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, serde::Serialize, serde::Deserialize)]
217#[serde(tag = "kind", rename_all = "snake_case")]
218pub enum ToolOutputContract {
219    #[default]
220    Static,
221    FromInputSchema {
222        input_field: String,
223        #[serde(default, skip_serializing_if = "Option::is_none")]
224        default_schema: Option<serde_json::Value>,
225    },
226}
227
228impl ToolOutputContract {
229    pub fn from_input_schema(
230        input_field: impl Into<String>,
231        default_schema: Option<serde_json::Value>,
232    ) -> Self {
233        Self::FromInputSchema {
234            input_field: input_field.into(),
235            default_schema,
236        }
237    }
238
239    pub fn is_static(&self) -> bool {
240        matches!(self, Self::Static)
241    }
242
243    fn return_type_label(&self, static_schema: &serde_json::Value) -> String {
244        match self {
245            Self::Static => compact_schema_label(static_schema),
246            Self::FromInputSchema { .. } => "T".to_string(),
247        }
248    }
249
250    fn type_parameter_suffix(&self) -> Option<String> {
251        match self {
252            Self::Static => None,
253            Self::FromInputSchema { default_schema, .. } => {
254                let default = default_schema
255                    .as_ref()
256                    .map(compact_schema_label)
257                    .unwrap_or_else(|| "any".to_string());
258                Some(format!("<T = {default}>"))
259            }
260        }
261    }
262
263    fn apply_type_witness_parameter(&self, params: &mut [ParameterDoc]) {
264        let Self::FromInputSchema { input_field, .. } = self else {
265            return;
266        };
267        if let Some(param) = params.iter_mut().find(|param| param.name == *input_field) {
268            param.type_label = "TypeSpec<T>".to_string();
269            param.nullable = false;
270            param.default_value = None;
271            param.enum_values.clear();
272            param.minimum = None;
273            param.maximum = None;
274            param.min_length = None;
275            param.max_length = None;
276            param.min_items = None;
277            param.max_items = None;
278            param.item_type = None;
279        }
280    }
281
282    fn return_fields(&self, static_schema: &serde_json::Value) -> Vec<serde_json::Value> {
283        match self {
284            Self::Static => return_field_metadata(static_schema),
285            Self::FromInputSchema { .. } => Vec::new(),
286        }
287    }
288}
289
290#[derive(Clone, Debug, Default, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
291#[serde(tag = "kind", rename_all = "snake_case")]
292pub enum ToolArgumentProjectionPolicy {
293    #[default]
294    MaterializeProjectedValues,
295    PreserveProjectedRefsInField {
296        field: String,
297    },
298}
299
300impl ToolArgumentProjectionPolicy {
301    pub fn preserve_projected_refs_in_field(field: impl Into<String>) -> Self {
302        Self::PreserveProjectedRefsInField {
303            field: field.into(),
304        }
305    }
306
307    pub fn is_materialize_projected_values(&self) -> bool {
308        matches!(self, Self::MaterializeProjectedValues)
309    }
310}
311
312fn is_default_tool_argument_projection_policy(policy: &ToolArgumentProjectionPolicy) -> bool {
313    policy.is_materialize_projected_values()
314}
315
316#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash, serde::Serialize)]
317#[serde(transparent)]
318pub struct ToolId(String);
319
320impl ToolId {
321    pub fn new(id: impl Into<String>) -> Self {
322        let id = id.into();
323        assert!(!id.trim().is_empty(), "tool id must not be empty");
324        Self(id)
325    }
326
327    pub fn as_str(&self) -> &str {
328        &self.0
329    }
330}
331
332impl<'de> serde::Deserialize<'de> for ToolId {
333    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
334    where
335        D: serde::Deserializer<'de>,
336    {
337        let id = <String as serde::Deserialize>::deserialize(deserializer)?;
338        if id.trim().is_empty() {
339            return Err(serde::de::Error::custom("tool id must not be empty"));
340        }
341        Ok(Self(id))
342    }
343}
344
345impl From<String> for ToolId {
346    fn from(id: String) -> Self {
347        Self::new(id)
348    }
349}
350
351impl From<&str> for ToolId {
352    fn from(id: &str) -> Self {
353        Self::new(id)
354    }
355}
356
357impl std::fmt::Display for ToolId {
358    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
359        f.write_str(&self.0)
360    }
361}
362
363/// Tool metadata exposed to prompts, catalogs, UI, and availability checks.
