A GM agent for many TTRPGs.

You write what your character tries. Sylvia reads the campaign material, decides which mechanic applies, and calls the ruleset. The ruleset commits the result before Sylvia narrates it.

The model can interpret the attempt. It does not get to quietly replace the mechanical result.

A Campaign Plan gives Sylvia something to run before the first turn: acts, beats, private facts, and the conditions for revealing them. It is not a script. The plan can change when the player does something unexpected, while the history records what actually happened.

Running the campaign and making its material are different jobs. Builder helps create rulesets, settings, and Campaign Plans. Sylvia uses that material during play without turning the live GM conversation into an editing session.

A ruleset declares its mechanics, state, available actions, and player-facing panels. Sylvia does not assume that every game has D&D abilities, hit points, or combat turns.

The Alpha is being prepared with the open D&D SRD 5.2.1 and an explicit No Ruleset option. Trigger Discipline is the second full ruleset. Its tactical combat has already forced Sylvia to gain a grid, a raycaster, and a node map for hacking.

Sylvia can use a hosted OpenAI-compatible provider or connect to a local inference server that is already running. Provider presets are conveniences, not a fixed allowlist.

Campaign exports stay separate from provider credentials. Alpha will not download or manage a local model runtime for you.

The first release is being prepared for Windows 11. It will be free, open source, and distributed as one unsigned installer after the advertised journeys pass release qualification.

• Solo tabletop play with GM and Builder experiences
• SRD 5.2.1, No Ruleset, and Trigger Discipline content
• Local and user-chosen OpenAI-compatible providers
• Portable campaigns and owner-local credentials

Cloud hosting, multiplayer, mobile, and native macOS or Linux clients are not part of the Alpha promise.