lean_ctx/tools/registered/
ctx_preload.rs1use rmcp::model::Tool;
2use rmcp::ErrorData;
3use serde_json::{json, Map, Value};
4
5use crate::server::tool_trait::{get_str, McpTool, ToolContext, ToolOutput};
6use crate::tool_defs::tool_def;
7
8pub struct CtxPreloadTool;
9
10impl McpTool for CtxPreloadTool {
11 fn name(&self) -> &'static str {
12 "ctx_preload"
13 }
14
15 fn tool_def(&self) -> Tool {
16 tool_def(
17 "ctx_preload",
18 "Proactive context loader — caches task-relevant files, returns L-curve-optimized summary (~50-100 tokens vs ~5000 for individual reads).",
19 json!({
20 "type": "object",
21 "properties": {
22 "task": {
23 "type": "string",
24 "description": "Task description (e.g. 'fix auth bug in validate_token')"
25 },
26 "path": {
27 "type": "string",
28 "description": "Project root (default: .)"
29 }
30 },
31 "required": ["task"]
32 }),
33 )
34 }
35
36 fn handle(
37 &self,
38 args: &Map<String, Value>,
39 ctx: &ToolContext,
40 ) -> Result<ToolOutput, ErrorData> {
41 let task = get_str(args, "task").unwrap_or_default();
42
43 let resolved_path = if get_str(args, "path").is_some() {
44 if let Some(p) = ctx.resolved_path("path") {
45 Some(p.to_string())
46 } else if let Some(err) = ctx.path_error("path") {
47 return Err(ErrorData::invalid_params(format!("path: {err}"), None));
48 } else {
49 None
50 }
51 } else if let Some(ref session) = ctx.session {
52 let guard = crate::server::bounded_lock::read(session, "ctx_preload:session_root");
53 guard.as_ref().and_then(|g| g.project_root.clone())
54 } else {
55 None
56 };
57
58 let cache = ctx.cache.as_ref().unwrap();
59 let Some(mut cache_guard) = crate::server::bounded_lock::write(cache, "ctx_preload:cache")
60 else {
61 return Ok(ToolOutput::simple(
62 "[preload skipped — cache temporarily unavailable]".to_string(),
63 ));
64 };
65 let mut result = crate::tools::ctx_preload::handle(
66 &mut cache_guard,
67 &task,
68 resolved_path.as_deref(),
69 ctx.crp_mode,
70 );
71
72 let provider_hints = predict_and_prefetch(&task, &mut cache_guard, &ctx.project_root);
73 if !provider_hints.is_empty() {
74 result.push_str(&provider_hints);
75 }
76
77 drop(cache_guard);
78
79 if let Some(ref session_lock) = ctx.session {
80 if let Some(mut session_guard) =
81 crate::server::bounded_lock::write(session_lock, "ctx_preload:session_write")
82 {
83 if session_guard.active_structured_intent.is_none()
84 || session_guard
85 .active_structured_intent
86 .as_ref()
87 .is_none_or(|i| i.confidence < 0.6)
88 {
89 session_guard.set_task(&task, Some("preload"));
90 }
91 }
92
93 if let Some(session_guard) =
94 crate::server::bounded_lock::read(session_lock, "ctx_preload:session_read")
95 {
96 if let Some(ref intent) = session_guard.active_structured_intent {
97 if let Some(ref ledger_lock) = ctx.ledger {
98 let Some(ledger) =
99 crate::server::bounded_lock::read(ledger_lock, "ctx_preload:ledger")
100 else {
101 return Ok(ToolOutput::simple(result));
102 };
103 if !ledger.entries.is_empty() {
104 let known: Vec<String> = session_guard
105 .files_touched
106 .iter()
107 .map(|f| f.path.clone())
108 .collect();
109 let deficit = crate::core::context_deficit::detect_deficit(
110 &ledger, intent, &known,
111 );
112 if !deficit.suggested_files.is_empty() {
113 result.push_str("\n\n--- SUGGESTED FILES ---");
114 for s in &deficit.suggested_files {
115 result.push_str(&format!(
116 "\n {} ({:?}, ~{} tok, mode: {})",
117 s.path, s.reason, s.estimated_tokens, s.recommended_mode
