Add a get_heapsnapshot_object_details MCP tool which lets the agent
query all known information about a node in the heap snapshot.
Co-authored-by: Dominik Inführ <dinfuehr@chromium.org>
Emits native contexts and their sizes with the get_heapsnapshot_summary
MCP tool. This should help the agent get an overview about which native
contexts consume the most memory.
Co-authored-by: Dominik Inführ <dinfuehr@chromium.org>
This exposes DevTools named filters in get_heapsnapshot_details and
get_heapsnapshot_class_nodes tools. This allows the client to list e.g.
all objects retained through detached DOM objects.
Co-authored-by: Dominik Inführ <dinfuehr@chromium.org>
Instead of two separate MCP tools, we can have one instead which takes
classIndex as optional argument.
Co-authored-by: Dominik Inführ <dinfuehr@chromium.org>
This commit adds two MCP tools for comparing heap snapshots.
`compare_heapsnapshot_summary` compares two memory snapshot and returns
which classes have new/deleted objects.
`compare_heapsnapshot_class_nodes` can then be used to list the object
ids added and deleted for a specific class.
Co-authored-by: Dominik Inführ <dinfuehr@chromium.org>
Adding the get_heapsnapshot_dominators MCP tool to show the dominators
for a given node. In combination with get_heapsnapshot_retaining_paths
this should help understand what keeps an object reachable and thus
alive.
Co-authored-by: Dominik Inführ <dinfuehr@chromium.org>
Co-authored-by: Nicholas Roscino <nroscino@google.com>
This PR adds the get_heapsnapshot_edges MCP tool. Agents can use it to
look at the outgoing edges for a specifc object.
Co-authored-by: Dominik Inführ <dinfuehr@chromium.org>
This PR adds the `get_heapsnapshot_retaining_paths` MCP tool. This can
be used to find the paths from the target object to the GC roots which
keep that object alive.
Co-authored-by: Dominik Inführ <dinfuehr@chromium.org>
Update the tools to all include the `heapsnapshot` term for easier
handling.
Renames UID to ID to reduce confusion with the snapshot UIDs.
Renames Id to NodeId to better differentiate from the base Id.
Remove EdgeIndex as it was not useful.
Closes:
https://github.com/ChromeDevTools/chrome-devtools-mcp/issues/1970
This is a better measurement as if object self size is X and the
retainerSize Y. X will always be smaller then Y, there Y will be the
actual size on the Heap.
This refactors the code to extract the Id logic from the PageCollector
and provide it in the heapsnapshot.
We need to use an UID as we need the internal ClassKey to query the
heapsnapshot, but that is a strange string (usually looking like
`,ClassName`) which may get the LLM confused as we use comma separated
output.
Dominik Inführ