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fix(coding-agent): keep MCP tools with --tools, add tool patterns and --no-mcp

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--tools no longer removes MCP tools unless an entry starts with mcp__, so
pi --tools codemode can reach MCP servers. Unnamed MCP tools are never
declared directly; only tool_search can load them. --no-tools still
removes everything.

--tools and --exclude-tools accept * patterns, for example
--tools read,codemode,'mcp__radius__*'. --no-mcp disables the built-in
MCP support for one run.
This commit is contained in:
Armin Ronacher 2026-10-05 17:21:25 +02:00
parent 147b502816
commit 04b97ef000
15 changed files with 309 additions and 51 deletions
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4
packages/coding-agent/docs/mcp.md
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@ -225,6 +225,8 @@ Pi activates `codemode` when a server with `codemode` exposure connects. It acti
Tools with `codemode` or `deferred` exposure can be reached through either indirect mechanism: codemode scripts can call them, and `tool_search` can load them. Codemode calls do not depend on the active tool set, so they remain available after `/tree`, resume, and fork. Tools loaded by `tool_search` are recorded in the transcript and remain declared on that branch.
`--tools` does not remove MCP tools unless one of its entries starts with `mcp__`; `pi --tools read,codemode,'mcp__radius__*'` keeps only the tools of `radius`. `--exclude-tools` accepts the same patterns, and `--no-mcp` disables MCP for one run (see [Tools](cli.md#mcp-tools)).
To keep `codemode` active without MCP servers, add `"defaultTools": ["+codemode"]` to [settings](settings.md#tools). To prevent automatic codemode activation, set `"autoEnableCodemode": false` beside `mcpServers`. A project value overrides the user-level value. Pi warns once when neither `codemode` nor `tool_search` is active and non-direct tools cannot be called.
Text results over 20 KB reach the model with their middle removed around a `…N chars truncated…` marker. The full text is saved to a temporary file named in the result. Codemode scripts receive the complete result and can reduce it before returning output to the model.
@ -261,7 +263,7 @@ Changes to enabled state or exposure apply only to the current session. A file-c
### Replace the built-in MCP support
An installed extension that registers `/mcp`, such as `pi-mcp-adapter`, replaces the built-in MCP support for sessions. Pi then does not read `mcp.json` or connect its servers in a session, and `/mcp` belongs to the extension. Remove the extension to restore the built-in behavior. To disable built-in MCP support without a replacement, disable `mcp` under Built-in in `pi config`, or set `"extensions": ["-builtin:mcp"]` in [settings](settings.md#resources).
An installed extension that registers `/mcp`, such as `pi-mcp-adapter`, replaces the built-in MCP support for sessions. Pi then does not read `mcp.json` or connect its servers in a session, and `/mcp` belongs to the extension. Remove the extension to restore the built-in behavior. To disable built-in MCP support without a replacement, disable `mcp` under Built-in in `pi config`, or set `"extensions": ["-builtin:mcp"]` in [settings](settings.md#resources). `--no-mcp` disables it for one run.
An extension that registers `codemode` or `tool_search` similarly replaces the built-in tool with that name. Shell-level `pi mcp` commands always use the built-in implementation.