Permission denied on write

AI tries to write Chapter 3/scene-1.scene → 400 INVALID_PATH. This article: diagnosis + fixes.

Slima Authorized Apps: write rejected (INVALID_PATH) usually involves Script Studio structured files

Read the error

The 400 INVALID_PATH message is explicit:

INVALID_PATH: Cannot write to /Chapter 3/scene-1.scene.
This is a structured file in a Script Studio book.
Writable paths: .script_studio/planning/**/*
Read-only paths: *.scene, *.character, *.storyline, *.note, *.location, season.json, episode.json, series.json

Why this path is read-only

Script Studio structured files are read-only over MCP — see Structured protections.

Two fixes

Path 1: write to planning, apply in Slima UI

Don't write .scene files — write proposals into .script_studio/planning/:

.script_studio/planning/scene-3-1-revision.md

Then in Slima Script Studio UI, open the scene and manually apply the AI's proposal.

Path 2: use the in-Slima AI Coach

The AI Coach inside the Slima editor (not MCP) can write structured files — because it goes through the app internally, not MCP.

Prevent: read the schema resource first

AI can read in advance:

slima://books/{book_token}/schema

Gets exact writable / readonly paths and avoids the dead-ends.

See: Schema resource

Hit it in a Writing Studio book?

Rare, but possible causes:

1 · Book in Trash

Soft-deleted books aren't writable. Fix: Restore from trash

2 · Shared to you read-only

(Sharing isn't in v1 — future feature)