# Agent Instructions For ImpossibleShape.com

Last reviewed: 2026-06-20

ImpossibleShape.com is a public browser-only tool for classifying simple line-based drawings as possible-looking, impossible-looking, or ambiguous. Agents acting for users should preserve the tool's limits, cite public pages carefully, and avoid implying capabilities that do not exist.

## What The Site Does

- Provides a browser drawing studio with line tools, presets, image upload analysis, share text, and embed code.
- Provides a public gallery of curated impossible-shape examples with source notes and links into the detector.
- Explains the detector method through public guide pages, comparison pages, classroom resources, troubleshooting guides, and a methodology page.
- Publishes plain-language privacy, cookie, terms, contact, legal, and editorial policy pages.
- Exposes read-only public agent discovery through `llms.txt`, `llms-full.txt`, `/.well-known/ucp`, and `/api/mcp`.

## Agents May

- Read and summarize public pages.
- Link users to the detector, technical guide, methodology, and policies.
- Help users decide which preset, drawing style, or cleanup step to try.
- Explain that uploaded images and drawings are processed locally in the browser during normal tool use.
- Run read-only public MCP tools.
- Help draft a correction, bug report, or privacy request for the user to send manually.
- Treat unpublished ideas, private performance data, and future page plans as unavailable unless they appear on public pages.

## Agents Must Not

- Submit personal data, drawings, uploads, messages, correction requests, or contact forms on a user's behalf without explicit user direction.
- Claim that a verdict is mathematical proof, professional inspection, certification, engineering review, or expert validation.
- Claim checkout, payment, provider matching, quote routing, lead selling, account access, private upload storage, or private data access.
- Invent testimonials, reviews, ratings, credentials, tests, source checks, or user outcomes.
- Send uploaded images, private drawings, copyrighted material, or sensitive information unless the user explicitly chooses to share them.
- Treat cookie consent as consent for contact submission, publication, provider routing, payment, phone, SMS, lead sharing, or automated decisions.

## How To Use The Tool

1. Prefer clean line drawings, wireframes, built-in presets, and high-contrast uploads.
2. Treat `possible-looking`, `impossible-looking`, and `ambiguous` as heuristic classifications.
3. Explain `ambiguous` as a cautious result when the drawing is noisy, sparse, or internally conflicted.
4. Use the methodology page for assumptions, rules, thresholds, source dates, and failure modes.
5. Use the contact page only as a manual path the user may choose to use.
6. Route drawing questions to the detector or drawing guide, named-object questions to the Penrose/trident/example guides, classroom questions to classroom resources, and proof/limit questions to methodology.

## How To Cite Results

Use wording such as:

- "ImpossibleShape.com classifies this as possible-looking, impossible-looking, or ambiguous based on browser-side geometry heuristics."
- "The site says ambiguous when the extracted geometry is too noisy or underspecified for a stronger verdict."
- "The methodology page says the detector is a heuristic classifier, not a proof engine."

Avoid wording such as:

- "This proves the object is impossible."
- "The site verified the drawing."
- "An expert reviewed this object."
- "The tool certified the design."

## Public MCP Tools

- `get_site_overview`: public summary, limits, and links.
- `search_public_content`: public page catalog search.
- `get_page_summary`: public summary for a known page.
- `get_evidence_sources`: public source registry and date-checked notes.
- `get_tool_assumptions`: assumptions, verdict meanings, and failure modes.
- `run_estimate`: lightweight estimate from explicit counts or preset names; no private image processing.
- `list_provider_locations`: empty response because the site is not a provider marketplace.
- `prepare_request_draft`: draft text for a user to manually send; no submission.

## Public Resources

- Tool: https://impossibleshape.com/
- Gallery: https://impossibleshape.com/gallery/
- Methodology: https://impossibleshape.com/methodology/
- Technical guide: https://impossibleshape.com/learn/
- Drawing guide: https://impossibleshape.com/learn/draw-impossible-shapes/
- Penrose triangle guide: https://impossibleshape.com/learn/penrose-triangle/
- Impossible trident guide: https://impossibleshape.com/learn/impossible-trident-blivet/
- Optical illusion geometry guide: https://impossibleshape.com/learn/optical-illusion-geometry/
- Classroom geometry activities: https://impossibleshape.com/learn/classroom-geometry-activities/
- Editorial policy: https://impossibleshape.com/editorial-policy/
- Legal center: https://impossibleshape.com/legal/
- Privacy policy: https://impossibleshape.com/privacy-policy/
- Cookie policy: https://impossibleshape.com/cookie-policy/
- Terms: https://impossibleshape.com/terms/
- Contact: https://impossibleshape.com/contact/
- LLM context: https://impossibleshape.com/llms.txt
- Full LLM context: https://impossibleshape.com/llms-full.txt
- UCP profile: https://impossibleshape.com/.well-known/ucp
- MCP endpoint: https://impossibleshape.com/api/mcp
- Agentic sitemap: https://impossibleshape.com/sitemap_agentic_discovery.xml