Function install_mcp_server

src/agents/opencode.rs:205–228

Register MCP server in opencode.json. Safety: creates a `.bak` backup before writing and restores it on any error. Uses strict JSON parsing so an existing file with invalid syntax is never silently replaced with an empty object.

(config_path: &Path, tracedecay_bin: &str)

/// error. Uses strict JSON parsing so an existing file with invalid syntax
/// is never silently replaced with an empty object.
fn install_mcp_server(config_path: &Path, tracedecay_bin: &str) -> Result<()> {
    let backup = backup_config_file(config_path)?;
    let mut config = match load_json_file_strict(config_path) {
        Ok(v) => v,
        Err(e) => {
            if let Some(ref b) = backup {
                eprintln!("  Backup preserved at: {}", b.display());
            }
            return Err(e);
        }
    };

    config["mcp"]["tracedecay"] = json!({
        "type": "local",
        "command": [tracedecay_bin, "serve"]
    });

    safe_write_json_file(config_path, &config, backup.as_deref())?;
    eprintln!(
        "\x1b[32m✔\x1b[0m Added tracedecay MCP server to {}",
        config_path.display()
    );
    Ok(())
}

/// Install-or-refresh prompt rules in AGENTS.md.
fn install_prompt_rules(prompt_path: &Path) -> Result<()> {