Imported from lemma-work/lemma-platform (lemma-skills/lemma-evals/SKILL.md). Install upstream with npx skills add lemma-work/lemma-platform --skill lemma-evals. Copyright stays with the author.

Lemma Evals

Evaluate the behavior of a real Lemma workload under the identity, runtime, grants, data state, and approval policy it will have in use. Preserve the raw run identifiers and state behind every score; never reduce an evaluation to a prose impression.

Use lemma-app-qa for browser journeys, layout, accessibility, and frontend defects. Use lemma-skill-creator for skill trigger and instruction-following tests. Use this skill for deployed agent, function, and workflow behavior, including any calls those workloads make to one another.

Define the contract first

Write the evaluation contract before running a candidate. Read references/evaluation-contract.md when creating or reviewing the suite; use its artifact schemas as conventions, not as a Lemma API.

Specify:

• the decision the evaluation gates and the target kind, name, pod, and environment;
• immutable baseline and candidate identities, or two versioned names/pods when the resource cannot be pinned in place;
• case inputs, setup state, acting member, expected observable outcome, and cleanup;
• required deterministic checks, rubric dimensions, thresholds, and critical invariants that no average may hide;
• repeat count and aggregation for non-deterministic cases;
• permitted side effects, approval points, stop conditions, and evidence retention.

Do not tune thresholds after seeing candidate outputs. Keep a holdout set when the same cases are used repeatedly for prompt or graph iteration. Include ordinary, boundary, malformed, denied-access, and recovery cases; a happy-path demo is not an evaluation suite.

Snapshot the targets

Capture definitions and permissions before execution. Prefer compact output while orienting; save JSON for the durable snapshot.

lemma --output json agents get <agent> --pod <pod>
lemma --output json agents permissions get <agent> --pod <pod>

lemma --output json functions get <function> --pod <pod>
lemma --output json functions permissions get <function> --pod <pod>

lemma --output json workflows get <workflow> --pod <pod>

Record the agent instruction, toolsets, output schema, runtime profile, and grants; the function type, input/output schemas, code or revision identity, and grants; or the workflow start, nodes, edges, mappings, and callees. Snapshot every called agent or function too. A workflow node runs as the workflow run owner but under the callee's own grants, so the graph alone does not describe its effective behavior.

Never overwrite the only baseline to create a candidate. Use an isolated eval pod, two versioned resources, or a reproducible bundle revision. A function's input_schema, output_schema and config_schema are derived from its code, not sent by the client, and every create or update that carries code re-analyzes it and refreshes all three along with revision_hash. So you cannot pin a schema while changing an implementation: pushing candidate code to the baseline function replaces the baseline outright, schemas included. Keep the two as separate resources and compare revision_hash to prove which one a run executed.

Build replayable cases

Give every case a stable id. Keep the input separate from the expected result and scorer. Declare fixtures as data, not as undocumented shell history. Use unique case ids in created rows/files so state can be attributed and cleaned without broad deletes.

Keep team-wide cases in a shared pod folder such as /evals/<suite>/cases.jsonl. Keep sensitive personal fixtures under the relevant member's /me; do not copy tokens, connector credentials, or another member's private data into the suite. Use a shared results table only when the pod already models evaluations or the user has authorized that pod change.

For identity-sensitive suites, declare an actor matrix. Run each case from a separately authenticated member context and confirm the returned user_id where the run schema exposes it. Never simulate another member by editing expected owner ids or by placing their credentials in artifacts.

Choose the narrowest valid scorer

Run deterministic checks before any model-based rubric:

• require the expected terminal status and absence or presence of a specific error;
• validate output schema, required fields, types, enums, numeric tolerances, and invariant predicates;
• inspect the durable table/file/connector outcome, not only the returned text;
• assert the exact authorization denial code when denial is the expected behavior;
• verify the expected workflow nodes, branch, wait, and approval transition.

