diff --git a/crates/tinymist-query/src/analysis.rs b/crates/tinymist-query/src/analysis.rs
index 94f3637d..92447ece 100644
--- a/crates/tinymist-query/src/analysis.rs
+++ b/crates/tinymist-query/src/analysis.rs
@@ -1,7 +1,6 @@
 //! Semantic static and dynamic analysis of the source code.
 
 mod bib;
-use std::path::Path;
 
 pub(crate) use bib::*;
 pub mod call;
@@ -24,11 +23,6 @@ pub mod signature;
 pub use signature::*;
 pub mod semantic_tokens;
 pub use semantic_tokens::*;
-use tinymist_std::ImmutPath;
-use tinymist_world::vfs::WorkspaceResolver;
-use tinymist_world::WorldDeps;
-use typst::syntax::Source;
-use typst::World;
 mod post_tyck;
 mod tyck;
 pub(crate) use crate::ty::*;
@@ -39,13 +33,21 @@ mod prelude;
 mod global;
 pub use global::*;
 
+use std::path::Path;
+use std::sync::Arc;
+
 use ecow::{eco_format, EcoVec};
 use lsp_types::Url;
+use tinymist_project::LspComputeGraph;
+use tinymist_std::{bail, ImmutPath, Result};
+use tinymist_world::vfs::WorkspaceResolver;
+use tinymist_world::{EntryReader, TaskInputs, WorldDeps};
 use typst::diag::{FileError, FileResult};
 use typst::foundations::{Func, Value};
-use typst::syntax::FileId;
+use typst::syntax::{FileId, Source};
+use typst::World;
 
-use crate::path_res_to_url;
+use crate::{path_res_to_url, CompilerQueryResponse, SemanticRequest, StatefulRequest};
 
 pub(crate) trait ToFunc {
     fn to_func(&self) -> Option<Func>;
@@ -124,6 +126,64 @@ impl LspWorldExt for tinymist_project::LspWorld {
     }
 }
 
+/// A snapshot for LSP queries.
+pub struct LspQuerySnapshot {
+    /// The using snapshot.
+    pub snap: LspComputeGraph,
+    /// The global shared analysis data.
+    analysis: Arc<Analysis>,
+    /// The revision lock for the analysis (cache).
+    rev_lock: AnalysisRevLock,
+}
+
+impl std::ops::Deref for LspQuerySnapshot {
+    type Target = LspComputeGraph;
+
+    fn deref(&self) -> &Self::Target {
+        &self.snap
+    }
+}
+
+impl LspQuerySnapshot {
+    /// Runs a query for another task.
+    pub fn task(mut self, inputs: TaskInputs) -> Self {
+        self.snap = self.snap.task(inputs);
+        self
+    }
+
+    /// Runs a stateful query.
+    pub fn run_stateful<T: StatefulRequest>(
+        self,
+        query: T,
+        wrapper: fn(Option<T::Response>) -> CompilerQueryResponse,
+    ) -> Result<CompilerQueryResponse> {
+        let graph = self.snap.clone();
+        self.run_analysis(|ctx| query.request(ctx, graph))
+            .map(wrapper)
+    }
+
+    /// Runs a semantic query.
+    pub fn run_semantic<T: SemanticRequest>(
+        self,
+        query: T,
+        wrapper: fn(Option<T::Response>) -> CompilerQueryResponse,
+    ) -> Result<CompilerQueryResponse> {
+        self.run_analysis(|ctx| query.request(ctx)).map(wrapper)
+    }
+
+    /// Runs a query.
+    pub fn run_analysis<T>(self, f: impl FnOnce(&mut LocalContextGuard) -> T) -> Result<T> {
+        let world = self.snap.world().clone();
+        let Some(..) = world.main_id() else {
+            log::error!("Project: main file is not set");
+            bail!("main file is not set");
+        };
+
+        let mut ctx = self.analysis.enter_(world, self.rev_lock);
+        Ok(f(&mut ctx))
+    }
+}
+
 #[cfg(test)]
 mod matcher_tests {
 
@@ -611,9 +671,7 @@ mod lint_tests {
             let source = ctx.source_by_path(&path).unwrap();
 
             let result = tinymist_lint::lint_source(&source);
-            let result =
-                crate::diagnostics::CheckDocWorker::new(&ctx.world, ctx.position_encoding())
-                    .convert_all(result.iter());
+            let result = crate::diagnostics::DiagWorker::new(ctx).convert_all(result.iter());
             let result = result
                 .into_iter()
                 .map(|(k, v)| (file_path_(&k), v))
diff --git a/crates/tinymist-query/src/analysis/definition.rs b/crates/tinymist-query/src/analysis/definition.rs
index bae64f59..019ce409 100644
--- a/crates/tinymist-query/src/analysis/definition.rs
+++ b/crates/tinymist-query/src/analysis/definition.rs
@@ -354,7 +354,7 @@ fn value_to_def(value: Value, name: impl FnOnce() -> Option<Interned<str>>) -> O
 }
 
