Serveur MCP
valem
io.github.vlad-public-code/valem
Ce que fait ce MCP
Creates and runs deterministic reactive data models with schemas, derived fields, constraints, effects, browser views, testing, versioning, state management, and audit trails.
Capacités
Outils
27
outils
create_model
Create model
Create a new model from a declarative ModelSpec. The spec carries the JSON schema plus derivations (computed fields), constraints (invariants), and optional effects. Returns the created id. Fails (isError) on an invalid spec. If the requested id is already taken, a numeric postfix (-2, -3, …) is appended so the create still succeeds — always read the returned id, it may differ from the one you sent. When paired with a browser (remote_with_browser mode), ALWAYS include a viewDefinition in the spec so the model is immediately visible/usable in the sandbox — do not omit it and wait to be asked for one afterward. See the valem://guide/view-system resource for the component catalog.
Schéma d’entrée
{'type': 'object', 'required': ['spec'], 'properties': {'spec': {'type': 'object', 'required': ['id', 'schema'], 'properties': {'id': {'type': 'string'}, 'tests': {'type': 'array', 'items': {'type': 'object', 'required': ['expect'], 'properties': {'given': {'type': 'object'}, 'expect': {'type': 'object'}, 'description': {'type': 'string'}}}}, 'schema': {'type': 'object'}, 'effects': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'executor', 'trigger'], 'properties': {'at': {'type': 'string'}, 'id': {'type': 'string'}, 'emit': {'type': 'string'}, 'policy': {'type': 'object'}, 'prompt': {'type': 'string'}, 'afterMs': {'type': 'string'}, 'payload': {'type': 'object'}, 'request': {'type': 'object'}, 'trigger': {'type': 'string'}, 'executor': {'enum': ['caller', 'server', 'llm', 'timer'], 'type': 'string'}, 'requests': {'type': 'string'}, 'response': {'type': 'object'}, 'dedupeKey': {'type': 'string'}, 'statusPath': {'type': 'string'}, 'responseSchema': {'type': 'object'}}}}, 'library': {'type': 'object', 'required': ['define'], 'properties': {'define': {'type': 'string'}, 'signatures': {'type': 'object'}, 'description': {'type': 'string'}}}, 'version': {'type': 'string'}, 'constants': {'type': 'object'}, 'constraints': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'expr'], 'properties': {'id': {'type': 'string'}, 'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'policy': {'enum': ['rollback', 'flag'], 'type': 'string'}, 'message': {'type': 'string'}}}}, 'derivations': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'evaluation': {'enum': ['eager', 'lazy'], 'type': 'string'}}}}, 'defaultValues': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'description': {'type': 'string'}}}}, 'viewDefinition': {'type': 'object'}, 'metaDerivations': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'property', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'property': {'type': 'string'}}}}}, 'description': 'A full ModelSpec document (id, schema, derivations, constraints, effects, defaultValues, views).'}}}
Schéma de sortie
{'type': 'object', 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'version': {'type': 'string', 'description': 'The spec version.'}, 'effectCount': {'type': 'integer', 'description': 'Number of effects.'}, 'constraintCount': {'type': 'integer', 'description': 'Number of constraints.'}, 'derivationCount': {'type': 'integer', 'description': 'Number of derivations.'}, 'metaDerivationCount': {'type': 'integer', 'description': 'Number of meta-derivations.'}}}
delete_model
Delete model
Remove a model from the registry. Fails (isError) if the model does not exist.
