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fix(tools): report the ListMcpResources cap in resources, not bytes

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`gate_mcp_resources` caps the list at `MCP_RESOURCE_LIMIT` (200 resources),
then describes that truncation with `truncation_notice`, which is written
for byte budgets and was handed `MCP_TEXT_LIMIT`. A server returning 250
resources produced:

    [truncated: ListMcpResources result exceeded 32768 bytes; showing 200 of 250 bytes]

Neither figure describes what happened: 32768 is a text budget this path
never applies, and the counts are resources rather than bytes. The notice
goes into a sentinel resource's description, so it is what the model reads
to learn why the list is short -- and it invites the conclusion that the
list was cut for size and would fit under a smaller byte budget.

State the cap that was actually applied, in its own unit, matching the
wording the sibling item-count truncation in `gate_mcp` already uses.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
kevin9327
2026-09-04 20:12:02 +09:00
co-authored by Claude Opus 5
parent 37f9c4c4c8
commit c3951a448c
1 changed files with 38 additions and 5 deletions
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server/src/cursor/tools/tool_call_result/gate.rs
+38 -5
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@@ -517,11 +517,9 @@ fn gate_mcp_resources(tool: &mut pb::ListMcpResourcesToolCall) {
.push(pb::list_mcp_resources_exec_result::McpResource {
uri: "truncated:list-mcp-resources".into(),
name: Some("truncated".into()),
description: Some(truncation_notice(
"ListMcpResources",
MCP_TEXT_LIMIT,
success.resources.len(),
original,
description: Some(format!(
"[truncated: ListMcpResources result exceeded {MCP_RESOURCE_LIMIT} resources; showing {} of {original} resources]",
success.resources.len()
)),
..Default::default()
});
@@ -861,4 +859,39 @@ mod tests {
let mut content = String::new();
tool_completion("Grep", &mut tool, &mut content);
}
#[test]
fn list_mcp_resources_reports_the_cap_it_actually_applied() {
let resources = (0..MCP_RESOURCE_LIMIT + 50)
.map(|index| pb::list_mcp_resources_exec_result::McpResource {
uri: format!("mcp://resource/{index}"),
..Default::default()
})
.collect();
let mut tool = pb::ListMcpResourcesToolCall {
args: None,
result: Some(pb::ListMcpResourcesExecResult {
result: Some(pb::list_mcp_resources_exec_result::Result::Success(
pb::ListMcpResourcesSuccess { resources },
)),
}),
};
gate_mcp_resources(&mut tool);
let pb::list_mcp_resources_exec_result::Result::Success(success) =
tool.result.unwrap().result.unwrap()
else {
panic!("expected a successful result");
};
let notice = success.resources.last().unwrap();
assert_eq!(notice.uri, "truncated:list-mcp-resources");
assert_eq!(
notice.description.as_deref(),
Some(
"[truncated: ListMcpResources result exceeded 200 resources; \
showing 200 of 250 resources]"
)
);
}
}