lash_sansio/
tool_contract.rs

1/// How a tool's invocations should be scheduled relative to other tools in
2/// the same batch of model-produced tool calls.
3///
4/// Tools that only *read* state (`read_file`, `grep`, `glob`, ...) can run
5/// in parallel safely and should use the default [`ToolScheduling::Parallel`].
6/// Tools that *mutate* shared state (`apply_patch`, `exec_command`,
7/// `write_stdin`) should declare
8/// [`ToolScheduling::Serial`] so the dispatcher runs them one-at-a-time
9/// and avoids interleaving with each other.
10///
11/// This controls scheduling within a batch of tool calls; protocol ownership
12/// is selected by the host plugin stack.
13#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
14#[serde(rename_all = "snake_case")]
15pub enum ToolScheduling {
16    /// Safe to run concurrently with other parallel tools in the same batch.
17    #[default]
18    Parallel,
19    /// Must run one-at-a-time relative to other serial tools in the batch.
20    Serial,
21}
22
23fn default_tool_scheduling() -> ToolScheduling {
24    ToolScheduling::default()
25}
26
27fn is_default_tool_scheduling(mode: &ToolScheduling) -> bool {
28    *mode == ToolScheduling::default()
29}
30
31/// Automatic retry policy for a tool's execution.
32///
33/// This is intentionally separate from [`ToolScheduling`]: scheduling
34/// decides whether different tool calls may run together, while retry policy
35/// decides whether one failed call may be attempted again inside its scheduled
36/// slot.
37#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
38#[serde(tag = "type", rename_all = "snake_case")]
39pub enum ToolRetryPolicy {
40    /// Never retry automatically. This is the default for every tool.
41    #[default]
42    Never,
43    /// Retry only failures that explicitly report a safe retry disposition.
44    Safe {
45        max_attempts: u32,
46        base_delay_ms: u64,
47        max_delay_ms: u64,
48    },
49    /// Retry only failures that explicitly report a safe retry disposition,
50    /// and only when the runtime can provide a stable replay key.
51    Idempotent {
52        max_attempts: u32,
53        base_delay_ms: u64,
54        max_delay_ms: u64,
55    },
56}
57
58impl ToolRetryPolicy {
59    pub fn safe(max_attempts: u32, base_delay_ms: u64, max_delay_ms: u64) -> Self {
60        Self::Safe {
61            max_attempts,
62            base_delay_ms,
63            max_delay_ms,
64        }
65    }
66
67    pub fn idempotent(max_attempts: u32, base_delay_ms: u64, max_delay_ms: u64) -> Self {
68        Self::Idempotent {
69            max_attempts,
70            base_delay_ms,
71            max_delay_ms,
72        }
73    }
74
75    pub fn max_attempts(self) -> u32 {
76        match self {
77            Self::Never => 1,
78            Self::Safe { max_attempts, .. } | Self::Idempotent { max_attempts, .. } => {
79                max_attempts.max(1)
80            }
81        }
82    }
83
84    pub fn delay_ms_for_retry(self, retry_index: u32, requested_after_ms: Option<u64>) -> u64 {
85        let (base_delay_ms, max_delay_ms) = match self {
86            Self::Never => return 0,
87            Self::Safe {
88                base_delay_ms,
89                max_delay_ms,
90                ..
91            }
92            | Self::Idempotent {
93                base_delay_ms,
94                max_delay_ms,
95                ..
96            } => (base_delay_ms, max_delay_ms),
97        };
98        let multiplier = 1_u64.checked_shl(retry_index).unwrap_or(u64::MAX);
99        let backoff = base_delay_ms.saturating_mul(multiplier);
100        let delay = requested_after_ms.unwrap_or(backoff);
101        if max_delay_ms == 0 {
102            delay
103        } else {
104            delay.min(max_delay_ms)
105        }
106    }
107
108    pub fn requires_replay_key(self) -> bool {
109        matches!(self, Self::Idempotent { .. })
110    }
111}
112
113fn default_tool_retry_policy() -> ToolRetryPolicy {
114    ToolRetryPolicy::default()
115}
116
117fn is_default_tool_retry_policy(policy: &ToolRetryPolicy) -> bool {
118    *policy == ToolRetryPolicy::default()
119}
120
121#[derive(
122    Clone,
123    Copy,
124    Debug,
125    Default,
126    PartialEq,
127    Eq,
128    PartialOrd,
129    Ord,
130    serde::Serialize,
131    serde::Deserialize,
132)]
133#[serde(rename_all = "snake_case")]
134pub enum ToolAvailability {
135    /// Keep the tool out of the current surface entirely.
