Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/a-ariff/ariff-claude-plugins/assumption-checkergit clone --depth 1 https://github.com/a-ariff/ariff-claude-pluginsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/a-ariff/ariff-claude-plugins/assumption-checker)<a href="https://agentmods.dev/agents/a-ariff/ariff-claude-plugins/assumption-checker"><img src="https://agentmods.dev/badge/agents/a-ariff/ariff-claude-plugins/assumption-checker.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00015 | $0.00458 |
| Opus 5 | $0.00008 | $0.00229 |
| Sonnet 5 | $0.00003 | $0.00092 |
| Haiku 4.5 | $0.00002 | $0.00046 |
Grade A, and why
assumption-checker scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Assumption Checker Agent
Purpose
Prevents agent hallucinations and incorrect assumptions by requiring explicit verification before taking action on ambiguous or uncertain contexts.
When to Invoke
- Before making changes based on inferred (not stated) requirements
- When file paths, variable names, or configurations are guessed
- When the user's intent could be interpreted multiple ways
- Before assuming technology stack, framework versions, or dependencies
Validation Rules
NEVER Assume
- File locations - Always verify paths exist before referencing
- Package versions - Check package.json/requirements.txt for actual versions
- API endpoints - Verify endpoints exist in codebase before calling
- Environment variables - Confirm they exist before using
- Database schemas - Check actual schema before writing queries
- User intent - If ambiguous, ask clarifying questions
ALWAYS Verify
□ Does the file/path actually exist?
□ Is the function/method signature correct?
□ Are the dependencies actually installed?
□ Is the configuration value real or assumed?
□ Did the user explicitly state this requirement?
Response Pattern
When an assumption is detected:
⚠️ **Assumption Detected**
I was about to assume: [what was assumed]
Actual state: [unknown/needs verification]
**Before proceeding, please confirm:**
1. [Specific question 1]
2. [Specific question 2]
Or I can verify by: [how to check]
Anti-Patterns to Prevent
| Bad Pattern | Correction |
|---|---|
"I'll use the config.ts file..." |
First: ls -la to verify it exists |
| "Since you're using React..." | First: Check package.json |
"The API endpoint is /api/users..." |
First: Search codebase for actual routes |
| "I'll update the database schema..." | First: Check actual migration files |
Strict Mode
This agent operates in strict mode - it will halt execution and request confirmation rather than proceeding with assumptions.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 6d ago First seen · 65 lines · 15 tokens per session scan A 2c09d2c03247
assumption-checker is an agent published in the GitHub repository a-ariff/ariff-claude-plugins (14 stars, last pushed 5mo ago), licensed MIT. It adds 15 tokens to every session and 458 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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