Destructif
Schéma d’entrée
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
Schéma de sortie
{'type': 'object', 'properties': {'deleted': {'type': 'boolean', 'description': 'True when the model was removed.'}}}
download_blob
Download blob
Fetch a blob's bytes by id, base64-encoded in the result. Pass 'modelId' to fetch a blob referenced by a specific model (access-scoped); omit it for a direct store fetch. Large blobs may exceed the result-size limit — this channel suits small binaries only.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['blobId'], 'properties': {'blobId': {'type': 'string', 'description': 'The blob id (sha256:...).'}, 'modelId': {'type': 'string', 'description': 'Optional model id to scope the fetch to a referencing model.'}}}
Schéma de sortie
{'type': 'object', 'properties': {'data': {'type': 'string', 'description': 'The blob content, base64-encoded.'}, 'bytes': {'type': 'integer', 'description': 'Size in bytes.'}, 'blobId': {'type': 'string', 'description': 'The requested blob id.'}}}
dry_run
Dry run
Compile a candidate ModelSpec in an ISOLATED throwaway runtime, apply optional sample mutations, and return the resulting merged state (base + derived) — WITHOUT registering it in the live registry. Use this to preview the full reactive cascade of a draft spec.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['spec'], 'properties': {'spec': {'type': 'object', 'required': ['id', 'schema'], 'properties': {'id': {'type': 'string'}, 'tests': {'type': 'array', 'items': {'type': 'object', 'required': ['expect'], 'properties': {'given': {'type': 'object'}, 'expect': {'type': 'object'}, 'description': {'type': 'string'}}}}, 'schema': {'type': 'object'}, 'effects': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'executor', 'trigger'], 'properties': {'at': {'type': 'string'}, 'id': {'type': 'string'}, 'emit': {'type': 'string'}, 'policy': {'type': 'object'}, 'prompt': {'type': 'string'}, 'afterMs': {'type': 'string'}, 'payload': {'type': 'object'}, 'request': {'type': 'object'}, 'trigger': {'type': 'string'}, 'executor': {'enum': ['caller', 'server', 'llm', 'timer'], 'type': 'string'}, 'requests': {'type': 'string'}, 'response': {'type': 'object'}, 'dedupeKey': {'type': 'string'}, 'statusPath': {'type': 'string'}, 'responseSchema': {'type': 'object'}}}}, 'library': {'type': 'object', 'required': ['define'], 'properties': {'define': {'type': 'string'}, 'signatures': {'type': 'object'}, 'description': {'type': 'string'}}}, 'version': {'type': 'string'}, 'constants': {'type': 'object'}, 'constraints': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'expr'], 'properties': {'id': {'type': 'string'}, 'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'policy': {'enum': ['rollback', 'flag'], 'type': 'string'}, 'message': {'type': 'string'}}}}, 'derivations': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'evaluation': {'enum': ['eager', 'lazy'], 'type': 'string'}}}}, 'defaultValues': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'description': {'type': 'string'}}}}, 'viewDefinition': {'type': 'object'}, 'metaDerivations': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'property', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'property': {'type': 'string'}}}}}, 'description': 'The candidate ModelSpec.'}, 'mutations': {'type': 'object', 'description': 'Optional field mutations to apply, keyed by canonical JSON Path (e.g. {"$.price": 10, "$.qty": 3}).', 'additionalProperties': True}}}
Schéma de sortie
{'type': 'object', 'properties': {}}
eval_expression
Evaluate expression
Evaluate a single JSONata expression against a sample input document and return the computed value, or the exact compile/eval error. Write the expr exactly as in a derivation/constraint 'expr': bare dot-paths, no leading $ (e.g. "loan.amount * loan.annualRate / 1200"). Use this to verify an expression before putting it in a spec — it uses the same compiler the runtime validates against. If the expression calls a library function, pass the model's library definition as 'library' — without it every $myFn(...) call fails as undefined.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['expr'], 'properties': {'expr': {'type': 'string', 'description': 'A single JSONata expression (bare dot-paths, no leading $).'}, 'input': {'type': 'object', 'description': 'Sample document the expression runs against (full nested shape, e.g. {"loan": {"amount": 20000}}). Optional; defaults to {}.', 'additionalProperties': True}, 'library': {'type': 'string', 'description': 'Optional JSONata library definition expression whose exports are bound while evaluating, e.g. "( $money := function($n){ $round($n,2) }; [\\"money\\"] )". Pass it when the expression calls $myFn(...).'}, 'constants': {'type': 'object', 'description': 'Optional constants bound as $const while evaluating (and while defining the library).', 'additionalProperties': True}}}
Schéma de sortie
{'type': 'object', 'properties': {'ok': {'type': 'boolean', 'description': 'True when the expression compiled and evaluated.'}, 'error': {'type': 'string', 'description': "'compile' or 'evaluation' when ok is false."}, 'message': {'type': 'string', 'description': 'The compile/eval error message when ok is false.'}, 'undefined': {'type': 'boolean', 'description': "True when the result is JSONata 'undefined' (no match)."}}}
evolve_spec
Evolve spec
Apply an incremental SpecEvolution diff to a model, preserving live state. Returns the new version. Fails (isError) if the evolved spec is invalid, if expectedVersion no longer matches, or if a schema change would strand existing state. Prefer targeted diffs (upsertSchemaNodes/upsertSchemaDefs, upsertComponents, upsertConstants) over resending a whole section (newSchema/newViewDefinition/newConstants).