136    ///
137    /// The definition can remain in registry state so host or authority
138    /// overrides survive refreshes, but the model cannot search, see, or call
139    /// the tool.
140    #[default]
141    Off,
142    /// Include the tool in the searchable catalog, but not in the model's
143    /// callable tool list.
144    Searchable,
145    /// Include the tool in the model's callable tool list, without featuring
146    /// it in prompt-side tool documentation.
147    Callable,
148    /// Include the tool in the callable list and feature it in prompt-side
149    /// tool documentation.
150    Showcased,
151}
152
153impl ToolAvailability {
154    pub fn is_searchable(self) -> bool {
155        self >= Self::Searchable
156    }
157
158    pub fn is_callable(self) -> bool {
159        self >= Self::Callable
160    }
161
162    pub fn is_showcased(self) -> bool {
163        self >= Self::Showcased
164    }
165}
166
167#[derive(Clone, Debug, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
168pub struct ToolAvailabilityConfig {
169    pub base: ToolAvailability,
170}
171
172impl ToolAvailabilityConfig {
173    pub fn same(availability: ToolAvailability) -> Self {
174        Self { base: availability }
175    }
176
177    pub fn showcased() -> Self {
178        Self::same(ToolAvailability::Showcased)
179    }
180
181    pub fn callable() -> Self {
182        Self::same(ToolAvailability::Callable)
183    }
184
185    pub fn off() -> Self {
186        Self::same(ToolAvailability::Off)
187    }
188
189    pub fn base(&self) -> ToolAvailability {
190        self.base
191    }
192}
193
194impl Default for ToolAvailabilityConfig {
195    fn default() -> Self {
196        Self::showcased()
197    }
198}
199
200#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
201#[serde(rename_all = "snake_case")]
202pub enum ToolActivation {
203    #[default]
204    Always,
205    Internal,
206}
207
208fn is_default_tool_availability_config(config: &ToolAvailabilityConfig) -> bool {
209    *config == ToolAvailabilityConfig::default()
210}
211
212fn is_default_tool_activation(activation: &ToolActivation) -> bool {
213    *activation == ToolActivation::default()
214}
215
216#[derive(Clone, Debug, Default, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
217pub struct LashlangToolBinding {
218    #[serde(default, skip_serializing_if = "Vec::is_empty")]
219    pub module_path: Vec<String>,
220    #[serde(default, skip_serializing_if = "Option::is_none")]
221    pub operation: Option<String>,
222    #[serde(default, skip_serializing_if = "Option::is_none")]
223    pub authority_type: Option<String>,
224    #[serde(default, skip_serializing_if = "Vec::is_empty")]
225    pub aliases: Vec<String>,
226}
227
228impl LashlangToolBinding {
229    pub fn new(
230        module_path: impl IntoIterator<Item = impl Into<String>>,
231        operation: impl Into<String>,
232    ) -> Self {
233        Self {
234            module_path: module_path.into_iter().map(Into::into).collect(),
235            operation: Some(operation.into()),
236            authority_type: None,
237            aliases: Vec::new(),
238        }
239    }
240
241    pub fn with_authority_type(mut self, authority_type: impl Into<String>) -> Self {
242        self.authority_type = Some(authority_type.into());
243        self
244    }
245
246    pub fn with_aliases(mut self, aliases: impl IntoIterator<Item = impl Into<String>>) -> Self {
247        self.aliases = aliases.into_iter().map(Into::into).collect();
248        self
249    }
250
251    pub fn executable_for(&self, tool_name: &str) -> ResolvedLashlangToolBinding {
252        let module_path = if self.module_path.is_empty() {
253            vec!["tools".to_string()]
254        } else {
255            self.module_path.clone()
256        };
257        let operation = self
258            .operation
259            .as_deref()
260            .filter(|operation| !operation.trim().is_empty())
261            .unwrap_or(tool_name)
262            .to_string();
263        let authority_type = self
264            .authority_type
265            .as_deref()
266            .filter(|authority_type| !authority_type.trim().is_empty())
267            .map(ToOwned::to_owned)
268            .unwrap_or_else(|| default_authority_type(&module_path));
269        ResolvedLashlangToolBinding {
270            module_path,
271            operation,
272            authority_type,
273            aliases: self.aliases.clone(),
274        }
275    }
276
277    /// Resolve a remote-callable surface without applying local prompt fallbacks.
