MCP (Model Context Protocol) is the agent-facing API for tool-calling between LLM clients and servers. Wikilayer speaks the standard MCP wire format, so any client connects without a bespoke SDK. The tree's read and write operations are exposed as MCP tools.
Standard
Wikilayer follows the MCP wire format without proprietary extensions. Clients discover tools via tools/list and call them with tools/call. Cloud installs require OAuth 2.1 + PKCE for client registration; self-hosted single-user installs skip auth entirely and treat every request as the bootstrapped user. The endpoint is <host>/mcp (https://wikilayer.org/mcp on the cloud).
Tools
Tools split into three groups; full input/output schemas arrive in the client's tools/list response.
Reading
get_outline: tree skeleton of a wiki, page, or block subtree.get_node: one node's title + body.get_node_history: change log for a node.list_wikis: wikis the caller can read.search_nodes: full-text search inside one wiki.search_public_wikis: full-text search across every public wiki on the instance.
Writing
create_wiki: new wiki rooted under the caller's owner.update_wiki: wiki-level fields (title, visibility, primary language).create_nodes: batch-create pages and blocks under a parent.update_node: replace a node's title and body.patch_node: ordered literal-string replacements on a body.move_node: reparent a node and its subtree.delete_nodes: remove nodes with their subtrees (history preserved).
Other
request_upload: signed URL for uploading an image to attach into a markdown body. Only on deploys with object storage configured.set_page_seo: hand-authored OG / Twitter overrides for a public page.