feat(mcp): handle tools/list_changed notifications

[seuros]

Summary

• Subscribe to notifications/tools/list_changed from MCP servers
• Publish mcp.tools.list_changed event to the internal bus when received
• Enables consumers to react when servers dynamically modify their tool list

Context

MCP servers can dynamically add, remove, or modify tools at runtime. The official SDK provides ToolListChangedNotificationSchema for clients to subscribe to these changes, but opencode wasn't utilizing it.

Test plan

• Connect to an MCP server that supports dynamic tools (you can use cargo install dictator (the tool will swap the tools once initalized from 1 -> 3 )
• Verify notification handler is registered on connection
• Trigger a tool list change on the server
• Confirm mcp.tools.list_changed event is published to the bus

[rekram1-node]

/review

[rekram1-node]

okay cool, ty! I appreciate u looking into mcp support have a few other prs to merge in too so we can be more up to date w spec

[github-actions]

lgtm

[seuros]

Take your time!

The refresh is working now.

[rekram1-node]

ill take a look at this tonight, will test but at a glance it lgtm

[rekram1-node]

Okay so this publishes an event but what's the purpose? Just opencode sdk stuff? Or just tryign to make sure we both understand what this will do

[seuros]

The IDE (the client) listen to the notification and follow the spec.

If you install the mcp with cargo and mount it.

• You will have 1 tool, because your repo is not configured.
• The Tool is called, it get configured.
• Opencode receive notification , and it refresh it tools automatically.

Previously you had to stop the session and reset opencode respawrn the new tools.

I wrote a small Article, currently Charm and VScode support the spec. If this PR get merged opencode will too.

The MCP i shared is just a linter and you can install it from source.