278    ///
279    /// Remote hosts must provide an explicit module path and operation so
280    /// serialized tool grants have one canonical call path. This deliberately
281    /// rejects the prompt-only conveniences used by [`Self::executable_for`],
282    /// where an empty module path falls back to `tools` and an empty operation
283    /// falls back to the flat tool name.
284    pub fn required_for_remote(
285        manifest: &ToolManifest,
286    ) -> Result<ResolvedLashlangToolBinding, String> {
287        manifest
288            .lashlang_binding
289            .required_executable_for_remote(&manifest.name)
290    }
291
292    pub fn required_executable_for_remote(
293        &self,
294        tool_name: &str,
295    ) -> Result<ResolvedLashlangToolBinding, String> {
296        if self.module_path.is_empty() {
297            return Err(format!(
298                "tool `{tool_name}` is missing an explicit remote module path"
299            ));
300        }
301        if let Some(empty) = self.module_path.iter().find(|part| part.trim().is_empty()) {
302            return Err(format!(
303                "tool `{tool_name}` has an empty remote module path segment `{empty}`"
304            ));
305        }
306        let Some(operation) = self
307            .operation
308            .as_deref()
309            .map(str::trim)
310            .filter(|operation| !operation.is_empty())
311        else {
312            return Err(format!(
313                "tool `{tool_name}` is missing an explicit remote operation"
314            ));
315        };
316        let authority_type = self
317            .authority_type
318            .as_deref()
319            .filter(|authority_type| !authority_type.trim().is_empty())
320            .map(ToOwned::to_owned)
321            .unwrap_or_else(|| default_authority_type(&self.module_path));
322        Ok(ResolvedLashlangToolBinding {
323            module_path: self.module_path.clone(),
324            operation: operation.to_string(),
325            authority_type,
326            aliases: self.aliases.clone(),
327        })
328    }
329
330    pub fn is_empty(&self) -> bool {
331        self.module_path.is_empty()
332            && self.operation.is_none()
333            && self.authority_type.is_none()
334            && self.aliases.is_empty()
335    }
336}
337
338#[derive(Clone, Debug, PartialEq, Eq)]
339pub struct ResolvedLashlangToolBinding {
340    pub module_path: Vec<String>,
341    pub operation: String,
342    pub authority_type: String,
343    pub aliases: Vec<String>,
344}
345
346impl ResolvedLashlangToolBinding {
347    pub fn module_path_string(&self) -> String {
348        self.module_path.join(".")
349    }
350
351    pub fn call_path(&self) -> String {
352        format!("{}.{}", self.module_path_string(), self.operation)
353    }
354}
355
356fn default_authority_type(module_path: &[String]) -> String {
357    let base = module_path
358        .first()
359        .map(String::as_str)
360        .unwrap_or("tools")
361        .trim_matches('_');
362    let mut out = String::new();
363    for part in base.split('_').filter(|part| !part.is_empty()) {
364        let mut chars = part.chars();
365        if let Some(first) = chars.next() {
366            out.extend(first.to_uppercase());
367            out.extend(chars);
368        }
369    }
370    if out.is_empty() {
371        "Tools".to_string()
372    } else {
373        out
374    }
375}
376
377#[derive(Clone, Debug, Default, PartialEq, serde::Serialize, serde::Deserialize)]
378#[serde(tag = "kind", rename_all = "snake_case")]
379pub enum ToolOutputContract {
380    #[default]
381    Static,
382    FromInputSchema {
383        input_field: String,
384        #[serde(default, skip_serializing_if = "Option::is_none")]
385        default_schema: Option<serde_json::Value>,
386    },
387}
388
389impl ToolOutputContract {
390    pub fn from_input_schema(
391        input_field: impl Into<String>,
392        default_schema: Option<serde_json::Value>,
393    ) -> Self {
394        Self::FromInputSchema {
395            input_field: input_field.into(),
396            default_schema,
397        }
398    }
399
400    pub fn is_static(&self) -> bool {
401        matches!(self, Self::Static)
402    }
403
404    fn return_type_label(&self, static_schema: &serde_json::Value) -> String {
405        match self {
406            Self::Static => compact_schema_label(static_schema),
407            Self::FromInputSchema { .. } => "T".to_string(),
408        }
409    }
410
411    fn type_parameter_suffix(&self) -> Option<String> {
412        match self {
413            Self::Static => None,
414            Self::FromInputSchema { default_schema, .. } => {
415                let default = default_schema
416                    .as_ref()
417                    .map(compact_schema_label)
418                    .unwrap_or_else(|| "any".to_string());