 struct DefResolver {
-    ei: Arc<ExprInfo>,
+    ei: ExprInfo,
 }
 
 impl DefResolver {
diff --git a/crates/tinymist-query/src/analysis/global.rs b/crates/tinymist-query/src/analysis/global.rs
index e2387be0..fb59a078 100644
--- a/crates/tinymist-query/src/analysis/global.rs
+++ b/crates/tinymist-query/src/analysis/global.rs
@@ -11,7 +11,7 @@ use rustc_hash::FxHashMap;
 use tinymist_analysis::stats::AllocStats;
 use tinymist_analysis::ty::term_value;
 use tinymist_analysis::{analyze_expr_, analyze_import_};
-use tinymist_project::LspWorld;
+use tinymist_project::{LspComputeGraph, LspWorld};
 use tinymist_std::hash::{hash128, FxDashMap};
 use tinymist_std::typst::TypstDocument;
 use tinymist_world::debug_loc::DataSource;
@@ -24,6 +24,7 @@ use typst::syntax::package::{PackageManifest, PackageSpec};
 use typst::syntax::{Span, VirtualPath};
 use typst_shim::eval::{eval_compat, Eval};
 
+use super::{LspQuerySnapshot, TypeEnv};
 use crate::adt::revision::{RevisionLock, RevisionManager, RevisionManagerLike, RevisionSlot};
 use crate::analysis::prelude::*;
 use crate::analysis::{
@@ -42,8 +43,6 @@ use crate::{
     ColorTheme, CompilerQueryRequest, LspPosition, LspRange, LspWorldExt, PositionEncoding,
 };
 
-use super::TypeEnv;
-
 macro_rules! interned_str {
     ($name:ident, $value:expr) => {
         static $name: LazyLock<Interned<str>> = LazyLock::new(|| $value.into());
@@ -80,13 +79,13 @@ pub struct Analysis {
 }
 
 impl Analysis {
-    /// Get a snapshot of the analysis data.
-    pub fn snapshot(&self, world: LspWorld) -> LocalContextGuard {
-        self.snapshot_(world, self.lock_revision(None))
+    /// Enters the analysis context.
+    pub fn enter(&self, world: LspWorld) -> LocalContextGuard {
+        self.enter_(world, self.lock_revision(None))
     }
 
-    /// Get a snapshot of the analysis data.
-    pub fn snapshot_(&self, world: LspWorld, mut lg: AnalysisRevLock) -> LocalContextGuard {
+    /// Enters the analysis context.
+    pub(crate) fn enter_(&self, world: LspWorld, mut lg: AnalysisRevLock) -> LocalContextGuard {
         let lifetime = self.caches.lifetime.fetch_add(1, Ordering::SeqCst);
         let slot = self
             .analysis_rev_cache
@@ -94,7 +93,7 @@ impl Analysis {
             .find_revision(world.revision(), &lg);
         let tokens = lg.tokens.take();
         LocalContextGuard {
-            rev_lock: lg,
+            _rev_lock: lg,
             local: LocalContext {
                 tokens,
                 caches: AnalysisLocalCaches::default(),
@@ -108,7 +107,21 @@ impl Analysis {
         }
     }
 
-    /// Lock the revision in *main thread*.
+    /// Gets a snapshot for language queries.
+    pub fn query_snapshot(
+        self: Arc<Self>,
+        snap: LspComputeGraph,
+        req: Option<&CompilerQueryRequest>,
+    ) -> LspQuerySnapshot {
+        let rev_lock = self.lock_revision(req);
+        LspQuerySnapshot {
+            snap,
+            analysis: self,
+            rev_lock,
+        }
+    }
+
+    /// Locks the revision in *main thread*.
     #[must_use]
     pub fn lock_revision(&self, req: Option<&CompilerQueryRequest>) -> AnalysisRevLock {
         let mut grid = self.analysis_rev_cache.lock();
@@ -209,7 +222,7 @@ pub struct LocalContextGuard {
     /// The guarded local context
     pub local: LocalContext,
     /// The revision lock
-    pub rev_lock: AnalysisRevLock,
+    _rev_lock: AnalysisRevLock,
 }
 
 impl Deref for LocalContextGuard {
@@ -430,12 +443,12 @@ impl LocalContext {
     }
 
     /// Get the expression information of a source file.
-    pub(crate) fn expr_stage_by_id(&mut self, fid: TypstFileId) -> Option<Arc<ExprInfo>> {
+    pub(crate) fn expr_stage_by_id(&mut self, fid: TypstFileId) -> Option<ExprInfo> {
         Some(self.expr_stage(&self.source_by_id(fid).ok()?))
     }
 
     /// Get the expression information of a source file.
-    pub(crate) fn expr_stage(&mut self, source: &Source) -> Arc<ExprInfo> {
+    pub(crate) fn expr_stage(&mut self, source: &Source) -> ExprInfo {
         let id = source.id();
         let cache = &self.caches.modules.entry(id).or_default().expr_stage;
         cache.get_or_init(|| self.shared.expr_stage(source)).clone()
@@ -692,12 +705,12 @@ impl SharedContext {
     }
 
