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feat(coding-agent): stop waiting for MCP servers on the first prompt

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The first prompt waits only for servers with direct tools. Other servers
connect in the background; codemode scripts, tool_search, and the
resource tools wait for the servers they need. codemode and tool_search
are activated from the config.

Tool declarations no longer depend on connected servers: the codemode
description leaves out deferred tools, and the tool_search description
no longer lists sources. Servers are listed in an mcp_servers system
prompt section instead, set in before_agent_start from the config and
connected state, so changes are appended to the conversation.

describeNamespace() and searchTools() accept mcp__dev-radius,
mcp__dev_radius, dev-radius, and dev_radius.

closes #10212
This commit is contained in:
Armin Ronacher 2026-09-30 17:20:47 +02:00
parent 2bbfcca437
commit e029c3ed0a
13 changed files with 550 additions and 172 deletions
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2
packages/coding-agent/docs/cli.md
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@ -171,7 +171,7 @@ A script may start with an options line such as `// @options: {"max_output_token
While `codemode` is active, `codemode.mode` in [settings](settings.md#tools) decides how the other tools are presented. With `on` (default) declared tools keep being declared and their descriptions show how to call them from scripts. With `only` they are hidden from the model and listed in the `codemode` description instead, so the model calls them through scripts.
The `codemode` description lists the callable tools with their TypeScript declarations, grouped by namespace (for example one MCP server). Tools with `deferred` exposure, which includes MCP tools with the default `codemode` exposure, are not listed; their namespace is listed with its description. Declarations share a budget of 3000 estimated tokens (`codemode.inlineBudget` in [settings](settings.md#tools)), and the description says whether the list is complete. Scripts find the rest with `await searchTools(query, { limit, namespace })`, which ranks tools with BM25, and `await describeTool(name)`, or by filtering `ALL_TOOLS`. `await describeNamespace(name)` returns a namespace's description, its instructions (for MCP servers, the server instructions), and the names of its tools.
The `codemode` description lists the callable tools with their TypeScript declarations, grouped by namespace (for example one MCP server). Tools with `deferred` exposure, which includes MCP tools with the default `codemode` exposure, are not listed and do not affect the description, so it stays the same while MCP servers connect. Declarations share a budget of 3000 estimated tokens (`codemode.inlineBudget` in [settings](settings.md#tools)). Scripts find the rest with `await searchTools(query, { limit, namespace })`, which ranks tools with BM25, and `await describeTool(name)`, or by filtering `ALL_TOOLS`. `await describeNamespace(name)` returns a namespace's description, its instructions (for MCP servers, the server instructions), and the names of its tools.
Tools with an output schema resolve to structured values: `bash` to `{ output, truncated, full_output_path?, exit_code, wall_time_seconds }`, also for non-zero exit codes, and MCP tools to their `CallToolResult`. Other tools resolve to their text output. The `output` of `bash` is not limited to the 2000 lines or 50KB the model sees: it holds up to 1 MiB, and longer output keeps its first and last 512 KiB around an omission marker, with `truncated` set and the full output in `full_output_path`.