419                Some(format!("<T = {default}>"))
420            }
421        }
422    }
423
424    fn apply_type_witness_parameter(&self, params: &mut [ParameterDoc]) {
425        let Self::FromInputSchema { input_field, .. } = self else {
426            return;
427        };
428        if let Some(param) = params.iter_mut().find(|param| param.name == *input_field) {
429            param.type_label = "TypeSpec<T>".to_string();
430            param.nullable = false;
431            param.default_value = None;
432            param.enum_values.clear();
433            param.minimum = None;
434            param.maximum = None;
435            param.min_length = None;
436            param.max_length = None;
437            param.min_items = None;
438            param.max_items = None;
439            param.item_type = None;
440        }
441    }
442
443    fn return_fields(&self, static_schema: &serde_json::Value) -> Vec<serde_json::Value> {
444        match self {
445            Self::Static => return_field_metadata(static_schema),
446            Self::FromInputSchema { .. } => Vec::new(),
447        }
448    }
449}
450
451#[derive(Clone, Debug, Default, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
452#[serde(tag = "kind", rename_all = "snake_case")]
453pub enum ToolArgumentProjectionPolicy {
454    #[default]
455    MaterializeProjectedValues,
456    PreserveProjectedRefsInField {
457        field: String,
458    },
459}
460
461impl ToolArgumentProjectionPolicy {
462    pub fn preserve_projected_refs_in_field(field: impl Into<String>) -> Self {
463        Self::PreserveProjectedRefsInField {
464            field: field.into(),
465        }
466    }
467
468    pub fn is_materialize_projected_values(&self) -> bool {
469        matches!(self, Self::MaterializeProjectedValues)
470    }
471}
472
473fn is_default_tool_argument_projection_policy(policy: &ToolArgumentProjectionPolicy) -> bool {
474    policy.is_materialize_projected_values()
475}
476
477#[derive(
478    Clone,
479    Debug,
480    Default,
481    PartialEq,
482    Eq,
483    PartialOrd,
484    Ord,
485    Hash,
486    serde::Serialize,
487    serde::Deserialize,
488)]
489#[serde(transparent)]
490pub struct ToolId(String);
491
492impl ToolId {
493    pub fn new(id: impl Into<String>) -> Self {
494        let id = id.into();
495        assert!(!id.trim().is_empty(), "tool id must not be empty");
496        Self(id)
497    }
498
499    pub fn default_for_name(name: &str) -> Self {
500        Self::new(format!("tool:{name}"))
501    }
502
503    pub fn as_str(&self) -> &str {
504        &self.0
505    }
506}
507
508impl From<String> for ToolId {
509    fn from(id: String) -> Self {
510        Self::new(id)
511    }
512}
513
514impl From<&str> for ToolId {
515    fn from(id: &str) -> Self {
516        Self::new(id)
517    }
518}
519
520impl std::fmt::Display for ToolId {
521    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
522        f.write_str(&self.0)
523    }
524}
525
526/// Tool metadata exposed to prompts, catalogs, UI, and availability checks.
527/// The optional compact contract is the catalog-facing projection of the
528/// resolved contract; full schemas stay in [`ToolContract`].
529#[derive(Clone, Debug, Default, serde::Serialize, serde::Deserialize)]
530pub struct ToolManifest {
531    pub id: ToolId,
532    pub name: String,
533    #[serde(default, skip_serializing_if = "String::is_empty")]
534    pub description: String,
535    #[serde(default, skip_serializing_if = "Option::is_none")]
536    pub compact_contract: Option<CompactToolContract>,
537    #[serde(default, skip_serializing_if = "is_default_tool_availability_config")]
538    pub availability: ToolAvailabilityConfig,
539    #[serde(default, skip_serializing_if = "is_default_tool_activation")]
540    pub activation: ToolActivation,
541    #[serde(default, skip_serializing_if = "Option::is_none")]
542    pub availability_override: Option<ToolAvailability>,
543    #[serde(default, skip_serializing_if = "LashlangToolBinding::is_empty")]
544    pub lashlang_binding: LashlangToolBinding,
545    #[serde(
546        default,
547        skip_serializing_if = "is_default_tool_argument_projection_policy"
548    )]
549    pub argument_projection: ToolArgumentProjectionPolicy,
550    #[serde(
551        default = "default_tool_scheduling",
552        skip_serializing_if = "is_default_tool_scheduling"
553    )]
554    pub scheduling: ToolScheduling,
555    #[serde(
556        default = "default_tool_retry_policy",
557        skip_serializing_if = "is_default_tool_retry_policy"
558    )]
559    pub retry_policy: ToolRetryPolicy,
560}
561
562impl ToolManifest {
563    pub fn effective_availability(&self) -> ToolAvailability {
564        self.availability_override
565            .unwrap_or_else(|| self.availability.base())
566    }
567}
568
569/// Heavy tool contract resolved only when a prompt or call needs schemas/docs.