     /// Get the expression information of a source file.
-    pub(crate) fn expr_stage_by_id(self: &Arc<Self>, fid: TypstFileId) -> Option<Arc<ExprInfo>> {
+    pub(crate) fn expr_stage_by_id(self: &Arc<Self>, fid: TypstFileId) -> Option<ExprInfo> {
         Some(self.expr_stage(&self.source_by_id(fid).ok()?))
     }
 
     /// Get the expression information of a source file.
-    pub(crate) fn expr_stage(self: &Arc<Self>, source: &Source) -> Arc<ExprInfo> {
+    pub(crate) fn expr_stage(self: &Arc<Self>, source: &Source) -> ExprInfo {
         let mut route = ExprRoute::default();
         self.expr_stage_(source, &mut route)
     }
@@ -707,7 +720,7 @@ impl SharedContext {
         self: &Arc<Self>,
         source: &Source,
         route: &mut ExprRoute,
-    ) -> Arc<ExprInfo> {
+    ) -> ExprInfo {
         use crate::syntax::expr_of;
         let guard = self.query_stat(source.id(), "expr_stage");
         self.slot.expr_stage.compute(hash128(&source), |prev| {
@@ -1155,7 +1168,7 @@ pub struct AnalysisLocalCaches {
 /// change.
 #[derive(Default)]
 pub struct ModuleAnalysisLocalCache {
-    expr_stage: OnceLock<Arc<ExprInfo>>,
+    expr_stage: OnceLock<ExprInfo>,
     type_check: OnceLock<Arc<TypeInfo>>,
 }
 
@@ -1243,7 +1256,7 @@ impl Drop for AnalysisRevLock {
 #[derive(Default, Clone)]
 struct AnalysisRevSlot {
     revision: usize,
-    expr_stage: IncrCacheMap<u128, Arc<ExprInfo>>,
+    expr_stage: IncrCacheMap<u128, ExprInfo>,
     type_check: IncrCacheMap<u128, Arc<TypeInfo>>,
 }
 
diff --git a/crates/tinymist-query/src/analysis/semantic_tokens.rs b/crates/tinymist-query/src/analysis/semantic_tokens.rs
index a7c73809..d87b5a9f 100644
--- a/crates/tinymist-query/src/analysis/semantic_tokens.rs
+++ b/crates/tinymist-query/src/analysis/semantic_tokens.rs
@@ -309,7 +309,7 @@ pub(crate) struct Tokenizer {
     pos_offset: usize,
     output: Vec<SemanticToken>,
     source: Source,
-    ei: Arc<ExprInfo>,
+    ei: ExprInfo,
     encoding: PositionEncoding,
 
     allow_multiline_token: bool,
@@ -320,7 +320,7 @@ pub(crate) struct Tokenizer {
 impl Tokenizer {
     pub fn new(
         source: Source,
-        ei: Arc<ExprInfo>,
+        ei: ExprInfo,
         allow_multiline_token: bool,
         encoding: PositionEncoding,
     ) -> Self {
diff --git a/crates/tinymist-query/src/analysis/tyck.rs b/crates/tinymist-query/src/analysis/tyck.rs
index c4cb9695..517fd7c9 100644
--- a/crates/tinymist-query/src/analysis/tyck.rs
+++ b/crates/tinymist-query/src/analysis/tyck.rs
@@ -25,13 +25,13 @@ pub(crate) use select::*;
 #[derive(Default)]
 pub struct TypeEnv {
     visiting: FxHashMap<TypstFileId, Arc<TypeInfo>>,
-    exprs: FxHashMap<TypstFileId, Option<Arc<ExprInfo>>>,
+    exprs: FxHashMap<TypstFileId, Option<ExprInfo>>,
 }
 
 /// Type checking at the source unit level.
 pub(crate) fn type_check(
     ctx: Arc<SharedContext>,
-    ei: Arc<ExprInfo>,
+    ei: ExprInfo,
     env: &mut TypeEnv,
 ) -> Arc<TypeInfo> {
     let mut info = TypeInfo::default();
@@ -82,7 +82,7 @@ type CallCacheDesc = (
 
 pub(crate) struct TypeChecker<'a> {
     ctx: Arc<SharedContext>,
-    ei: Arc<ExprInfo>,
+    ei: ExprInfo,
 
     info: TypeInfo,
     module_exports: FxHashMap<(TypstFileId, Interned<str>), OnceLock<Option<Ty>>>,
diff --git a/crates/tinymist-query/src/check.rs b/crates/tinymist-query/src/check.rs
new file mode 100644
index 00000000..f15ecadb
--- /dev/null
+++ b/crates/tinymist-query/src/check.rs
@@ -0,0 +1,19 @@
+use tinymist_project::LspCompiledArtifact;
+
+use crate::{prelude::*, DiagWorker, DiagnosticsMap, SemanticRequest};
+
+/// A request to check the document for errors and lints.
+#[derive(Clone)]
+pub struct CheckRequest {
+    /// The compilation result of the document.
+    pub snap: LspCompiledArtifact,
+}
+
+impl SemanticRequest for CheckRequest {
+    type Response = DiagnosticsMap;
+
+    fn request(self, ctx: &mut LocalContext) -> Option<Self::Response> {
+        let worker = DiagWorker::new(ctx);
+        Some(worker.check().convert_all(self.snap.diagnostics()))
+    }
+}
diff --git a/crates/tinymist-query/src/diagnostics.rs b/crates/tinymist-query/src/diagnostics.rs
index 7a302b02..dbdc4dd4 100644
--- a/crates/tinymist-query/src/diagnostics.rs
+++ b/crates/tinymist-query/src/diagnostics.rs
@@ -4,7 +4,7 @@ use tinymist_project::LspWorld;
 use tinymist_world::vfs::WorkspaceResolver;
 use typst::{diag::SourceDiagnostic, syntax::Span};
 