Destructif
Schéma d’entrée
{'type': 'object', 'required': ['id', 'evolution'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'evolution': {'type': 'object', 'properties': {'backfill': {'type': 'object'}, 'newSchema': {'type': 'object'}, 'newLibrary': {'type': 'object', 'required': ['define'], 'properties': {'define': {'type': 'string'}, 'signatures': {'type': 'object'}}}, 'newVersion': {'type': 'string'}, 'removeViews': {'type': 'array', 'items': {'type': 'string'}}, 'upsertViews': {'type': 'array', 'items': {'type': 'object'}}, 'newConstants': {'type': 'object'}, 'removeEffects': {'type': 'array', 'items': {'type': 'string'}}, 'upsertEffects': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'executor', 'trigger'], 'properties': {'at': {'type': 'string'}, 'id': {'type': 'string'}, 'emit': {'type': 'string'}, 'policy': {'type': 'object'}, 'prompt': {'type': 'string'}, 'afterMs': {'type': 'string'}, 'payload': {'type': 'object'}, 'request': {'type': 'object'}, 'trigger': {'type': 'string'}, 'executor': {'enum': ['caller', 'server', 'llm', 'timer'], 'type': 'string'}, 'requests': {'type': 'string'}, 'response': {'type': 'object'}, 'dedupeKey': {'type': 'string'}, 'statusPath': {'type': 'string'}, 'responseSchema': {'type': 'object'}}}}, 'newDefaultView': {'type': 'string'}, 'expectedVersion': {'type': 'string'}, 'removeConstants': {'type': 'array', 'items': {'type': 'string'}}, 'upsertConstants': {'type': 'object'}, 'removeComponents': {'type': 'array', 'items': {'type': 'object', 'required': ['viewId', 'componentId'], 'properties': {'viewId': {'type': 'string'}, 'componentId': {'type': 'string'}}}}, 'removeSchemaDefs': {'type': 'array', 'items': {'type': 'string'}}, 'upsertComponents': {'type': 'array', 'items': {'type': 'object', 'required': ['viewId', 'component'], 'properties': {'viewId': {'type': 'string'}, 'beforeId': {'type': 'string'}, 'parentId': {'type': 'string'}, 'component': {'type': 'object'}}}}, 'upsertSchemaDefs': {'type': 'object'}, 'newViewDefinition': {'type': 'object'}, 'removeConstraints': {'type': 'array', 'items': {'type': 'string'}}, 'removeDerivations': {'type': 'array', 'items': {'type': 'string'}}, 'removeSchemaNodes': {'type': 'array', 'items': {'type': 'string'}}, 'upsertConstraints': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'expr'], 'properties': {'id': {'type': 'string'}, 'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'policy': {'enum': ['rollback', 'flag'], 'type': 'string'}, 'message': {'type': 'string'}}}}, 'upsertDerivations': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'evaluation': {'enum': ['eager', 'lazy'], 'type': 'string'}}}}, 'upsertSchemaNodes': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'schema'], 'properties': {'path': {'type': 'string'}, 'schema': {'type': 'object'}, 'required': {'type': 'boolean'}}}}, 'removeDefaultValues': {'type': 'array', 'items': {'type': 'string'}}, 'upsertDefaultValues': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'description': {'type': 'string'}}}}, 'removeMetaDerivations': {'type': 'array', 'items': {'type': 'string'}}, 'upsertMetaDerivations': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'property', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'property': {'type': 'string'}}}}}, 'description': 'A SpecEvolution document: newVersion/expectedVersion plus per-section upsert/remove lists. Schema tiers: upsertSchemaDefs/removeSchemaDefs (by $defs name), upsertSchemaNodes/removeSchemaNodes (by canonical data path), or newSchema (wholesale). View tiers: upsertViews/removeViews/newDefaultView, upsertComponents/removeComponents, or newViewDefinition. Constants: upsertConstants/removeConstants or newConstants.'}}}
Schéma de sortie
{'type': 'object', 'properties': {'id': {'type': 'string', 'description': 'The evolved model id.'}, 'version': {'type': 'string', 'description': "The model's new version after evolution."}}}
explain
Explain field
Explain why a field is what it is: returns the recent derivation/constraint trace records for a path from the in-memory ring buffer (inputs, expression, result). For a constraint use the synthetic path "$constraint:<id>". Trace records can be bulky — pass 'limit' to return only the most recent N.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id', 'path'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'path': {'type': 'string', 'description': 'A canonical JSON Path address, e.g. "$.order.total".'}, 'limit': {'type': 'integer', 'minimum': 1, 'description': 'Optional cap; return only the most recent N trace records.'}}}
get_audit
Get audit trail