364/// The optional compact contract is the catalog-facing projection of the
365/// resolved contract; full schemas stay in [`ToolContract`].
366#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
367pub struct ToolManifest {
368    pub id: ToolId,
369    pub name: String,
370    #[serde(default, skip_serializing_if = "String::is_empty")]
371    pub description: String,
372    #[serde(default, skip_serializing_if = "Option::is_none")]
373    pub compact_contract: Option<CompactToolContract>,
374    #[serde(default, skip_serializing_if = "is_default_tool_availability_config")]
375    pub availability: ToolAvailabilityConfig,
376    #[serde(default, skip_serializing_if = "is_default_tool_activation")]
377    pub activation: ToolActivation,
378    #[serde(default, skip_serializing_if = "Option::is_none")]
379    pub availability_override: Option<ToolAvailability>,
380    #[serde(default, skip_serializing_if = "std::collections::BTreeMap::is_empty")]
381    pub bindings: std::collections::BTreeMap<String, serde_json::Value>,
382    #[serde(
383        default,
384        skip_serializing_if = "is_default_tool_argument_projection_policy"
385    )]
386    pub argument_projection: ToolArgumentProjectionPolicy,
387    #[serde(
388        default = "default_tool_scheduling",
389        skip_serializing_if = "is_default_tool_scheduling"
390    )]
391    pub scheduling: ToolScheduling,
392    #[serde(
393        default = "default_tool_retry_policy",
394        skip_serializing_if = "is_default_tool_retry_policy"
395    )]
396    pub retry_policy: ToolRetryPolicy,
397}
398
399impl ToolManifest {
400    pub fn effective_availability(&self) -> ToolAvailability {
401        self.availability_override
402            .unwrap_or_else(|| self.availability.base())
403    }
404}
405
406/// Heavy tool contract resolved only when a prompt or call needs schemas/docs.
407#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
408pub struct ToolContract {
409    #[serde(default = "ToolContract::default_input_schema")]
410    pub input_schema: serde_json::Value,
411    #[serde(default)]
412    pub output_schema: serde_json::Value,
413    #[serde(default, skip_serializing_if = "Vec::is_empty")]
414    pub input_schema_projections: Vec<SchemaProjectionOverride>,
415    #[serde(default, skip_serializing_if = "Vec::is_empty")]
416    pub output_schema_projections: Vec<SchemaProjectionOverride>,
417    #[serde(default, skip_serializing_if = "ToolOutputContract::is_static")]
418    pub output_contract: ToolOutputContract,
419    #[serde(default, skip_serializing_if = "Vec::is_empty")]
420    pub examples: Vec<String>,
421}
422
423impl Default for ToolContract {
424    fn default() -> Self {
425        Self {
426            input_schema: Self::default_input_schema(),
427            output_schema: serde_json::Value::Null,
428            input_schema_projections: Vec::new(),
429            output_schema_projections: Vec::new(),
430            output_contract: ToolOutputContract::Static,
431            examples: Vec::new(),
432        }
433    }
434}
435
436impl ToolContract {
437    pub fn default_input_schema() -> serde_json::Value {
438        serde_json::json!({
439            "type": "object",
440            "properties": {},
441            "additionalProperties": true
442        })
443    }
444
445    pub fn compact_contract(&self, manifest: &ToolManifest) -> CompactToolContract {
446        self.compact_contract_with_example_limit(manifest, COMPACT_TOOL_EXAMPLE_LIMIT)
447    }
448
449    pub fn compact_contract_with_example_limit(
450        &self,
451        manifest: &ToolManifest,
452        example_limit: usize,
453    ) -> CompactToolContract {
454        CompactToolContract {
455            name: manifest.name.clone(),
456            signature: self.input_signature(manifest),
457            returns: self.output_summary(),
458            parameters: self.parameter_metadata(),
459            return_fields: self.output_contract.return_fields(&self.output_schema),
460            description: manifest.description.trim().to_string(),
461            examples: compact_examples(&self.examples, example_limit),
462        }
463    }
464
465    pub fn input_signature(&self, manifest: &ToolManifest) -> String {
466        let params = self
467            .parameter_docs()
468            .into_iter()
469            .map(|p| p.signature_fragment())
470            .collect::<Vec<_>>();
471        let body = if params.is_empty() {
472            "{}".to_string()
473        } else {
474            format!("{{ {} }}", params.join(", "))
475        };
476        format!(
477            "{}{}({})",
478            manifest.name,
479            self.output_contract
480                .type_parameter_suffix()
481                .unwrap_or_default(),
482            body
483        )
484    }
485
486    pub fn output_summary(&self) -> String {