-use crate::{prelude::*, LspWorldExt};
+use crate::{analysis::Analysis, prelude::*, LspWorldExt};
 
 use regex::RegexSet;
 
@@ -16,52 +16,44 @@ type TypstSeverity = typst::diag::Severity;
 
 /// Converts a list of Typst diagnostics to LSP diagnostics,
 /// with potential refinements on the error messages.
-pub fn check_doc<'a>(
+pub fn convert_diagnostics<'a>(
     world: &LspWorld,
     errors: impl IntoIterator<Item = &'a TypstDiagnostic>,
     position_encoding: PositionEncoding,
 ) -> DiagnosticsMap {
-    CheckDocWorker::new(world, position_encoding)
-        .check()
-        .convert_all(errors)
+    let analysis = Analysis {
+        position_encoding,
+        ..Analysis::default()
+    };
+    let mut ctx = analysis.enter(world.clone());
+    DiagWorker::new(&mut ctx).convert_all(errors)
 }
 
-/// Context for converting Typst diagnostics to LSP diagnostics.
-pub(crate) struct CheckDocWorker<'a> {
+/// The worker for collecting diagnostics.
+pub(crate) struct DiagWorker<'a> {
     /// The world surface for Typst compiler.
-    pub world: &'a LspWorld,
-    /// The position encoding for the source.
-    pub position_encoding: PositionEncoding,
+    pub ctx: &'a mut LocalContext,
     /// Results
     pub results: DiagnosticsMap,
 }
 
-impl std::ops::Deref for CheckDocWorker<'_> {
-    type Target = LspWorld;
-
-    fn deref(&self) -> &Self::Target {
-        self.world
-    }
-}
-
-impl<'w> CheckDocWorker<'w> {
+impl<'w> DiagWorker<'w> {
     /// Creates a new `CheckDocWorker` instance.
-    pub fn new(world: &'w LspWorld, position_encoding: PositionEncoding) -> Self {
+    pub fn new(ctx: &'w mut LocalContext) -> Self {
         Self {
-            world,
-            position_encoding,
+            ctx,
             results: DiagnosticsMap::default(),
         }
     }
 
     /// Runs code check on the document.
     pub fn check(mut self) -> Self {
-        for dep in self.world.depended_files() {
+        for dep in self.ctx.world.depended_files() {
             if WorkspaceResolver::is_package_file(dep) {
                 continue;
             }
 
-            let Ok(source) = self.world.source(dep) else {
+            let Ok(source) = self.ctx.world.source(dep) else {
                 continue;
             };
             let res = lint_source(&source);
@@ -89,7 +81,7 @@ impl<'w> CheckDocWorker<'w> {
 
     /// Converts a list of Typst diagnostics to LSP diagnostics.
     pub fn handle(&mut self, diag: &TypstDiagnostic) {
-        match convert_diagnostic(self, diag) {
+        match self.convert_diagnostic(diag) {
             Ok((uri, diagnostic)) => {
                 self.results.entry(uri).or_default().push(diagnostic);
             }
@@ -98,121 +90,92 @@ impl<'w> CheckDocWorker<'w> {
             }
         }
     }
-}
 
-fn convert_diagnostic(
-    ctx: &CheckDocWorker,
-    typst_diagnostic: &TypstDiagnostic,
-) -> anyhow::Result<(Url, Diagnostic)> {
-    let typst_diagnostic = {
-        let mut diag = Cow::Borrowed(typst_diagnostic);
+    fn convert_diagnostic(
+        &self,
+        typst_diagnostic: &TypstDiagnostic,
+    ) -> anyhow::Result<(Url, Diagnostic)> {
+        let typst_diagnostic = {
+            let mut diag = Cow::Borrowed(typst_diagnostic);
 
-        // Extend more refiners here by adding their instances.
-        let refiners: &[&dyn DiagnosticRefiner] =
-            &[&DeprecationRefiner::<13> {}, &OutOfRootHintRefiner {}];
+            // Extend more refiners here by adding their instances.
+            let refiners: &[&dyn DiagnosticRefiner] =
+                &[&DeprecationRefiner::<13> {}, &OutOfRootHintRefiner {}];
 
-        // NOTE: It would be nice to have caching here.
-        for refiner in refiners {
-            if refiner.matches(&diag) {
-                diag = Cow::Owned(refiner.refine(diag.into_owned()));
+            // NOTE: It would be nice to have caching here.
+            for refiner in refiners {
+                if refiner.matches(&diag) {
+                    diag = Cow::Owned(refiner.refine(diag.into_owned()));
+                }
             }
-        }
-        diag
-    };
+            diag
+        };
 