570#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
571pub struct ToolContract {
572    #[serde(default = "ToolContract::default_input_schema")]
573    pub input_schema: serde_json::Value,
574    #[serde(default)]
575    pub output_schema: serde_json::Value,
576    #[serde(default, skip_serializing_if = "Vec::is_empty")]
577    pub input_schema_projections: Vec<SchemaProjectionOverride>,
578    #[serde(default, skip_serializing_if = "Vec::is_empty")]
579    pub output_schema_projections: Vec<SchemaProjectionOverride>,
580    #[serde(default, skip_serializing_if = "ToolOutputContract::is_static")]
581    pub output_contract: ToolOutputContract,
582    #[serde(default, skip_serializing_if = "Vec::is_empty")]
583    pub examples: Vec<String>,
584}
585
586impl Default for ToolContract {
587    fn default() -> Self {
588        Self {
589            input_schema: Self::default_input_schema(),
590            output_schema: serde_json::Value::Null,
591            input_schema_projections: Vec::new(),
592            output_schema_projections: Vec::new(),
593            output_contract: ToolOutputContract::Static,
594            examples: Vec::new(),
595        }
596    }
597}
598
599impl ToolContract {
600    pub fn default_input_schema() -> serde_json::Value {
601        serde_json::json!({
602            "type": "object",
603            "properties": {},
604            "additionalProperties": true
605        })
606    }
607
608    pub fn compact_contract(&self, manifest: &ToolManifest) -> CompactToolContract {
609        self.compact_contract_with_example_limit(manifest, COMPACT_TOOL_EXAMPLE_LIMIT)
610    }
611
612    pub fn compact_contract_with_example_limit(
613        &self,
614        manifest: &ToolManifest,
615        example_limit: usize,
616    ) -> CompactToolContract {
617        let lashlang_binding = manifest.lashlang_binding.executable_for(&manifest.name);
618        CompactToolContract {
619            name: lashlang_binding.call_path(),
620            signature: self.input_signature(manifest),
621            returns: self.output_summary(),
622            parameters: self.parameter_metadata(),
623            return_fields: self.output_contract.return_fields(&self.output_schema),
624            description: manifest.description.trim().to_string(),
625            examples: compact_examples(&self.examples, example_limit),
626        }
627    }
628
629    pub fn input_signature(&self, manifest: &ToolManifest) -> String {
630        let lashlang_binding = manifest.lashlang_binding.executable_for(&manifest.name);
631        let params = self
632            .parameter_docs()
633            .into_iter()
634            .map(|p| p.signature_fragment())
635            .collect::<Vec<_>>();
636        let body = if params.is_empty() {
637            "{}".to_string()
638        } else {
639            format!("{{ {} }}", params.join(", "))
640        };
641        format!(
642            "await {}{}({})?",
643            lashlang_binding.call_path(),
644            self.output_contract
645                .type_parameter_suffix()
646                .unwrap_or_default(),
647            body
648        )
649    }
650
651    pub fn output_summary(&self) -> String {
652        self.output_contract.return_type_label(&self.output_schema)
653    }
654
655    pub fn parameter_metadata(&self) -> Vec<serde_json::Value> {
656        self.parameter_docs()
657            .into_iter()
658            .map(|param| param.into_value())
659            .collect()
660    }
661
662    pub fn model_tool(&self, manifest: &ToolManifest) -> ModelTool {
663        ModelTool {
664            name: manifest.name.clone(),
665            description: manifest.description.clone(),
666            input_schema: self.input_schema.clone(),
667            output_schema: self.output_schema.clone(),
668            input_schema_projections: self.input_schema_projections.clone(),
669            output_schema_projections: self.output_schema_projections.clone(),
670        }
671    }
672
673    fn parameter_docs(&self) -> Vec<ParameterDoc> {
674        let mut params = schema_parameter_docs(&self.input_schema);
675        self.output_contract
676            .apply_type_witness_parameter(&mut params);
677        params
678    }
679}
680
681/// Static authoring helper for tools.