Query a model's durable, append-only audit trail (newest-first): one record per committed reactive cycle (mutations, derivedUpdated, traces, flaggedConstraints, dispatchedEffects, source, sequence). This is the queryable superset of get_history/explain — it survives the in-memory ring buffer rolling over. Filter with an optional 'pathPrefix' (canonical address), an ISO-8601 'from'/'to' window, and 'limit'. (Embedded mode keeps this in memory for the session; remote/paired mode reads the server's durable store.)
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'to': {'type': 'string', 'description': 'Optional ISO-8601 upper bound (exclusive).'}, 'from': {'type': 'string', 'description': 'Optional ISO-8601 lower bound (inclusive).'}, 'limit': {'type': 'integer', 'minimum': 1, 'description': 'Optional max records (default 100, newest-first).'}, 'pathPrefix': {'type': 'string', 'description': 'Optional canonical address prefix; keep only records that touched a matching field/derivation/constraint.'}}}
get_domain_guidance
Get domain guidance
Get vetted instructions for the hard modelling shapes this domain involves (progressive tax/fee charges, per-period schedules, classification, date math, group-by, …). Read the model description in ANY language, pick the matching topic ids, and call this BEFORE authoring the spec — then follow what it returns. Available topics:
- amortization_schedule — A computed array / per-period schedule: an amortization table, time series, or per-period breakdown (one row per period).
- group_by — Group-by / aggregation over an array: subtotals, counts, sums per category.
- date_math — Date arithmetic: days/months/years between dates, elapsed duration, age from a birth date.
- classification — Deriving a label / tier / band / risk level / status from data via thresholds.
- currency_conversion — Currency / FX conversion of an amount by an exchange rate.
- status_field — A status / state field with flags or labels derived from the current status.
- rank_percentile — Rank / percentile / leaderboard / quartile over an array of values.
- regulated_charge — An official published charge whose rates are set by an authority: a tax, duty, levy, tariff, fee, toll, excise, or customs charge.
- percentage — Percentages / ratios: percent-of, markup, discount, tax-inclusive vs exclusive, share-as-percent.
- unit_conversion — Unit conversion / dimensional consistency: cm-m, kg-lb, C-F, miles-km — one canonical unit per quantity.
- compound_growth — Compound growth / interest: future value, compound interest, exponential growth (the ** operator).
- weighted_average — Weighted sum / weighted average / score over an array of values and weights.
- eligibility — A boolean eligibility / qualification verdict derived from several criteria (and/or of conditions).
- proration — Prorating / allocating an amount across a count or period (per-unit share, partial-period).
- editable_items — A user-edited list of items the user adds, edits and removes: line items, debts, expenses, passengers, participants — each with its own fields.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['topics'], 'properties': {'topics': {'type': 'array', 'items': {'enum': ['amortization_schedule', 'group_by', 'date_math', 'classification', 'currency_conversion', 'status_field', 'rank_percentile', 'regulated_charge', 'percentage', 'unit_conversion', 'compound_growth', 'weighted_average', 'eligibility', 'proration', 'editable_items'], 'type': 'string'}, 'description': 'Ids of the guidance topics that apply (usually 0-2).'}}}
Schéma de sortie
{'type': 'object', 'properties': {'topics': {'type': 'array'}, 'guidance': {'type': 'string', 'description': 'Concatenated instructions for the requested topics.'}}}
get_effective_schema
Get effective schema
Get the effective JSON Schema for a field: the static schema overlaid with LIVE meta-derived constraints (current min/max/required/…). Check this BEFORE writing a value to learn what the reactive pipeline will accept, instead of discovering an invalid mutation only by trying it and getting a schema-violation error.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id', 'path'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'path': {'type': 'string', 'description': 'A canonical JSON Path address, e.g. "$.order.total".'}}}
Schéma de sortie
{'type': 'object', 'properties': {}}
get_field
Get field value
Get the value of a single field by its JSON Path address (e.g. "$.order.total"). Evaluates a LAZY derivation on demand.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id', 'path'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'path': {'type': 'string', 'description': 'A canonical JSON Path address, e.g. "$.order.total".'}}}
get_history
Get history
List the ISO-8601 timestamps of a model's committed mutations (most recent 100).