-    let (id, span) = diagnostic_span_id(ctx, &typst_diagnostic);
-    let uri = ctx.uri_for_id(id)?;
-    let source = ctx.source(id)?;
-    let lsp_range = diagnostic_range(&source, span, ctx.position_encoding);
+        let (id, span) = self.diagnostic_span_id(&typst_diagnostic);
+        let uri = self.ctx.uri_for_id(id)?;
+        let source = self.ctx.source_by_id(id)?;
+        let lsp_range = self.diagnostic_range(&source, span);
 
-    let lsp_severity = diagnostic_severity(typst_diagnostic.severity);
-    let lsp_message = diagnostic_message(&typst_diagnostic);
+        let lsp_severity = diagnostic_severity(typst_diagnostic.severity);
+        let lsp_message = diagnostic_message(&typst_diagnostic);
 
-    let tracepoints =
-        diagnostic_related_information(ctx, &typst_diagnostic, ctx.position_encoding)?;
+        let diagnostic = Diagnostic {
+            range: lsp_range,
+            severity: Some(lsp_severity),
+            message: lsp_message,
+            source: Some("typst".to_owned()),
+            related_information: (!typst_diagnostic.trace.is_empty()).then(|| {
+                typst_diagnostic
+                    .trace
+                    .iter()
+                    .flat_map(|tracepoint| self.to_related_info(tracepoint))
+                    .collect()
+            }),
+            ..Default::default()
+        };
 
-    let diagnostic = Diagnostic {
-        range: lsp_range,
-        severity: Some(lsp_severity),
-        message: lsp_message,
-        source: Some("typst".to_owned()),
-        related_information: Some(tracepoints),
-        ..Default::default()
-    };
-
-    Ok((uri, diagnostic))
-}
-
-fn tracepoint_to_relatedinformation(
-    ctx: &CheckDocWorker,
-    tracepoint: &Spanned<Tracepoint>,
-    position_encoding: PositionEncoding,
-) -> anyhow::Result<Option<DiagnosticRelatedInformation>> {
-    if let Some(id) = tracepoint.span.id() {
-        let uri = ctx.uri_for_id(id)?;
-        let source = ctx.source(id)?;
-
-        if let Some(typst_range) = source.range(tracepoint.span) {
-            let lsp_range = to_lsp_range(typst_range, &source, position_encoding);
-
-            return Ok(Some(DiagnosticRelatedInformation {
-                location: LspLocation {
-                    uri,
-                    range: lsp_range,
-                },
-                message: tracepoint.v.to_string(),
-            }));
-        }
+        Ok((uri, diagnostic))
     }
 
-    Ok(None)
-}
+    fn to_related_info(
+        &self,
+        tracepoint: &Spanned<Tracepoint>,
+    ) -> Option<DiagnosticRelatedInformation> {
+        let id = tracepoint.span.id()?;
+        // todo: expensive uri_for_id
+        let uri = self.ctx.uri_for_id(id).ok()?;
+        let source = self.ctx.source_by_id(id).ok()?;
 
-fn diagnostic_related_information(
-    project: &CheckDocWorker,
-    typst_diagnostic: &TypstDiagnostic,
-    position_encoding: PositionEncoding,
-) -> anyhow::Result<Vec<DiagnosticRelatedInformation>> {
-    let mut tracepoints = vec![];
+        let typst_range = source.range(tracepoint.span)?;
+        let lsp_range = self.ctx.to_lsp_range(typst_range, &source);
 
-    for tracepoint in &typst_diagnostic.trace {
-        if let Some(info) =
-            tracepoint_to_relatedinformation(project, tracepoint, position_encoding)?
-        {
-            tracepoints.push(info);
-        }
+        Some(DiagnosticRelatedInformation {
+            location: LspLocation {
+                uri,
+                range: lsp_range,
+            },
+            message: tracepoint.v.to_string(),
+        })
     }
 
-    Ok(tracepoints)
-}
+    fn diagnostic_span_id(&self, typst_diagnostic: &TypstDiagnostic) -> (TypstFileId, Span) {
+        iter::once(typst_diagnostic.span)
+            .chain(typst_diagnostic.trace.iter().map(|trace| trace.span))
+            .find_map(|span| Some((span.id()?, span)))
+            .unwrap_or_else(|| (self.ctx.world.main(), Span::detached()))
+    }
 
