zeph_tools/
tool_filter.rs

1// SPDX-FileCopyrightText: 2026 Andrei G <bug-ops>
2// SPDX-License-Identifier: MIT OR Apache-2.0
3
4use crate::executor::{ToolCall, ToolError, ToolExecutor, ToolOutput};
5use crate::registry::ToolDef;
6
7/// Wraps a `ToolExecutor` and suppresses specified tool ids from both
8/// `tool_definitions` and `execute_tool_call`.
9///
10/// Used to hide `FileExecutor` tools (e.g. `read`, `glob`) when
11/// `AcpFileExecutor` provides equivalent IDE-proxied alternatives.
12#[derive(Debug)]
13pub struct ToolFilter<E: ToolExecutor> {
14    inner: E,
15    suppressed: &'static [&'static str],
16}
17
18impl<E: ToolExecutor> ToolFilter<E> {
19    #[must_use]
20    pub fn new(inner: E, suppressed: &'static [&'static str]) -> Self {
21        Self { inner, suppressed }
22    }
23}
24
25impl<E: ToolExecutor> ToolExecutor for ToolFilter<E> {
26    async fn execute(&self, response: &str) -> Result<Option<ToolOutput>, ToolError> {
27        self.inner.execute(response).await
28    }
29
30    async fn execute_confirmed(&self, response: &str) -> Result<Option<ToolOutput>, ToolError> {
31        self.inner.execute_confirmed(response).await
32    }
33
34    fn tool_definitions(&self) -> Vec<ToolDef> {
35        self.inner
36            .tool_definitions()
37            .into_iter()
38            .filter(|d| !self.suppressed.contains(&d.id.as_ref()))
39            .collect()
40    }
41
42    async fn execute_tool_call(&self, call: &ToolCall) -> Result<Option<ToolOutput>, ToolError> {
43        if self.suppressed.contains(&call.tool_id.as_str()) {
44            return Ok(None);
45        }
46        self.inner.execute_tool_call(call).await
47    }
48}
49
50#[cfg(test)]
51mod tests {
52    use super::*;
53
54    #[derive(Debug)]
55    struct StubExecutor;
56    impl ToolExecutor for StubExecutor {
57        async fn execute(&self, _: &str) -> Result<Option<ToolOutput>, ToolError> {
58            Ok(None)
59        }
60        fn tool_definitions(&self) -> Vec<ToolDef> {
61            vec![
62                ToolDef {
63                    id: "read".into(),
64                    description: "read a file".into(),
65                    schema: schemars::schema_for!(String),
66                    invocation: crate::registry::InvocationHint::ToolCall,
67                },
68                ToolDef {
69                    id: "glob".into(),
70                    description: "find files".into(),
71                    schema: schemars::schema_for!(String),
72                    invocation: crate::registry::InvocationHint::ToolCall,
73                },
74                ToolDef {
75                    id: "edit".into(),
76                    description: "edit a file".into(),
77                    schema: schemars::schema_for!(String),
78                    invocation: crate::registry::InvocationHint::ToolCall,
79                },
80            ]
81        }
82        async fn execute_tool_call(
83            &self,
84            call: &ToolCall,
85        ) -> Result<Option<ToolOutput>, ToolError> {
86            Ok(Some(ToolOutput {
87                tool_name: call.tool_id.clone(),
88                summary: "stub".to_owned(),
89                blocks_executed: 1,
90                filter_stats: None,
91                diff: None,
92                streamed: false,
93                terminal_id: None,
94                locations: None,
95                raw_response: None,
96            }))
97        }
98    }
99
100    #[test]
101    fn suppressed_tools_hidden_from_definitions() {
102        let filter = ToolFilter::new(StubExecutor, &["read", "glob"]);
103        let defs = filter.tool_definitions();
104        let ids: Vec<&str> = defs.iter().map(|d| d.id.as_ref()).collect();
105        assert!(!ids.contains(&"read"));
106        assert!(!ids.contains(&"glob"));
107        assert!(ids.contains(&"edit"));
108    }
109
110    #[tokio::test]
111    async fn suppressed_tool_call_returns_none() {
112        let filter = ToolFilter::new(StubExecutor, &["read", "glob"]);
113        let call = ToolCall {
114            tool_id: "read".to_owned(),
115            params: serde_json::Map::new(),
116        };
117        let result = filter.execute_tool_call(&call).await.unwrap();
118        assert!(result.is_none());
119    }
120
121    #[tokio::test]
122    async fn allowed_tool_call_passes_through() {
123        let filter = ToolFilter::new(StubExecutor, &["read", "glob"]);
124        let call = ToolCall {
125            tool_id: "edit".to_owned(),
126            params: serde_json::Map::new(),
127        };
128        let result = filter.execute_tool_call(&call).await.unwrap();
129        assert!(result.is_some());
130    }
131}
zeph_tools/tool_filter.rs

zeph_tools/
tool_filter.rs