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
get_library
Get model library
List the JSONata functions and values a model's library exports — what an expression in this model may call, with signature, arity and originating layer. Call it before writing an expression so you reuse the model's existing vocabulary instead of re-deriving it. Returns null when the model declares no library.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
Schéma de sortie
{'type': 'object', 'properties': {'exports': {'type': 'array', 'description': "One entry per exported name: {name, kind ('function'|'constant'), signature, arity, origin}."}, 'description': {'type': 'string', 'description': "The library's prose description, if any."}}}
get_model_info
Get model info
Get summary info for a model: id, version, and derivation/meta/constraint/effect counts.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
Schéma de sortie
{'type': 'object', 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'version': {'type': 'string', 'description': 'The spec version.'}, 'effectCount': {'type': 'integer', 'description': 'Number of effects.'}, 'constraintCount': {'type': 'integer', 'description': 'Number of constraints.'}, 'derivationCount': {'type': 'integer', 'description': 'Number of derivations.'}, 'metaDerivationCount': {'type': 'integer', 'description': 'Number of meta-derivations.'}}}
get_spec
Get model spec
Get the full stored ModelSpec JSON for a model.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
Schéma de sortie
{'type': 'object', 'properties': {}}
get_state
Get state
Get a model's merged state (base fields plus all computed derived fields). On a large model this is the biggest context cost — narrow it: pass 'paths' to project only specific subtrees (canonical addresses, each spliced back into a pruned document at its address), and/or 'depth' to cap nesting (deeper containers collapse to a '<object: N fields>' / '<array: N items>' marker). Pass an optional ISO-8601 'at' timestamp for a point-in-time read from mutation history.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id'], 'properties': {'at': {'type': 'string', 'description': 'Optional ISO-8601 instant (e.g. 2026-07-03T12:00:00Z) for a point-in-time read; omit for current state.'}, 'id': {'type': 'string', 'description': 'The model id.'}, 'depth': {'type': 'integer', 'minimum': 0, 'description': "Optional max nesting depth; containers deeper than this collapse to a size marker. Applied after 'paths'."}, 'paths': {'type': 'array', 'items': {'type': 'string'}, 'description': 'Optional canonical addresses to project, e.g. ["$.order", "$.totals"]. Only these subtrees are returned, spliced back into a pruned document at their addresses; absent addresses are skipped.'}}}
Schéma de sortie
{'type': 'object', 'properties': {}}
get_view
Get view
Evaluate a model's embedded view definition against current state and return the resolved component tree. Pass an optional 'viewId' for a named view; omit for the default view.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'viewId': {'type': 'string', 'description': 'Optional named view id; omit for the default view.'}}}
Schéma de sortie
{'type': 'object', 'properties': {}}
list_models
List models
List the ids of all currently registered Valem models (alphabetical).
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'properties': {}}
mutate
Apply mutations
Apply field mutations to a model and run the reactive pipeline (derivations recompute, constraints enforce, effects dispatch). 'mutations' is a flat map keyed by canonical JSON Path address, e.g. {"$.order.qty": 3}. A ROLLBACK constraint violation returns isError with the structured list of violated constraints. Returns the actionable summary (derivedUpdated / flaggedConstraints / dispatchedEffects); pass includeTraces:true for the full derivation/constraint trace (the same payload 'explain' serves — omit it and call explain only when a value looks wrong).
