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feat(core): allow MCP Code Mode opt-out (#37681)

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Co-authored-by: Dax Raad <d@ironbay.co>
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opencode-agent[bot] 2026-07-18 17:17:56 -04:00 • committed by GitHub
commit fe9b051d1a
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6 changed files with 57 additions and 9 deletions
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6
packages/core/src/config/mcp.ts
View file

@ -23,6 +23,9 @@ export class Local extends Schema.Class<Local>("ConfigV2.MCP.Local")({
}),
environment: Schema.Record(Schema.String, Schema.String).pipe(Schema.optional),
disabled: Schema.Boolean.pipe(Schema.optional),
codemode: Schema.Boolean.pipe(Schema.optional).annotate({
description: "Expose this server's tools through Code Mode. Defaults to true.",
}),
timeout: Timeout.pipe(Schema.optional),
}) {}
@ -40,6 +43,9 @@ export class Remote extends Schema.Class<Remote>("ConfigV2.MCP.Remote")({
headers: Schema.Record(Schema.String, Schema.String).pipe(Schema.optional),
oauth: Schema.Union([OAuth, Schema.Literal(false)]).pipe(Schema.optional),
disabled: Schema.Boolean.pipe(Schema.optional),
codemode: Schema.Boolean.pipe(Schema.optional).annotate({
description: "Expose this server's tools through Code Mode. Defaults to true.",
}),
timeout: Timeout.pipe(Schema.optional),
}) {}

8
packages/core/src/mcp/index.ts
View file

@ -42,6 +42,7 @@ export class ServerInstructions extends Schema.Class<ServerInstructions>("MCP.Se
export class Tool extends Schema.Class<Tool>("MCP.Tool")({
server: ServerName,
name: Schema.String,
codemode: Schema.Boolean.pipe(Schema.optional),
description: Schema.String.pipe(Schema.optional),
inputSchema: Schema.Unknown.pipe(Schema.optional),
outputSchema: Schema.Unknown.pipe(Schema.optional),
@ -362,10 +363,11 @@ export const layer = Layer.effect(
}),
} satisfies MCPClient.ElicitationHandler
const toTool = (server: ServerName, def: MCPClient.ToolDefinition) =>
const toTool = (server: ServerName, entry: ServerEntry, def: MCPClient.ToolDefinition) =>
new Tool({
server,
name: def.name,
codemode: entry.config.codemode,
description: def.description,
inputSchema: def.inputSchema,
outputSchema: def.outputSchema,
@ -407,7 +409,7 @@ export const layer = Layer.effect(
const refreshTools = (name: ServerName, entry: ServerEntry, connection: MCPClient.Connection) =>
connection.tools().pipe(
Effect.map((defs) => {
entry.tools = defs.map((def) => toTool(name, def))
entry.tools = defs.map((def) => toTool(name, entry, def))
}),
)
@ -498,7 +500,7 @@ export const layer = Layer.effect(
)
if (Exit.isSuccess(result)) {
entry.client = result.value.connection
entry.tools = result.value.tools.map((def) => toTool(name, def))
entry.tools = result.value.tools.map((def) => toTool(name, entry, def))
entry.prompts = []
entry.status = { status: "connected" }
watch(name, entry, result.value.connection)

11
packages/core/src/tool/mcp.ts
View file

@ -16,8 +16,7 @@ import { ToolRegistry } from "./registry"
* Registry namespace and permission action names for MCP tools.
*/
export const namespace = (server: string) => server.replace(/[^a-zA-Z0-9_-]/g, "_")
export const name = (server: string, tool: string) =>
`${namespace(server)}_${tool.replace(/[^a-zA-Z0-9_-]/g, "_")}`
export const name = (server: string, tool: string) => `${namespace(server)}_${tool.replace(/[^a-zA-Z0-9_-]/g, "_")}`
export const layer = Layer.effectDiscard(
Effect.gen(function* () {
@ -33,11 +32,11 @@ export const layer = Layer.effectDiscard(
// registry never has a gap where MCP tools disappear mid-swap.
const reconcile = lock.withPermit(
Effect.gen(function* () {
const groups = new Map<string, Record<string, Tool.AnyTool>>()
const groups = new Map<string, { tools: Record<string, Tool.AnyTool>; codemode: boolean }>()
for (const tool of yield* mcp.tools()) {
const group = groups.get(tool.server) ?? {}
const group = groups.get(tool.server) ?? { tools: {}, codemode: tool.codemode !== false }
const schema = (tool.inputSchema ?? {}) as JsonSchema.JsonSchema
group[tool.name] = Tool.withPermission(
group.tools[tool.name] = Tool.withPermission(
Tool.make({
description: tool.description ?? "",
jsonSchema: {
@ -108,7 +107,7 @@ export const layer = Layer.effectDiscard(
const next = yield* Scope.fork(scope)
yield* Effect.forEach(
groups,
([server, record]) => tools.register(record, { namespace: namespace(server) }),
([server, group]) => tools.register(group.tools, { namespace: namespace(server), codemode: group.codemode }),
{
discard: true,
},