-fn diagnostic_span_id(
-    ctx: &CheckDocWorker,
-    typst_diagnostic: &TypstDiagnostic,
-) -> (TypstFileId, Span) {
-    iter::once(typst_diagnostic.span)
-        .chain(typst_diagnostic.trace.iter().map(|trace| trace.span))
-        .find_map(|span| Some((span.id()?, span)))
-        .unwrap_or_else(|| (ctx.main(), Span::detached()))
-}
-
-fn diagnostic_range(
-    source: &Source,
-    typst_span: Span,
-    position_encoding: PositionEncoding,
-) -> LspRange {
-    // Due to nvaner/typst-lsp#241 and maybe typst/typst#2035, we sometimes fail to
-    // find the span. In that case, we use a default span as a better
-    // alternative to panicking.
-    //
-    // This may have been fixed after Typst 0.7.0, but it's still nice to avoid
-    // panics in case something similar reappears.
-    match source.find(typst_span) {
-        Some(node) => {
-            let typst_range = node.range();
-            to_lsp_range(typst_range, source, position_encoding)
+    fn diagnostic_range(&self, source: &Source, typst_span: Span) -> LspRange {
+        // Due to nvaner/typst-lsp#241 and maybe typst/typst#2035, we sometimes fail to
+        // find the span. In that case, we use a default span as a better
+        // alternative to panicking.
+        //
+        // This may have been fixed after Typst 0.7.0, but it's still nice to avoid
+        // panics in case something similar reappears.
+        match source.find(typst_span) {
+            Some(node) => self.ctx.to_lsp_range(node.range(), source),
+            None => LspRange::new(LspPosition::new(0, 0), LspPosition::new(0, 0)),
         }
-        None => LspRange::new(LspPosition::new(0, 0), LspPosition::new(0, 0)),
     }
 }
 
diff --git a/crates/tinymist-query/src/docs/module.rs b/crates/tinymist-query/src/docs/module.rs
index d42be28c..78934843 100644
--- a/crates/tinymist-query/src/docs/module.rs
+++ b/crates/tinymist-query/src/docs/module.rs
@@ -1,7 +1,6 @@
 //! Module documentation.
 
 use std::collections::HashMap;
-use std::sync::Arc;
 
 use ecow::{eco_vec, EcoString, EcoVec};
 use itertools::Itertools;
@@ -113,7 +112,7 @@ struct ScanDefCtx<'a> {
 }
 
 impl ScanDefCtx<'_> {
-    fn defs(&mut self, paths: EcoVec<&str>, ei: Arc<ExprInfo>) -> DefInfo {
+    fn defs(&mut self, paths: EcoVec<&str>, ei: ExprInfo) -> DefInfo {
         let name = {
             let stem = ei.fid.vpath().as_rooted_path().file_stem();
             stem.and_then(|s| Some(Interned::new_str(s.to_str()?)))
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@if_set.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@if_set.typ.snap
index b79641d1..996dfa55 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@if_set.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@if_set.typ.snap
@@ -8,7 +8,6 @@ input_file: crates/tinymist-query/src/fixtures/lint/if_set.typ
   {
    "message": "This set statement doesn't take effect.\nHint: consider changing parent to `set text(red) if (false)`",
    "range": "1:2:1:15",
-   "relatedInformation": [],
    "severity": 2,
    "source": "typst"
   }
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@if_show.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@if_show.typ.snap
index 17e9809a..476d9b76 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@if_show.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@if_show.typ.snap
@@ -8,7 +8,6 @@ input_file: crates/tinymist-query/src/fixtures/lint/if_show.typ
   {
    "message": "This show statement doesn't take effect.\nHint: consider changing parent to `show : if (false) { .. }`",
    "range": "1:2:1:17",
-   "relatedInformation": [],
    "severity": 2,
    "source": "typst"
   }
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@show_set.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@show_set.typ.snap
index 40085edf..a3a7b23f 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@show_set.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@show_set.typ.snap
@@ -8,7 +8,6 @@ input_file: crates/tinymist-query/src/fixtures/lint/show_set.typ
   {
    "message": "This set statement doesn't take effect.\nHint: consider changing parent to `show : set text(red)`",
    "range": "1:2:1:15",
-   "relatedInformation": [],
    "severity": 2,
    "source": "typst"
   }
diff --git a/crates/tinymist-query/src/fixtures/lint/snaps/test@show_set2.typ.snap b/crates/tinymist-query/src/fixtures/lint/snaps/test@show_set2.typ.snap
index 54932b5c..4b7adcce 100644
--- a/crates/tinymist-query/src/fixtures/lint/snaps/test@show_set2.typ.snap
+++ b/crates/tinymist-query/src/fixtures/lint/snaps/test@show_set2.typ.snap
@@ -8,7 +8,6 @@ input_file: crates/tinymist-query/src/fixtures/lint/show_set2.typ
   {
    "message": "This set statement doesn't take effect.\nHint: consider changing parent to `show raw: set text(red)`",
    "range": "1:2:1:15",
-   "relatedInformation": [],
    "severity": 2,
    "source": "typst"
   }
diff --git a/crates/tinymist-query/src/lib.rs b/crates/tinymist-query/src/lib.rs
index 0ad7de5c..19a7555b 100644
--- a/crates/tinymist-query/src/lib.rs
+++ b/crates/tinymist-query/src/lib.rs
@@ -12,6 +12,7 @@ pub use completion::{CompletionRequest, PostfixSnippet};
 pub use typlite::ColorTheme;
 pub use upstream::with_vm;
 
+pub use check::*;
 pub use code_action::*;
 pub use code_context::*;
 pub use code_lens::*;
@@ -55,6 +56,7 @@ mod adt;
 mod lsp_typst_boundary;
 mod prelude;
 