487        self.output_contract.return_type_label(&self.output_schema)
488    }
489
490    pub fn parameter_metadata(&self) -> Vec<serde_json::Value> {
491        self.parameter_docs()
492            .into_iter()
493            .map(|param| param.into_value())
494            .collect()
495    }
496
497    pub fn model_tool(&self, manifest: &ToolManifest) -> ModelTool {
498        ModelTool {
499            name: manifest.name.clone(),
500            description: manifest.description.clone(),
501            input_schema: self.input_schema.clone(),
502            output_schema: self.output_schema.clone(),
503            input_schema_projections: self.input_schema_projections.clone(),
504            output_schema_projections: self.output_schema_projections.clone(),
505        }
506    }
507
508    fn parameter_docs(&self) -> Vec<ParameterDoc> {
509        let mut params = schema_parameter_docs(&self.input_schema);
510        self.output_contract
511            .apply_type_witness_parameter(&mut params);
512        params
513    }
514}
515
516/// Static authoring helper for tools.
517///
518/// Composes the runtime [`ToolManifest`] and [`ToolContract`] projections. Both
519/// are `#[serde(flatten)]`ed so the serialized JSON shape stays flat (and wire/
520/// persistence compatible); the two structs have disjoint field names.
521#[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
522pub struct ToolDefinition {
523    #[serde(flatten)]
524    pub manifest: ToolManifest,
525    #[serde(flatten)]
526    pub contract: ToolContract,
527}
528
529#[derive(Clone, Debug, PartialEq, Eq)]
530pub struct ModelTool {
531    pub name: String,
532    pub description: String,
533    pub input_schema: serde_json::Value,
534    pub output_schema: serde_json::Value,
535    pub input_schema_projections: Vec<SchemaProjectionOverride>,
536    pub output_schema_projections: Vec<SchemaProjectionOverride>,
537}
538
539#[derive(Clone, Debug, PartialEq, Eq, serde::Serialize, serde::Deserialize)]
540pub struct SchemaProjectionOverride {
541    pub profile: String,
542    pub schema: serde_json::Value,
543}
544
545const COMPACT_TOOL_EXAMPLE_LIMIT: usize = 2;
546const COMPACT_TOOL_EXAMPLE_CHAR_LIMIT: usize = 240;
547
548#[derive(Clone, Debug, PartialEq, serde::Serialize, serde::Deserialize)]
549pub struct CompactToolContract {
550    pub name: String,
551    pub signature: String,
552    pub returns: String,
553    #[serde(default, skip_serializing_if = "Vec::is_empty")]
554    pub parameters: Vec<serde_json::Value>,
555    #[serde(default, skip_serializing_if = "Vec::is_empty")]
556    pub return_fields: Vec<serde_json::Value>,
557    #[serde(default, skip_serializing_if = "String::is_empty")]
558    pub description: String,
559    #[serde(default, skip_serializing_if = "Vec::is_empty")]
560    pub examples: Vec<String>,
561}
562
563impl CompactToolContract {
564    pub fn render_signature_head(&self) -> String {
565        format!("{} -> {}", self.signature.trim(), self.returns.trim())
566    }
567
568    pub fn render_signature(&self) -> String {
569        let mut sections = vec![self.render_signature_head()];
570        let parameter_lines = self
571            .parameters
572            .iter()
573            .filter_map(compact_doc_line)
574            .collect::<Vec<_>>();
575        if !parameter_lines.is_empty() {
576            sections.push(format!("Parameters:\n{}", parameter_lines.join("\n")));
577        }
578        let return_field_lines = self
579            .return_fields
580            .iter()
581            .filter_map(compact_doc_line)
582            .collect::<Vec<_>>();
583        if !return_field_lines.is_empty() {
584            sections.push(format!("Return fields:\n{}", return_field_lines.join("\n")));
585        }
586        sections.join("\n")
587    }
588
589    pub fn render_returns(&self) -> String {
590        let mut sections = Vec::new();
591        let return_field_lines = self
592            .return_fields
593            .iter()
594            .filter_map(compact_doc_line)
595            .collect::<Vec<_>>();
596        if !return_field_lines.is_empty() {
597            sections.push(format!("Return fields:\n{}", return_field_lines.join("\n")));
598        }
599        sections.join("\n")
600    }
601
602    pub fn render_markdown(&self) -> String {
603        let mut sections = vec![format!("### {}", self.render_signature_head())];
604        if !self.description.trim().is_empty() {
605            sections.push(self.description.trim().to_string());
606        }
607        if !self.parameters.is_empty() {
608            sections.push(format!(
609                "Parameters:\n{}",
610                self.parameters
611                    .iter()
612                    .filter_map(compact_doc_line)
613                    .collect::<Vec<_>>()
614                    .join("\n")
615            ));
616        }
617        if !self.return_fields.is_empty() {