118 ));
119 }
120 }
121
122 let pressure = ledger.pressure();
123 if pressure.utilization > 0.7 {
124 let plan = ledger.reinjection_plan(intent, 0.6);
125 if !plan.actions.is_empty() {
126 result.push_str("\n\n--- REINJECTION PLAN ---");
127 result.push_str(&format!(
128 "\n Context pressure: {:.0}% -> target: 60%",
129 pressure.utilization * 100.0
130 ));
131 for a in &plan.actions {
132 result.push_str(&format!(
133 "\n {} : {} -> {} (frees ~{} tokens)",
134 a.path, a.current_mode, a.new_mode, a.tokens_freed
135 ));
136 }
137 result.push_str(&format!(
138 "\n Total freeable: {} tokens",
139 plan.total_tokens_freed
140 ));
141 }
142 }
143 }
144 }
145 }
146 }
147 }
148
149 Ok(ToolOutput {
150 text: result,
151 original_tokens: 0,
152 saved_tokens: 0,
153 mode: Some("preload".to_string()),
154 path: None,
155 changed: false,
156 })
157 }
158}
159
160fn predict_and_prefetch(
165 task: &str,
166 cache: &mut crate::core::cache::SessionCache,
167 project_root: &str,
168) -> String {
169 crate::core::providers::init::init_with_project_root(Some(std::path::Path::new(project_root)));
170 let registry = crate::core::providers::registry::global_registry();
171 let available = registry.available_provider_ids();
172 if available.is_empty() {
173 return String::new();
174 }
175
176 let mut bandit = crate::core::provider_bandit::ProviderBandit::new();
177 let predictions =
178 crate::core::active_inference::predict_preloads(task, &available, &mut bandit, 2);
179
180 if predictions.is_empty() {
181 return String::new();
182 }
183
184 let cfg = crate::core::config::Config::load();
185 let auto_index = cfg.providers.auto_index;
186 let mut all_artifacts = Vec::new();
187
188 let mut out = String::from("\n\n--- PROVIDER PRELOAD ---");
189 let mut prefetched = 0usize;
190
191 for pred in &predictions {
192 let params = crate::core::providers::provider_trait::ProviderParams {
193 limit: Some(5),
194 ..Default::default()
195 };
196
197 match registry.execute_as_chunks(&pred.provider_id, &pred.action, ¶ms) {
198 Ok(chunks) => {
199 let artifacts = crate::core::consolidation::consolidate(&chunks);
200 for entry in &artifacts.cache_entries {
201 cache.store(&entry.uri, &entry.content);
202 prefetched += 1;
203 }
204 if auto_index && !artifacts.is_empty() {
205 all_artifacts.push(artifacts);
206 }
207 out.push_str(&format!(
208 "\n {} {} → {} items cached (confidence: {:.0}%)",
209 pred.provider_id,
210 pred.action,
211 chunks.len(),
212 pred.confidence * 100.0,
213 ));
214 }
215 Err(e) => {
216 tracing::debug!(
217 "[preload] provider {}/{} failed: {e}",
218 pred.provider_id,
219 pred.action,
220 );
221 }
222 }
223 }
224
225 if prefetched == 0 {
226 return String::new();
227 }
228
229 if !all_artifacts.is_empty() {
230 let root = project_root.to_string();
231 std::thread::spawn(move || {
232 let merged = merge_preload_artifacts(&all_artifacts);
233 crate::tools::ctx_provider::apply_artifacts_to_stores(&merged, &root);
234 });
235 }
236
237 out
238}
239
240fn merge_preload_artifacts(
241 all: &[crate::core::consolidation::ConsolidationArtifacts],
242) -> crate::core::consolidation::ConsolidationArtifacts {
243 let mut merged = crate::core::consolidation::ConsolidationArtifacts::default();
244 for a in all {
245 merged.bm25_chunks.extend(a.bm25_chunks.clone());
246 merged.edges.extend(a.edges.clone());
247 merged.facts.extend(a.facts.clone());
248 merged.cache_entries.extend(a.cache_entries.clone());
249 }
250 merged
251}