682///
683/// Composes the runtime [`ToolManifest`] and [`ToolContract`] projections. Both
684/// are `#[serde(flatten)]`ed so the serialized JSON shape stays flat (and wire/
685/// persistence compatible); the two structs have disjoint field names.
686#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
687pub struct ToolDefinition {
688    #[serde(flatten)]
689    pub manifest: ToolManifest,
690    #[serde(flatten)]
691    pub contract: ToolContract,
692}
693
694#[derive(Clone, Debug, PartialEq, Eq)]
695pub struct ModelTool {
696    pub name: String,
697    pub description: String,
698    pub input_schema: serde_json::Value,
699    pub output_schema: serde_json::Value,
700    pub input_schema_projections: Vec<SchemaProjectionOverride>,
701    pub output_schema_projections: Vec<SchemaProjectionOverride>,
702}
703
704#[derive(Clone, Debug, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
705pub struct SchemaProjectionOverride {
706    pub profile: String,
707    pub schema: serde_json::Value,
708}
709
710const COMPACT_TOOL_EXAMPLE_LIMIT: usize = 2;
711const COMPACT_TOOL_EXAMPLE_CHAR_LIMIT: usize = 240;
712
713#[derive(Clone, Debug, PartialEq, serde::Serialize, serde::Deserialize)]
714pub struct CompactToolContract {
715    pub name: String,
716    pub signature: String,
717    pub returns: String,
718    #[serde(default, skip_serializing_if = "Vec::is_empty")]
719    pub parameters: Vec<serde_json::Value>,
720    #[serde(default, skip_serializing_if = "Vec::is_empty")]
721    pub return_fields: Vec<serde_json::Value>,
722    #[serde(default, skip_serializing_if = "String::is_empty")]
723    pub description: String,
724    #[serde(default, skip_serializing_if = "Vec::is_empty")]
725    pub examples: Vec<String>,
726}
727
728impl CompactToolContract {
729    pub fn render_signature_head(&self) -> String {
730        format!("{} -> {}", self.signature.trim(), self.returns.trim())
731    }
732
733    pub fn render_signature(&self) -> String {
734        let mut sections = vec![self.render_signature_head()];
735        let parameter_lines = self
736            .parameters
737            .iter()
738            .filter_map(compact_doc_line)
739            .collect::<Vec<_>>();
740        if !parameter_lines.is_empty() {
741            sections.push(format!("Parameters:\n{}", parameter_lines.join("\n")));
742        }
743        let return_field_lines = self
744            .return_fields
745            .iter()
746            .filter_map(compact_doc_line)
747            .collect::<Vec<_>>();
748        if !return_field_lines.is_empty() {
749            sections.push(format!("Return fields:\n{}", return_field_lines.join("\n")));
750        }
751        sections.join("\n")
752    }
753
754    pub fn render_returns(&self) -> String {
755        let mut sections = Vec::new();
756        let return_field_lines = self
757            .return_fields
758            .iter()
759            .filter_map(compact_doc_line)
760            .collect::<Vec<_>>();
761        if !return_field_lines.is_empty() {
762            sections.push(format!("Return fields:\n{}", return_field_lines.join("\n")));
763        }
764        sections.join("\n")
765    }
766
767    pub fn render_markdown(&self) -> String {
768        let mut sections = vec![format!("### {}", self.render_signature_head())];
769        if !self.description.trim().is_empty() {
770            sections.push(self.description.trim().to_string());
771        }
772        if !self.parameters.is_empty() {
773            sections.push(format!(
774                "Parameters:\n{}",
775                self.parameters
776                    .iter()
777                    .filter_map(compact_doc_line)
778                    .collect::<Vec<_>>()
779                    .join("\n")
780            ));
781        }
782        if !self.return_fields.is_empty() {
783            sections.push(format!(
784                "Return fields:\n{}",
785                self.return_fields
786                    .iter()
787                    .filter_map(compact_doc_line)
788                    .collect::<Vec<_>>()
789                    .join("\n")
790            ));
791        }
792        if !self.examples.is_empty() {
793            sections.push(format!("Examples: {}", self.examples.join("; ")));
794        }
795        sections.join("\n")
796    }
797}
798
799impl ToolDefinition {
800    pub fn raw_with_id(
801        id: impl Into<ToolId>,
802        name: impl Into<String>,
803        description: impl Into<String>,
804        input_schema: serde_json::Value,
805        output_schema: serde_json::Value,
806    ) -> Self {
807        Self {
808            manifest: ToolManifest {
809                id: id.into(),
810                name: name.into(),
811                description: description.into(),
812                compact_contract: None,
