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Make workspace selection discoverable to MCP clients #17

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15 changes: 15 additions & 0 deletions cmd/server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,11 +22,26 @@ import (
"github.com/render-oss/render-mcp-server/pkg/session"
)

const serverInstructions = `This server manages resources on Render (https://render.com).

Workspace selection is required before most actions. Tools that operate on services, ` +
"deploys, postgres databases, key-value stores, logs, or metrics need a workspace to be " +
"selected for the current session.\n\n" +
`Workspace flow:
1. If unsure whether a workspace is selected, call ` + "`get_selected_workspace`" + `.
2. If none is selected (or a tool returns a "no workspace selected" error), call ` +
"`list_workspaces`" + ` to see available workspaces.
3. Ask the user which workspace to use. NEVER pick one yourself — selecting the wrong ` +
`workspace can cause destructive actions on unintended resources.
4. Once the user confirms, call ` + "`select_workspace`" + ` with the matching ownerID, then ` +
`retry the original tool call.`

func Serve(transport string) *server.MCPServer {
// Create MCP server
s := server.NewMCPServer(
"render-mcp-server",
cfg.Version,
server.WithInstructions(serverInstructions),
)

c, err := client.NewDefaultClient()
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7 changes: 6 additions & 1 deletion pkg/config/config.go
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Expand Up @@ -18,7 +18,12 @@ var defaultConfigPath string
const configPathEnvKey = "RENDER_CONFIG_PATH"
const workspaceEnvKey = "RENDER_WORKSPACE"

var ErrNoWorkspace = errors.New("no workspace set. Prompt the user to select a workspace. Do NOT try to select a workspace for them, as it may be destructive")
var ErrNoWorkspace = errors.New("no workspace selected. To resolve: " +
"(1) call the `list_workspaces` tool to see the workspaces this account has access to, " +
"(2) ask the user which workspace to use — do NOT pick one yourself, since acting on the " +
"wrong workspace can cause destructive changes to unintended resources, " +
"(3) once the user confirms, call the `select_workspace` tool with the matching `ownerID`, " +
"then retry the original tool call")
var ErrLogin = errors.New("not authenticated; either set RENDER_API_KEY or ask your MCP host to authenticate")

type Config struct {
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