618            sections.push(format!(
619                "Return fields:\n{}",
620                self.return_fields
621                    .iter()
622                    .filter_map(compact_doc_line)
623                    .collect::<Vec<_>>()
624                    .join("\n")
625            ));
626        }
627        if !self.examples.is_empty() {
628            sections.push(format!("Examples: {}", self.examples.join("; ")));
629        }
630        sections.join("\n")
631    }
632}
633
634impl ToolDefinition {
635    pub fn raw(
636        id: impl Into<ToolId>,
637        name: impl Into<String>,
638        description: impl Into<String>,
639        input_schema: serde_json::Value,
640        output_schema: serde_json::Value,
641    ) -> Self {
642        Self {
643            manifest: ToolManifest {
644                id: id.into(),
645                name: name.into(),
646                description: description.into(),
647                compact_contract: None,
648                availability: ToolAvailabilityConfig::default(),
649                activation: ToolActivation::default(),
650                availability_override: None,
651                bindings: std::collections::BTreeMap::new(),
652                argument_projection: ToolArgumentProjectionPolicy::default(),
653                scheduling: default_tool_scheduling(),
654                retry_policy: default_tool_retry_policy(),
655            },
656            contract: ToolContract {
657                input_schema,
658                output_schema,
659                ..ToolContract::default()
660            },
661        }
662    }
663
664    pub fn typed<Args, Output>(
665        id: impl Into<ToolId>,
666        name: impl Into<String>,
667        description: impl Into<String>,
668    ) -> Self
669    where
670        Args: schemars::JsonSchema,
671        Output: schemars::JsonSchema,
672    {
673        Self::raw(
674            id,
675            name,
676            description,
677            schema_for::<Args>(),
678            schema_for::<Output>(),
679        )
680    }
681
682    pub fn with_examples(mut self, examples: Vec<String>) -> Self {
683        self.contract.examples = examples;
684        self
685    }
686
687    pub fn with_availability(mut self, availability: ToolAvailabilityConfig) -> Self {
688        self.manifest.availability = availability;
689        self
690    }
691
692    pub fn with_activation(mut self, activation: ToolActivation) -> Self {
693        self.manifest.activation = activation;
694        self
695    }
696
697    pub fn with_argument_projection(
698        mut self,
699        argument_projection: ToolArgumentProjectionPolicy,
700    ) -> Self {
701        self.manifest.argument_projection = argument_projection;
702        self
703    }
704
705    pub fn with_scheduling(mut self, scheduling: ToolScheduling) -> Self {
706        self.manifest.scheduling = scheduling;
707        self
708    }
709
710    pub fn with_retry_policy(mut self, retry_policy: ToolRetryPolicy) -> Self {
711        self.manifest.retry_policy = retry_policy;
712        self
713    }
714
715    pub fn with_output_contract(mut self, output_contract: ToolOutputContract) -> Self {
716        self.contract.output_contract = output_contract;
717        self
718    }
719
720    pub fn with_input_schema_projection(
721        mut self,
722        profile: impl Into<String>,
723        schema: serde_json::Value,
724    ) -> Self {
725        let profile = profile.into();
726        self.contract
727            .input_schema_projections
728            .retain(|projection| projection.profile != profile);
729        self.contract
730            .input_schema_projections
731            .push(SchemaProjectionOverride { profile, schema });
732        self
733    }
734
735    pub fn with_output_schema_projection(
736        mut self,
737        profile: impl Into<String>,
738        schema: serde_json::Value,
739    ) -> Self {
740        let profile = profile.into();
741        self.contract
742            .output_schema_projections
743            .retain(|projection| projection.profile != profile);
744        self.contract
745            .output_schema_projections
746            .push(SchemaProjectionOverride { profile, schema });
747        self
748    }
749
750    pub fn with_output_from_input_schema(
751        self,
752        input_field: impl Into<String>,
753        default_schema: Option<serde_json::Value>,
754    ) -> Self {
755        self.with_output_contract(ToolOutputContract::from_input_schema(
756            input_field,
757            default_schema,
758        ))
759    }
760
761    pub fn default_input_schema() -> serde_json::Value {
762        ToolContract::default_input_schema()
763    }
764
765    /// Tool identity. Read very widely, so exposed as a thin accessor over the
766    /// composed [`ToolManifest`].