813                ..ToolManifest::default()
814            },
815            contract: ToolContract {
816                input_schema,
817                output_schema,
818                ..ToolContract::default()
819            },
820        }
821    }
822
823    pub fn raw_named(
824        name: impl Into<String>,
825        description: impl Into<String>,
826        input_schema: serde_json::Value,
827        output_schema: serde_json::Value,
828    ) -> Self {
829        let name = name.into();
830        Self::raw_with_id(
831            ToolId::default_for_name(&name),
832            name,
833            description,
834            input_schema,
835            output_schema,
836        )
837    }
838
839    pub fn typed_with_id<Args, Output>(
840        id: impl Into<ToolId>,
841        name: impl Into<String>,
842        description: impl Into<String>,
843    ) -> Self
844    where
845        Args: schemars::JsonSchema,
846        Output: schemars::JsonSchema,
847    {
848        Self::raw_with_id(
849            id,
850            name,
851            description,
852            schema_for::<Args>(),
853            schema_for::<Output>(),
854        )
855    }
856
857    pub fn typed<Args, Output>(name: impl Into<String>, description: impl Into<String>) -> Self
858    where
859        Args: schemars::JsonSchema,
860        Output: schemars::JsonSchema,
861    {
862        let name = name.into();
863        Self::typed_with_id::<Args, Output>(ToolId::default_for_name(&name), name, description)
864    }
865
866    pub fn raw(
867        id: impl Into<ToolId>,
868        name: impl Into<String>,
869        description: impl Into<String>,
870        input_schema: serde_json::Value,
871        output_schema: serde_json::Value,
872    ) -> Self {
873        Self::raw_with_id(id, name, description, input_schema, output_schema)
874    }
875
876    pub fn with_examples(mut self, examples: Vec<String>) -> Self {
877        self.contract.examples = examples;
878        self
879    }
880
881    pub fn with_availability(mut self, availability: ToolAvailabilityConfig) -> Self {
882        self.manifest.availability = availability;
883        self
884    }
885
886    pub fn with_activation(mut self, activation: ToolActivation) -> Self {
887        self.manifest.activation = activation;
888        self
889    }
890
891    pub fn with_lashlang_binding(mut self, lashlang_binding: LashlangToolBinding) -> Self {
892        self.manifest.lashlang_binding = lashlang_binding;
893        self
894    }
895
896    pub fn with_argument_projection(
897        mut self,
898        argument_projection: ToolArgumentProjectionPolicy,
899    ) -> Self {
900        self.manifest.argument_projection = argument_projection;
901        self
902    }
903
904    pub fn with_scheduling(mut self, scheduling: ToolScheduling) -> Self {
905        self.manifest.scheduling = scheduling;
906        self
907    }
908
909    pub fn with_retry_policy(mut self, retry_policy: ToolRetryPolicy) -> Self {
910        self.manifest.retry_policy = retry_policy;
911        self
912    }
913
914    pub fn with_output_contract(mut self, output_contract: ToolOutputContract) -> Self {
915        self.contract.output_contract = output_contract;
916        self
917    }
918
919    pub fn with_input_schema_projection(
920        mut self,
921        profile: impl Into<String>,
922        schema: serde_json::Value,
923    ) -> Self {
924        let profile = profile.into();
925        self.contract
926            .input_schema_projections
927            .retain(|projection| projection.profile != profile);
928        self.contract
929            .input_schema_projections
930            .push(SchemaProjectionOverride { profile, schema });
931        self
932    }
933
934    pub fn with_output_schema_projection(
935        mut self,
936        profile: impl Into<String>,
937        schema: serde_json::Value,
938    ) -> Self {
939        let profile = profile.into();
940        self.contract
941            .output_schema_projections
942            .retain(|projection| projection.profile != profile);
943        self.contract
944            .output_schema_projections
945            .push(SchemaProjectionOverride { profile, schema });
946        self
947    }
948
949    pub fn with_output_from_input_schema(
950        self,
951        input_field: impl Into<String>,
952        default_schema: Option<serde_json::Value>,
953    ) -> Self {
954        self.with_output_contract(ToolOutputContract::from_input_schema(
955            input_field,
956            default_schema,
957        ))
958    }
959
960    pub fn default_input_schema() -> serde_json::Value {
961        ToolContract::default_input_schema()
962    }
963
964    /// Tool identity. Read very widely, so exposed as a thin accessor over the
965    /// composed [`ToolManifest`].
