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MCP Server

valem

io.github.vlad-public-code/valem
Developer Tools Productivity Public & reachable MCP 2026-07-28

What this MCP does

Creates and runs deterministic reactive data models with schemas, derived fields, constraints, effects, browser views, testing, versioning, state management, and audit trails.

Capabilities

Tools

27 tools
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.
Input schema 
{'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).'}}}
Output schema 
{'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.
Destructive
Input schema 
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
Output schema 
{'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.
Read only Idempotent
Input schema 
{'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.'}}}
Output schema 
{'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.
Read only Idempotent
Input schema 
{'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}}}
Output schema 
{'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.
Read only Idempotent
Input schema 
{'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}}}
Output schema 
{'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).
Destructive
Input schema 
{'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 $defs name), upsertSchemaNodes/removeSchemaNodes (by canonical data path), or newSchema (wholesale). View tiers: upsertViews/removeViews/newDefaultView, upsertComponents/removeComponents, or newViewDefinition. Constants: upsertConstants/removeConstants or newConstants.'}}}
Output schema 
{'type': 'object', 'properties': {'id': {'type': 'string', 'description': 'The evolved model id.'}, 'version': {'type': 'string', 'description': "The model's new version after evolution."}}}
explain
Explain field
Explain why a field is what it is: returns the recent derivation/constraint trace records for a path from the in-memory ring buffer (inputs, expression, result). For a constraint use the synthetic path "$constraint:<id>". Trace records can be bulky — pass 'limit' to return only the most recent N.
Read only Idempotent
Input schema 
{'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.)
Read only Idempotent
Input schema 
{'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.
Read only Idempotent
Input schema 
{'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).'}}}
Output schema 
{'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.
Read only Idempotent
Input schema 
{'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".'}}}
Output schema 
{'type': 'object', 'properties': {}}
get_field
Get field value
Get the value of a single field by its JSON Path address (e.g. "$.order.total"). Evaluates a LAZY derivation on demand.
Read only Idempotent
Input schema 
{'type': 'object', 'required': ['id', 'path'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'path': {'type': 'string', 'description': 'A canonical JSON Path address, e.g. "$.order.total".'}}}
get_history
Get history
List the ISO-8601 timestamps of a model's committed mutations (most recent 100).
Read only Idempotent
Input schema 
{'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.
Read only Idempotent
Input schema 
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
Output schema 
{'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.
Read only Idempotent
Input schema 
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
Output schema 
{'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.
Read only Idempotent
Input schema 
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
Output schema 
{'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.
Read only Idempotent
Input schema 
{'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.'}}}
Output schema 
{'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.
Read only Idempotent
Input schema 
{'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.'}}}
Output schema 
{'type': 'object', 'properties': {}}
list_models
List models
List the ids of all currently registered Valem models (alphabetical).
Read only Idempotent
Input schema 
{'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. {"$.order.qty": 3}. A ROLLBACK constraint violation returns isError with the structured list of violated constraints. Returns the actionable summary (derivedUpdated / flaggedConstraints / dispatchedEffects); pass includeTraces:true for the full derivation/constraint trace (the same payload 'explain' serves — omit it and call explain only when a value looks wrong).
Input schema 
{'type': 'object', 'required': ['id', 'mutations'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}, 'mutations': {'type': 'object', 'description': 'Map of canonical JSON Path address to new value, e.g. {"$.order.qty": 3, "$.order.discount": 0.1}.', 'additionalProperties': True}, 'includeTraces': {'type': 'boolean', 'description': 'Include the full derivation/constraint trace in the result (default false).'}}}
Output schema 
{'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.
Input schema 
{'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'.
Input schema 
{'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).'}}}
Output schema 
{'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.
Destructive Idempotent
Input schema 
{'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.
Read only Idempotent
Input schema 
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
Output schema 
{'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.
Read only Idempotent
Input schema 
{'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'."}}}
Output schema 
{'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 $blobId.
Idempotent
Input schema 
{'type': 'object', 'required': ['data'], 'properties': {'data': {'type': 'string', 'description': 'The blob content, base64-encoded.'}, 'mediaType': {'type': 'string', 'description': 'Optional media type (default application/octet-stream).'}}}
Output schema 
{'type': 'object', 'properties': {'$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.
Read only Idempotent
Input schema 
{'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.'}}}
Output schema 
{'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.)
Read only Idempotent
Input schema 
{'type': 'object', 'required': ['id'], 'properties': {'id': {'type': 'string', 'description': 'The model id.'}}}
Output schema 
{'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.'}}}
History

Recent tool changes

Added
pair_browser
Sept. 17, 2026, 12:53 p.m.
Added
dry_run
Sept. 17, 2026, 12:53 p.m.
Added
test_spec
Sept. 17, 2026, 12:53 p.m.
Added
eval_expression
Sept. 17, 2026, 12:53 p.m.
Added
validate_spec
Sept. 17, 2026, 12:53 p.m.
Added
get_domain_guidance
Sept. 17, 2026, 12:53 p.m.
Added
get_view
Sept. 17, 2026, 12:53 p.m.
Added
delete_model
Sept. 17, 2026, 12:53 p.m.
Added
evolve_spec
Sept. 17, 2026, 12:53 p.m.
Added
download_blob
Sept. 17, 2026, 12:53 p.m.
Added
upload_blob
Sept. 17, 2026, 12:53 p.m.
Added
verify_audit
Sept. 17, 2026, 12:53 p.m.
Added
get_audit
Sept. 17, 2026, 12:53 p.m.
Added
get_history
Sept. 17, 2026, 12:53 p.m.
Added
explain
Sept. 17, 2026, 12:53 p.m.
Added
restore
Sept. 17, 2026, 12:53 p.m.
Added
snapshot
Sept. 17, 2026, 12:53 p.m.
Added
get_effective_schema
Sept. 17, 2026, 12:53 p.m.
Added
patch_model
Sept. 17, 2026, 12:53 p.m.
Added
mutate
Sept. 17, 2026, 12:53 p.m.
Added
get_field
Sept. 17, 2026, 12:53 p.m.
Added
get_state
Sept. 17, 2026, 12:53 p.m.
Added
get_library
Sept. 17, 2026, 12:53 p.m.
Added
get_spec
Sept. 17, 2026, 12:53 p.m.
Added
get_model_info
Sept. 17, 2026, 12:53 p.m.
Added
create_model
Sept. 17, 2026, 12:53 p.m.
Added
list_models
Sept. 17, 2026, 12:53 p.m.
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