Precise Special Functions — Privacy Policy

Effective: 2026-07-05 Contact: Assaf Lanir · lanir.assaf@gmail.com

What this app does

Precise Special Functions is a specialized mathematical calculator for high-precision special-function evaluations. When ChatGPT invokes one of the app's tools, the tool receives numeric arguments (integers, real numbers, and an optional precision parameter), computes the result using arbitrary-precision arithmetic, and returns the result as a decimal string.

What we collect

For each tool invocation, the app logs:

• Tool name (e.g., bessel_j, riemann_zeta, gamma).
• Numeric arguments passed to the tool (e.g., n=0, x=2.4048, precision_dps=50).
• Timestamp of the invocation.
• Computed result (a decimal string).
• Invocation latency.

What we DO NOT collect

• User identity, name, email, or account information.
• Chat context, conversation history, or messages beyond the specific tool call arguments.
• IP addresses beyond ephemeral transport-layer information that Fly.io (our hosting provider) and OpenAI (the ChatGPT connector protocol) may handle in the ordinary course of routing requests.
• Any personally identifying information (PII).

Why we collect it

Invocation logs support internal analytics that reconcile ChatGPT-observed tool calls against the server's own record. This work is part of a broader research project studying how AI assistants route tool invocations across published apps. The reference app is an instrument for that research, not a general-purpose consumer product.

How long we retain it

90 days from the invocation timestamp, after which logs are deleted from active storage. Backups are subject to Fly.io's standard retention policy.

Third parties

We do not sell, rent, or share invocation logs with third parties.

Infrastructure providers involved in ordinary operation:

• Fly.io — hosts the app's MCP server. Fly.io's privacy policy applies to infrastructure-level data (routing, request logs).
• OpenAI — operates the ChatGPT connector protocol through which invocations arrive. OpenAI's privacy policy applies to the user-facing chat and its own logging.

User rights

Because we do not collect user identity, we cannot associate invocation logs with a specific user, so there is no per-user deletion mechanism available at the log level. If you have concerns about a specific interaction with the app, contact the address above.

Changes to this policy

Material changes will be published to the same URL as this policy with an updated "Effective" date.

Contact

Questions, corrections, or complaints: lanir.assaf@gmail.com