Schéma d’entrée
{'type': 'object', 'required': ['id', 'mutations'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'mutations': {'type': 'object', 'description': 'Map of canonical JSON Path address to new value, e.g. {"$.order.qty": 3, "$.order.discount": 0.1}.', 'additionalProperties': True}, 'includeTraces': {'type': 'boolean', 'description': 'Include the full derivation/constraint trace in the result (default false).'}}}
Schéma de sortie
{'type': 'object', 'properties': {'traces': {'type': 'array', 'description': 'Full derivation/constraint traces (only when includeTraces:true).'}, 'success': {'type': 'boolean', 'description': 'True when the mutation committed.'}, 'metaUpdated': {'type': 'array', 'description': 'Meta paths recomputed.'}, 'mutatedPaths': {'type': 'array', 'description': 'Base paths written.'}, 'derivedUpdated': {'type': 'array', 'description': 'Derived paths recomputed.'}, 'dispatchedEffects': {'type': 'array', 'description': 'Ids of effects dispatched.'}, 'flaggedConstraints': {'type': 'array', 'description': 'Ids of FLAG-policy constraints that fired.'}}}
pair_browser
Pair with browser
Pair this MCP session with a browser tab on the hosted Valem sandbox so both drive the same live model session. Mints a pairing on first call (or resumes an existing not-yet-approved one) and waits up to a minute for the developer to approve it. Returns {status:"paired"|"already_paired", namespaceId} once done, or {status:"pending", verificationUri, verificationUriComplete, userCode, expiresInSec} if the developer hasn't approved yet — show them verificationUriComplete when present (it already carries the confirmation code, so they only click Approve) and mention that the code on that screen should read userCode; fall back to verificationUri, which requires them to TYPE userCode. Then call this tool again (it resumes the SAME pairing, it does not mint a new one). Every other model tool (create_model, mutate, evolve_spec, get_state, explain, ...) fails with a clear error until pairing succeeds.
Schéma d’entrée
{'type': 'object', 'properties': {}}
patch_model
Patch model
Apply an RFC 6902 JSON Patch document to a model and run the reactive pipeline. Unlike 'mutate' (a flat address→value map), a patch expresses array insert/remove/move and test/copy ops, e.g. [{"op":"add","path":"/order/items/-","value":{...}}, {"op":"remove","path":"/order/items/0"}]. 'path' fields use RFC 6901 JSON Pointer (slash-separated, '-' for array append), NOT the $.-rooted address form. Same result shape and ROLLBACK/schema error handling as 'mutate'.
Schéma d’entrée
{'type': 'object', 'required': ['id', 'patch'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'patch': {'type': 'array', 'items': {'type': 'object'}, 'description': 'An RFC 6902 JSON Patch: an array of {op, path, value?, from?} operations applied in order.'}, 'includeTraces': {'type': 'boolean', 'description': 'Include the full derivation/constraint trace in the result (default false).'}}}
Schéma de sortie
{'type': 'object', 'properties': {'traces': {'type': 'array', 'description': 'Full derivation/constraint traces (only when includeTraces:true).'}, 'success': {'type': 'boolean', 'description': 'True when the mutation committed.'}, 'metaUpdated': {'type': 'array', 'description': 'Meta paths recomputed.'}, 'mutatedPaths': {'type': 'array', 'description': 'Base paths written.'}, 'derivedUpdated': {'type': 'array', 'description': 'Derived paths recomputed.'}, 'dispatchedEffects': {'type': 'array', 'description': 'Ids of effects dispatched.'}, 'flaggedConstraints': {'type': 'array', 'description': 'Ids of FLAG-policy constraints that fired.'}}}
restore
Restore state
Restore a model's state from a snapshot previously returned by 'snapshot' (pass it back verbatim as 'snapshot'). Overwrites the model's current base state. The snapshot must be for the same model.
