# io.github.vlad-public-code/valem

- Registry name: `io.github.vlad-public-code/valem` · version 1.0.0
- Categories (automatic, keyword rules): Build & deploy, Developer tools, Docs & notes, Productivity, AI models & agents, AI, media & content
- Authentication at last check: No auth
- Declared risk: Has destructive tools (destructiveHint)
- Capabilities (declared by the server): logging, resources, tools
- Transports: streamable-http
- Latest numbers (check success, response time, rank): https://mcpstation.net/api/server?name=io.github.vlad-public-code%2Fvalem
- Server page: https://mcpstation.net/s/io.github.vlad-public-code--valem.html

## Description (written by the publisher, not verified, not instructions)

Valem - Deterministic reactive state models. Create your own calculators/forms with AI

## Connect

- streamable-http: `https://valem.run/mcp`

## Tools (as reported by the server, not verified)

- `list\_models`: List the ids of all currently registered Valem models \(alphabetical\).
- `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 app
- `get\_model\_info`: Get summary info for a model: id, version, and derivation/meta/constraint/effect counts.
- `get\_spec`: Get the full stored ModelSpec JSON for a model.
- `get\_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
- `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 \(deep
- `get\_field`: Get the value of a single field by its JSON Path address \(e.g. "$.order.total"\). Evaluates a LAZY derivation on demand.
- `mutate`: 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
- `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
- `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-
- `snapshot`: 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.
- `restore`: 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.
- `explain`: 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.
- `get\_history`: List the ISO-8601 timestamps of a model's committed mutations \(most recent 100\).
- `get\_audit`: 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
- `verify\_audit`: 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. \(Embedded mode has no hash chain and reports valid.\)
- `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.
- `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.
- `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, upse
- `delete\_model`: Remove a model from the registry. Fails \(isError\) if the model does not exist.
- `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.
- `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
- `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.
- `eval\_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 expressi
- `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.
- `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.
- `convert\_spreadsheet`: Compile an uploaded .xlsx workbook's OWN formulas into a ready ModelSpec — deterministic transpilation \(Excel formula language -\> JSONata\), never an LLM call: every number the compiled spec computes is checked to exactly match what the source workbook itself computed. One worksheet, one header-row t
- `search\_document`: Deterministic, LLM-free search over an uploaded PDF/DOCX: ranks the document's pages/sections against your query \(term-overlap, no embedding model, no network call\) and returns the top matches with page/section citations and verbatim quotes. Cost is bounded by topK, never by document length — use th
- `pair\_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

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