767    pub fn id(&self) -> &ToolId {
768        &self.manifest.id
769    }
770
771    /// Tool name. Read very widely, so exposed as a thin accessor.
772    pub fn name(&self) -> &str {
773        &self.manifest.name
774    }
775
776    /// Tool description. Read very widely, so exposed as a thin accessor.
777    pub fn description(&self) -> &str {
778        &self.manifest.description
779    }
780
781    pub fn input_signature(&self) -> String {
782        self.contract.input_signature(&self.manifest)
783    }
784
785    pub fn output_summary(&self) -> String {
786        self.contract.output_summary()
787    }
788
789    pub fn signature(&self) -> String {
790        format!("{} -> {}", self.input_signature(), self.output_summary())
791    }
792
793    pub fn compact_contract(&self) -> CompactToolContract {
794        self.compact_contract_with_example_limit(COMPACT_TOOL_EXAMPLE_LIMIT)
795    }
796
797    pub fn compact_contract_with_example_limit(&self, example_limit: usize) -> CompactToolContract {
798        self.contract
799            .compact_contract_with_example_limit(&self.manifest, example_limit)
800    }
801
802    pub fn effective_availability(&self) -> ToolAvailability {
803        self.manifest.effective_availability()
804    }
805
806    pub fn model_tool(&self) -> ModelTool {
807        self.contract.model_tool(&self.manifest)
808    }
809
810    /// Project the manifest, computing the catalog-facing compact contract from
811    /// the resolved [`ToolContract`].
812    pub fn manifest(&self) -> ToolManifest {
813        let mut manifest = self.manifest.clone();
814        manifest.compact_contract = Some(self.contract.compact_contract(&manifest));
815        manifest
816    }
817
818    pub fn contract(&self) -> ToolContract {
819        self.contract.clone()
820    }
821
822    /// Recompose a definition from its [`ToolManifest`] and [`ToolContract`]
823    /// projections — the inverse of [`ToolDefinition::manifest`]/[`ToolDefinition::contract`].
824    pub fn from_parts(manifest: ToolManifest, contract: ToolContract) -> Self {
825        Self { manifest, contract }
826    }
827
828    pub fn format_tool_docs(tools: &[ToolDefinition]) -> String {
829        Self::format_tool_docs_iter(tools.iter())
830    }
831
832    pub fn format_tool_docs_iter<'a>(
833        tools: impl IntoIterator<Item = &'a ToolDefinition>,
834    ) -> String {
835        tools
836            .into_iter()
837            .map(|tool| tool.compact_contract().render_markdown())
838            .collect::<Vec<_>>()
839            .join("\n\n")
840    }
841
842    pub fn parameter_metadata(&self) -> Vec<serde_json::Value> {
843        self.parameter_docs()
844            .into_iter()
845            .map(|param| param.into_value())
846            .collect()
847    }
848
849    fn parameter_docs(&self) -> Vec<ParameterDoc> {
850        let mut params = schema_parameter_docs(&self.contract.input_schema);
851        self.contract
852            .output_contract
853            .apply_type_witness_parameter(&mut params);
854        params
855    }
856}
857
858mod schema_docs;
859pub use schema_docs::schema_for;
860use schema_docs::{
861    ParameterDoc, compact_doc_line, compact_examples, compact_schema_label, return_field_metadata,
862    schema_parameter_docs,
863};
864
865mod schema_validation;
866pub use schema_validation::{LashSchema, validate_tool_input};
867
868include!("tool_contract/tests.rs");
lash_sansio/tool_contract.rs

lash_sansio/
tool_contract.rs