Destructif
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id', 'snapshot'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'snapshot': {'type': 'object', 'description': "A snapshot object as returned by the 'snapshot' tool.", 'additionalProperties': True}}}
snapshot
Snapshot state
Capture an immutable point-in-time snapshot of a model's state (base document + derived/meta caches). A natural safety step before a risky evolve_spec: keep the returned snapshot and, if the change goes wrong, hand it back to 'restore' to roll the state back.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
Schéma de sortie
{'type': 'object', 'properties': {}}
test_spec
Test spec
Run a spec's embedded test cases (or ad-hoc given->expect cases) through the real reactive pipeline in a throwaway runtime, returning pass/fail plus per-field failures (path, expected, actual). Use this to certify domain behavior before create_model / promotion.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['spec'], 'properties': {'spec': {'type': 'object', 'required': ['id', 'schema'], 'properties': {'id': {'type': 'string'}, 'tests': {'type': 'array', 'items': {'type': 'object', 'required': ['expect'], 'properties': {'given': {'type': 'object'}, 'expect': {'type': 'object'}, 'description': {'type': 'string'}}}}, 'schema': {'type': 'object'}, 'effects': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'executor', 'trigger'], 'properties': {'at': {'type': 'string'}, 'id': {'type': 'string'}, 'emit': {'type': 'string'}, 'policy': {'type': 'object'}, 'prompt': {'type': 'string'}, 'afterMs': {'type': 'string'}, 'payload': {'type': 'object'}, 'request': {'type': 'object'}, 'trigger': {'type': 'string'}, 'executor': {'enum': ['caller', 'server', 'llm', 'timer'], 'type': 'string'}, 'requests': {'type': 'string'}, 'response': {'type': 'object'}, 'dedupeKey': {'type': 'string'}, 'statusPath': {'type': 'string'}, 'responseSchema': {'type': 'object'}}}}, 'library': {'type': 'object', 'required': ['define'], 'properties': {'define': {'type': 'string'}, 'signatures': {'type': 'object'}, 'description': {'type': 'string'}}}, 'version': {'type': 'string'}, 'constants': {'type': 'object'}, 'constraints': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'expr'], 'properties': {'id': {'type': 'string'}, 'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'policy': {'enum': ['rollback', 'flag'], 'type': 'string'}, 'message': {'type': 'string'}}}}, 'derivations': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'evaluation': {'enum': ['eager', 'lazy'], 'type': 'string'}}}}, 'defaultValues': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'description': {'type': 'string'}}}}, 'viewDefinition': {'type': 'object'}, 'metaDerivations': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'property', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'property': {'type': 'string'}}}}}, 'description': 'The ModelSpec whose tests to run.'}, 'tests': {'type': 'array', 'description': "Optional list of test cases (each with 'given' inputs and 'expect' outputs); omit to run the spec's own embedded 'tests'."}}}
Schéma de sortie
{'type': 'object', 'properties': {'total': {'type': 'integer', 'description': 'Total test cases run.'}, 'failed': {'type': 'integer', 'description': 'Cases that failed.'}, 'passed': {'type': 'integer', 'description': 'Cases that passed.'}, 'results': {'type': 'array', 'description': 'Per-case results (with per-field failures on failure).'}}}
upload_blob
Upload blob
Store binary content (base64-encoded in 'data') in the content-addressed blob store and get back a BlobRef {$blobId, $mediaType, $bytes} to embed in a model's binary field. Storage is content-addressed (SHA-256), so uploading identical bytes returns the same $blobId.
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['data'], 'properties': {'data': {'type': 'string', 'description': 'The blob content, base64-encoded.'}, 'mediaType': {'type': 'string', 'description': 'Optional media type (default application/octet-stream).'}}}
Schéma de sortie
{'type': 'object', 'properties': {'$bytes': {'type': 'integer', 'description': 'Size in bytes.'}, '$blobId': {'type': 'string', 'description': 'Content-addressed id (sha256:...).'}, '$mediaType': {'type': 'string', 'description': 'The stored media type.'}}}
validate_spec
Validate spec
Validate a ModelSpec WITHOUT creating it: returns a 'valid' flag plus structured findings (errors + warnings, each with a location and message). Use this to iterate on a draft — fix the reported errors, re-validate — before committing with create_model.
