Access

anvil

Token

anvil

Sessions

offline

Session

No session

idle

Model

Mode

Gate

Tokens —

Revisions

Instruction

Schedule of parts

Tool servers

MCP servers extend the agent's tool set. Tools appear under the server's name, so fs offering read_text_file becomes fs_read_text_file.

Add a server

Name

Local process Remote URL

Command Arguments — one per line Environment — KEY=value, one per line

URL Bearer token

${VAR} names an environment variable rather than storing the secret. The file is written with mode 600 either way, but a literal token in a file that may be committed is a leak waiting to happen.

Connecting or removing a server changes the tool list, which sits at the very front of the prompt. Every session re-establishes its cached prefix at full price on its next request.

Specification

Model

Provider

Other model id

Switching mid-session discards the prompt cache. The next request re-establishes the prefix at full price.