-awesome-skills, 47k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Test Assumptions?
suboss87 (a GitHub user) maintains it in suboss87/FDEOps, which has 954 GitHub stars. The repository holds 34 skills in this directory. The repository was last updated on October 8, 2026.
Source: suboss87/FDEOps on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.