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['spec'], 'properties': {'spec': {'type': 'object', 'required': ['id', 'schema'], 'properties': {'id': {'type': 'string'}, 'tests': {'type': 'array', 'items': {'type': 'object', 'required': ['expect'], 'properties': {'given': {'type': 'object'}, 'expect': {'type': 'object'}, 'description': {'type': 'string'}}}}, 'schema': {'type': 'object'}, 'effects': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'executor', 'trigger'], 'properties': {'at': {'type': 'string'}, 'id': {'type': 'string'}, 'emit': {'type': 'string'}, 'policy': {'type': 'object'}, 'prompt': {'type': 'string'}, 'afterMs': {'type': 'string'}, 'payload': {'type': 'object'}, 'request': {'type': 'object'}, 'trigger': {'type': 'string'}, 'executor': {'enum': ['caller', 'server', 'llm', 'timer'], 'type': 'string'}, 'requests': {'type': 'string'}, 'response': {'type': 'object'}, 'dedupeKey': {'type': 'string'}, 'statusPath': {'type': 'string'}, 'responseSchema': {'type': 'object'}}}}, 'library': {'type': 'object', 'required': ['define'], 'properties': {'define': {'type': 'string'}, 'signatures': {'type': 'object'}, 'description': {'type': 'string'}}}, 'version': {'type': 'string'}, 'constants': {'type': 'object'}, 'constraints': {'type': 'array', 'items': {'type': 'object', 'required': ['id', 'expr'], 'properties': {'id': {'type': 'string'}, 'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'policy': {'enum': ['rollback', 'flag'], 'type': 'string'}, 'message': {'type': 'string'}}}}, 'derivations': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'evaluation': {'enum': ['eager', 'lazy'], 'type': 'string'}}}}, 'defaultValues': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'description': {'type': 'string'}}}}, 'viewDefinition': {'type': 'object'}, 'metaDerivations': {'type': 'array', 'items': {'type': 'object', 'required': ['path', 'property', 'expr'], 'properties': {'expr': {'type': 'string'}, 'path': {'type': 'string'}, 'property': {'type': 'string'}}}}}, 'description': 'The ModelSpec to validate.'}}}
Schéma de sortie
{'type': 'object', 'properties': {'valid': {'type': 'boolean', 'description': 'True when the spec has no errors.'}, 'errors': {'type': 'array', 'description': 'Blocking findings (each with location + message).'}, 'warnings': {'type': 'array', 'description': 'Non-blocking findings.'}}}
verify_audit
Verify audit trail
Verify the tamper-evidence hash chain of a model's durable audit trail. Returns {valid, recordsChecked, firstBrokenSequence, detail}; a false 'valid' points at the first altered/reordered/deleted record. (Embedded mode has no hash chain and reports valid.)
Lecture seule
Idempotent
Schéma d’entrée
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
Schéma de sortie
{'type': 'object', 'properties': {'valid': {'type': 'boolean', 'description': 'True when the whole chain is intact.'}, 'detail': {'type': 'string', 'description': "Human-readable explanation ('ok' when valid)."}, 'recordsChecked': {'type': 'integer', 'description': 'Number of records examined.'}, 'firstBrokenSequence': {'type': 'integer', 'description': 'Sequence of the first broken record, or null.'}}}
Historique
Modifications récentes des outils
Ajouté
pair_browser
17 September 2026 12:53
Ajouté
dry_run
17 September 2026 12:53
Ajouté
test_spec
17 September 2026 12:53
Ajouté
eval_expression
17 September 2026 12:53
Ajouté
validate_spec
17 September 2026 12:53
Ajouté
get_domain_guidance
17 September 2026 12:53
Ajouté
get_view
17 September 2026 12:53
Ajouté
delete_model
17 September 2026 12:53
Ajouté
evolve_spec
17 September 2026 12:53
Ajouté
download_blob
17 September 2026 12:53
Ajouté
upload_blob
17 September 2026 12:53
Ajouté
verify_audit
17 September 2026 12:53
Ajouté
get_audit
17 September 2026 12:53
Ajouté
get_history
17 September 2026 12:53
Ajouté
explain
17 September 2026 12:53
Ajouté
restore
17 September 2026 12:53
Ajouté
snapshot
17 September 2026 12:53
Ajouté
get_effective_schema
17 September 2026 12:53
Ajouté
patch_model
17 September 2026 12:53
Ajouté
mutate
17 September 2026 12:53
Ajouté
get_field
17 September 2026 12:53
Ajouté
get_state
17 September 2026 12:53
Ajouté
get_library
17 September 2026 12:53
Ajouté
get_spec
17 September 2026 12:53
Ajouté
get_model_info
17 September 2026 12:53
Ajouté
create_model
17 September 2026 12:53
Ajouté
list_models
17 September 2026 12:53
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