+mod check;
 mod code_action;
 mod code_context;
 mod code_lens;
diff --git a/crates/tinymist-query/src/syntax/expr.rs b/crates/tinymist-query/src/syntax/expr.rs
index 82cfb285..e2dc5ce6 100644
--- a/crates/tinymist-query/src/syntax/expr.rs
+++ b/crates/tinymist-query/src/syntax/expr.rs
@@ -32,8 +32,8 @@ pub(crate) fn expr_of(
     source: Source,
     route: &mut ExprRoute,
     guard: QueryStatGuard,
-    prev: Option<Arc<ExprInfo>>,
-) -> Arc<ExprInfo> {
+    prev: Option<ExprInfo>,
+) -> ExprInfo {
     crate::log_debug_ct!("expr_of: {:?}", source.id());
 
     route.insert(source.id(), None);
@@ -76,8 +76,18 @@ pub(crate) fn expr_of(
     let docstrings_base = Arc::new(Mutex::new(FxHashMap::default()));
     let docstrings = docstrings_base.clone();
 
-    let exprs_base = Arc::new(Mutex::new(FxHashMap::default()));
-    let exprs = exprs_base.clone();
+    let exprs_base: Arc<
+        parking_lot::lock_api::Mutex<
+            parking_lot::RawMutex,
+            HashMap<Span, Expr, rustc_hash::FxBuildHasher>,
+        >,
+    > = Arc::new(Mutex::new(FxHashMap::default()));
+    let exprs: Arc<
+        parking_lot::lock_api::Mutex<
+            parking_lot::RawMutex,
+            HashMap<Span, Expr, rustc_hash::FxBuildHasher>,
+        >,
+    > = exprs_base.clone();
 
     let imports_base = Arc::new(Mutex::new(FxHashMap::default()));
     let imports = imports_base.clone();
@@ -120,7 +130,7 @@ pub(crate) fn expr_of(
         (root_scope, root)
     };
 
-    let info = ExprInfo {
+    let info = ExprInfoRepr {
         fid: source.id(),
         revision,
         source: source.clone(),
@@ -135,11 +145,22 @@ pub(crate) fn expr_of(
     crate::log_debug_ct!("expr_of end {:?}", source.id());
 
     route.remove(&info.fid);
-    Arc::new(info)
+    ExprInfo(Arc::new(LazyHash::new(info)))
+}
+
+#[derive(Debug, Clone, Hash)]
+pub struct ExprInfo(Arc<LazyHash<ExprInfoRepr>>);
+
+impl Deref for ExprInfo {
+    type Target = Arc<LazyHash<ExprInfoRepr>>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
 }
 
 #[derive(Debug)]
-pub struct ExprInfo {
+pub struct ExprInfoRepr {
     pub fid: TypstFileId,
     pub revision: usize,
     pub source: Source,
@@ -152,19 +173,22 @@ pub struct ExprInfo {
     pub root: Expr,
 }
 
-impl std::hash::Hash for ExprInfo {
+impl std::hash::Hash for ExprInfoRepr {
     fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
         self.revision.hash(state);
         self.source.hash(state);
         self.exports.hash(state);
         self.root.hash(state);
+        let mut resolves = self.resolves.iter().collect::<Vec<_>>();
+        resolves.sort_by_key(|(fid, _)| fid.into_raw());
+        resolves.hash(state);
         let mut imports = self.imports.iter().collect::<Vec<_>>();
         imports.sort_by_key(|(fid, _)| *fid);
         imports.hash(state);
     }
 }
 
-impl ExprInfo {
+impl ExprInfoRepr {
     pub fn get_def(&self, decl: &Interned<Decl>) -> Option<Expr> {
         if decl.is_def() {
             return Some(Expr::Decl(decl.clone()));
diff --git a/crates/tinymist-query/src/tests.rs b/crates/tinymist-query/src/tests.rs
index 80f3f4cb..933f7c70 100644
--- a/crates/tinymist-query/src/tests.rs
+++ b/crates/tinymist-query/src/tests.rs
@@ -90,7 +90,7 @@ pub fn run_with_ctx<T>(
         },
         ..Analysis::default()
     })
-    .snapshot(world);
+    .enter(world);
 
     ctx.test_package_list(|| {
         vec![(
diff --git a/crates/tinymist/src/project.rs b/crates/tinymist/src/project.rs
index 35cb374b..8330e1ca 100644
--- a/crates/tinymist/src/project.rs
+++ b/crates/tinymist/src/project.rs
@@ -28,10 +28,9 @@ use parking_lot::Mutex;
 use reflexo::{hash::FxHashMap, path::unix_slash};
 use sync_ls::{LspClient, TypedLspClient};
 use tinymist_project::vfs::{FileChangeSet, MemoryEvent};
+use tinymist_query::analysis::{Analysis, LspQuerySnapshot, PeriscopeProvider};
 use tinymist_query::{
-    analysis::{Analysis, AnalysisRevLock, LocalContextGuard, PeriscopeProvider},
-    CompilerQueryRequest, CompilerQueryResponse, DiagnosticsMap, LocalContext, SemanticRequest,
-    StatefulRequest,
+    CheckRequest, CompilerQueryRequest, DiagnosticsMap, LocalContext, SemanticRequest,
 };
 use tinymist_render::PeriscopeRenderer;
 use tinymist_std::{error::prelude::*, ImmutPath};
@@ -303,14 +302,7 @@ impl ProjectState {
     /// Snapshot the compiler thread for language queries
     pub fn query_snapshot(&mut self, q: Option<&CompilerQueryRequest>) -> Result<LspQuerySnapshot> {
         let snap = self.snapshot()?;
-        let analysis = self.analysis.clone();
-        let rev_lock = analysis.lock_revision(q);
-
-        Ok(LspQuerySnapshot {
-            snap,
-            analysis,
-            rev_lock,
-        })
+        Ok(self.analysis.clone().query_snapshot(snap, q))
     }
 
