evals-mcp-server MCP Server

Author verifiable eval records through a draft→review→revise→submit loop with enforced graders.

Publisher claimed. No tool list reported, and Pod has not connected to this server.

Status

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Connect

Published as @cyanheads/evals-mcp-server on npm. Runs locally.

Known issues

9 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 6.

Most discussed

test(evals_revise_draft): mcq_choice_mismatch path not covered

`evals_revise_draft` declares `mcq_choice_mismatch` in its typed error contract (alongside `task_type_constraint`), and the handler calls the shared `assertTaskTypeConstraints` after each patch — so patching `grader.correct` to a value not in `choices[]` should fire `mcq_choice_mismatch`. There is no test that exercises this path.

Proposal

Add a test (or test case in `tests/authoring-loop.test.ts` or a new `tests/tools/revise-draft.tool.test.ts`) that:

Creates an mcq d

Read the thread · 2026-06-28 · closed · 2 comments

ux(evals_get_record): description is meta-coaching — names the caller, not the action

The current evals_get_record description reads:

"Read a draft or submitted eval record by id. The verification subagent calls this to inspect a draft before re-deriving or looking up the gold. The id is stable across submit, so it resolves a record whether it is still a draft or already submitted."

The second sentence names a specific caller type ("verification subagent") and workflow step ("before re-deriving or looking up the gold") — that is meta-coaching, not a description of what the

Read the thread · 2026-06-25 · closed · 1 comment

feat(config): default EVALS_DATA_DIR to ./evals-data so bare npx invocations work

EVALS_DATA_DIR is required with no default — omitting it aborts startup with a config error. .env.example already lists ./evals-data as the natural value. A hardcoded default would let npx/bare invocations work without any env setup, lowering the barrier for first use.

Proposal

Apply ./evals-data as the fallback in src/config/server-config.ts when EVALS_DATA_DIR is unset. Keep the existing .min(1) guard — it rejects an empty string (EVALS_DATA_DIR=) with a clear validation

Read the thread · 2026-06-25 · closed · 1 comment

bug(evals_create_draft): mcq grader correct-not-in-choices fires task_type_constraint instead of mcq_choice_mismatch

Server version

0.1.0

Runtime

Bun

Transport

HTTP / stdio

Description

evals_create_draft fires reason: "task_type_constraint" when the mcq grader's correct value is not in choices[], but the error contract documents this case as reason: "mcq_choice_mismatch". evals_run_check correctly returns mcq_choice_mismatch for the same condition — the two tools are inconsistent.

Steps to reproduce

Call evals_create_draft with task_type: "mcq", `choices: ["P

Read the thread · 2026-06-25 · closed · 1 comment

bug(evals_revise_draft): unknown set path reports false success

Server version

0.1.2

mcp-ts-core version

0.12.3

Runtime

Bun

Runtime version

Bun 1.4.0

Transport

HTTP (Streamable HTTP)

Description

evals_revise_draft reports an unknown set path as successfully applied even though schema validation removes it from the stored record. The success response makes the mutation appear effective when it was a no-op.

Steps to reproduce

Create a valid draft with evals_create_draft.
Call evals_revise_draft with `{ "dr

Read the thread · 2026-08-22 · open · 0 comments

Most recent

bug(grader): numeric grader accepts complex/unit candidates by truncating at the first space

Server version

0.1.2

mcp-ts-core version

0.10.9

Runtime

Bun

Runtime version

Bun 1.3.x (logic bug — runtime-agnostic)

Transport

stdio

Description

The numeric grader coerces a math.js result to a plain number with Number(result.toString().replace(/\s.*$/, '')) (candidateToNumber and resolveNumber in src/services/grader/grader-service.ts). For any non-real result — a math.js Complex or Unit — toString() yields e.g. "2 + 3i"

Read the thread · 2026-06-30 · open · 0 comments

See all 9 reports Pod holds for evals-mcp-server.

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