Rust MCP Filesystem

use std::path::Path; use rust_mcp_sdk::macros::{JsonSchema, mcp_tool}; use rust_mcp_sdk::schema::TextContent; use rust_mcp_sdk::schema::{CallToolResult, schema_utils::CallToolError}; use crate::fs_service::FileSystemService; #[derive(::serde::Deserialize, ::serde::Serialize, Clone, Debug, JsonSchema)] /// Represents a text replacement operation. pub struct EditOperation { /// Text to search for - must match exactly. #[serde(rename = "oldText")] pub old_text: String, #[serde(rename = "newText")] /// Text to replace the matched text with. pub new_text: String, } #[mcp_tool( name = "edit_file", title="Edit file", description = concat!("Make line-based edits to a text file. ", "Each edit replaces exact line sequences with new content. ", "Returns a git-style diff showing the changes made. ", "Only works within allowed directories."), destructive_hint = false, idempotent_hint = false, open_world_hint = false, read_only_hint = false )] #[derive(::serde::Deserialize, ::serde::Serialize, Clone, Debug, JsonSchema)] pub struct EditFile { /// The path of the file to edit. pub path: String, /// The list of edit operations to apply. pub edits: Vec<EditOperation>, /// Preview changes using git-style diff format without applying them. #[serde( rename = "dryRun", default, skip_serializing_if = "std::option::Option::is_none" )] pub dry_run: Option<bool>, } impl EditFile { pub async fn run_tool( params: Self, context: &FileSystemService, ) -> std::result::Result<CallToolResult, CallToolError> { let diff = context .apply_file_edits(Path::new(&params.path), params.edits, params.dry_run, None) .await .map_err(CallToolError::new)?; Ok(CallToolResult::text_content(vec![TextContent::from(diff)])) } }