     pub fn do_interrupt(compiler: &mut LspProjectCompiler, intr: Interrupt<LspCompilerFeat>) {
@@ -451,12 +443,15 @@ impl CompileHandlerImpl {
 
         let snap = snap.clone();
         let editor_tx = self.editor_tx.clone();
-        let enc = self.analysis.position_encoding;
+        let analysis = self.analysis.clone();
         rayon::spawn(move || {
-            let world = snap.world();
+            let world = snap.world().clone();
+            let mut ctx = analysis.enter(world);
 
             // todo: check all errors in this file
-            let diagnostics = tinymist_query::check_doc(world, snap.diagnostics(), enc);
+            let Some(diagnostics) = CheckRequest { snap }.request(&mut ctx) else {
+                return;
+            };
 
             log::trace!("notify diagnostics({dv:?}): {diagnostics:#?}");
 
@@ -640,53 +635,3 @@ impl CompileHandler<LspCompilerFeat, ProjectInsStateExt> for CompileHandlerImpl
 }
 
 pub type QuerySnapWithStat = (LspQuerySnapshot, QueryStatGuard);
-
-pub struct LspQuerySnapshot {
-    pub snap: LspComputeGraph,
-    analysis: Arc<Analysis>,
-    rev_lock: AnalysisRevLock,
-}
-
-impl std::ops::Deref for LspQuerySnapshot {
-    type Target = LspComputeGraph;
-
-    fn deref(&self) -> &Self::Target {
-        &self.snap
-    }
-}
-
-impl LspQuerySnapshot {
-    pub fn task(mut self, inputs: TaskInputs) -> Self {
-        self.snap = self.snap.task(inputs);
-        self
-    }
-
-    pub fn run_stateful<T: StatefulRequest>(
-        self,
-        query: T,
-        wrapper: fn(Option<T::Response>) -> CompilerQueryResponse,
-    ) -> Result<CompilerQueryResponse> {
-        let graph = self.snap.clone();
-        self.run_analysis(|ctx| query.request(ctx, graph))
-            .map(wrapper)
-    }
-
-    pub fn run_semantic<T: SemanticRequest>(
-        self,
-        query: T,
-        wrapper: fn(Option<T::Response>) -> CompilerQueryResponse,
-    ) -> Result<CompilerQueryResponse> {
-        self.run_analysis(|ctx| query.request(ctx)).map(wrapper)
-    }
-
-    pub fn run_analysis<T>(self, f: impl FnOnce(&mut LocalContextGuard) -> T) -> Result<T> {
-        let world = self.snap.world().clone();
-        let Some(..) = world.main_id() else {
-            log::error!("Project: main file is not set");
-            bail!("main file is not set");
-        };
-
-        let mut analysis = self.analysis.snapshot_(world, self.rev_lock);
-        Ok(f(&mut analysis))
-    }
-}
diff --git a/crates/tinymist/src/task/user_action.rs b/crates/tinymist/src/task/user_action.rs
index 82d2c99b..f2650a75 100644
--- a/crates/tinymist/src/task/user_action.rs
+++ b/crates/tinymist/src/task/user_action.rs
@@ -177,7 +177,8 @@ async fn trace_main(
     let timings = writer.into_inner().unwrap();
 
     let handle = &state.project;
-    let diagnostics = tinymist_query::check_doc(w, diags.iter(), handle.analysis.position_encoding);
+    let diagnostics =
+        tinymist_query::convert_diagnostics(w, diags.iter(), handle.analysis.position_encoding);
 
     let rpc_kind = rpc_kind.as_str();
 
diff --git a/crates/tinymist/src/tool/testing.rs b/crates/tinymist/src/tool/testing.rs
index c6fbdd22..538e7c16 100644
--- a/crates/tinymist/src/tool/testing.rs
+++ b/crates/tinymist/src/tool/testing.rs
@@ -240,7 +240,7 @@ pub async fn test_main(args: TestArgs) -> Result<()> {
 }
 
 fn test_once(world: &LspWorld, ctx: &TestContext) -> Result<bool> {
-    let mut actx = ctx.analysis.snapshot(world.clone());
+    let mut actx = ctx.analysis.enter(world.clone());
     let doc = typst::compile::<TypstPagedDocument>(&actx.world).output?;
 
     let suites =