966    pub fn id(&self) -> &ToolId {
967        &self.manifest.id
968    }
969
970    /// Tool name. Read very widely, so exposed as a thin accessor.
971    pub fn name(&self) -> &str {
972        &self.manifest.name
973    }
974
975    /// Tool description. Read very widely, so exposed as a thin accessor.
976    pub fn description(&self) -> &str {
977        &self.manifest.description
978    }
979
980    pub fn input_signature(&self) -> String {
981        self.contract.input_signature(&self.manifest)
982    }
983
984    pub fn output_summary(&self) -> String {
985        self.contract.output_summary()
986    }
987
988    pub fn signature(&self) -> String {
989        format!("{} -> {}", self.input_signature(), self.output_summary())
990    }
991
992    pub fn compact_contract(&self) -> CompactToolContract {
993        self.compact_contract_with_example_limit(COMPACT_TOOL_EXAMPLE_LIMIT)
994    }
995
996    pub fn compact_contract_with_example_limit(&self, example_limit: usize) -> CompactToolContract {
997        self.contract
998            .compact_contract_with_example_limit(&self.manifest, example_limit)
999    }
1000
1001    pub fn effective_availability(&self) -> ToolAvailability {
1002        self.manifest.effective_availability()
1003    }
1004
1005    pub fn model_tool(&self) -> ModelTool {
1006        self.contract.model_tool(&self.manifest)
1007    }
1008
1009    /// Project the manifest, computing the catalog-facing compact contract from
1010    /// the resolved [`ToolContract`].
1011    pub fn manifest(&self) -> ToolManifest {
1012        let mut manifest = self.manifest.clone();
1013        manifest.compact_contract = Some(self.contract.compact_contract(&manifest));
1014        manifest
1015    }
1016
1017    pub fn contract(&self) -> ToolContract {
1018        self.contract.clone()
1019    }
1020
1021    /// Recompose a definition from its [`ToolManifest`] and [`ToolContract`]
1022    /// projections — the inverse of [`ToolDefinition::manifest`]/[`ToolDefinition::contract`].
1023    pub fn from_parts(manifest: ToolManifest, contract: ToolContract) -> Self {
1024        Self { manifest, contract }
1025    }
1026
1027    pub fn format_tool_docs(tools: &[ToolDefinition]) -> String {
1028        Self::format_tool_docs_iter(tools.iter())
1029    }
1030
1031    pub fn format_tool_docs_iter<'a>(
1032        tools: impl IntoIterator<Item = &'a ToolDefinition>,
1033    ) -> String {
1034        tools
1035            .into_iter()
1036            .map(|tool| tool.compact_contract().render_markdown())
1037            .collect::<Vec<_>>()
1038            .join("\n\n")
1039    }
1040
1041    pub fn parameter_metadata(&self) -> Vec<serde_json::Value> {
1042        self.parameter_docs()
1043            .into_iter()
1044            .map(|param| param.into_value())
1045            .collect()
1046    }
1047
1048    fn parameter_docs(&self) -> Vec<ParameterDoc> {
1049        let mut params = schema_parameter_docs(&self.contract.input_schema);
1050        self.contract
1051            .output_contract
1052            .apply_type_witness_parameter(&mut params);
1053        params
1054    }
1055}
1056
1057mod schema_docs;
1058pub use schema_docs::schema_for;
1059use schema_docs::{
1060    ParameterDoc, compact_doc_line, compact_examples, compact_schema_label, return_field_metadata,
1061    schema_parameter_docs,
1062};
1063
1064mod schema_validation;
1065pub use schema_validation::{LashSchema, validate_tool_input};
1066
1067include!("tool_contract/tests.rs");
lash_sansio/tool_contract.rs

lash_sansio/
tool_contract.rs