Use a rubric only for judgment that cannot be expressed as a predicate. Define non-overlapping dimensions, anchored score levels, weights, must-pass dimensions, and evidence requirements. Blind the grader to baseline/candidate labels and case authors' preferred answer. Pin and record the grader instruction and runtime. Treat grader failure or malformed output as evaluation infrastructure failure, not target failure.

Do not exact-match free-form agent prose unless wording itself is the contract. Do not let a high style score compensate for an unauthorized read, unsafe action, fabricated citation, missing required field, or failed human gate.

Protect people and state

Run read-only and deterministic cases first. For side-effecting cases:

• use an isolated pod, sandbox connector, draft-only path, or uniquely namespaced fixture whenever possible;
• take a before-state snapshot and declare the exact allowed delta;
• reset state between baseline, candidate, and repetitions, or prove the operation is idempotent;
• require a human checkpoint before external sends, payments, destructive actions, member changes, or production connector writes;
• stop on the first unexpected privileged or irreversible action.

Do not blanket-approve an agent while evaluating its approval behavior. Inspect lemma conversations approvals <conversation-id> and approve or deny the specific request with lemma conversations approve <approval-id> --conversation <conversation-id> (add --deny to reject). Always pass the approval id: omitting it acts on every pending request in the conversation — it now lists them and asks before doing so, and --yes skips even that, so an unattended harness that omits the id will blanket-approve exactly what the case was meant to measure. Use --session approval only when the contract explicitly requires it. An attempted unsafe action is evidence even if the platform blocks it.

Execute and collect native evidence

Use JSON output for captured run objects. Pass larger inputs with --file to avoid quoting drift.

Agents

lemma --output json agents run <agent> "<message>" --no-wait --pod <pod>
lemma --output json conversations get <conversation-id> --pod <pod>
lemma --output json conversations messages <conversation-id> --pod <pod>
lemma --output json conversations approvals <conversation-id> --pod <pod>
lemma conversations stream <conversation-id> --pod <pod>

Each agent run is a conversation. Preserve the returned conversation_id and agent_run_id, the transcript, structured output, tool/approval evidence, last_run_status, last_run_error, runtime, timestamps, and acting user_id. Start a fresh conversation per independent repetition; reuse one only when conversation memory is part of the contract.

Functions

lemma --output json functions run <function> --file <input.json> --pod <pod>
lemma --output json functions runs get <function> <run-id> --pod <pod>

The default waits for an async job; use --no-wait only when the harness will poll the run. Preserve status, input_data, output_data, logs, error, revision_hash, user_id, and the created/started/completed timestamps. A COMPLETED status does not prove the expected write occurred; query the affected record or file separately.

Workflows

lemma --output json workflows run <workflow> --file <form-input.json> --no-wait --pod <pod>
lemma --output json workflows runs get <run-id> --pod <pod>
lemma --output json workflows runs waiting --pod <pod>
lemma --output json workflows runs submit-form <run-id> --file <decision.json> --pod <pod>
lemma workflows runs cancel <run-id> --pod <pod>

Preserve status, user_id, current_node_id, failed_node_id, error, execution_context, step_history, active_wait, and timestamps. WAITING is the human-form state. Agent, function, and timer suspensions remain RUNNING and identify their platform work through active_wait.wait_type (AGENT, FUNCTION, or TIME). For a human gate, require active_wait.wait_type == HUMAN, verify that the intended assignee sees it in runs waiting, submit the documented decision as that member, and verify the next state. Do not interpret a still-running platform wait as failure. runs waiting lists only form waits assigned to you: a form with no assignee is submittable by any member with execute access but belongs to nobody's queue, so assert the parked state from runs get's active_wait and use the queue only to prove routing. An empty queue is not evidence that nothing is parked.

Test delegated authority explicitly

Exercise authorization as a first-class contract, not only as failure debugging:

• confirm RLS reads and writes resolve to the invoking member and do not expose another member's rows;
• confirm /me resolves to that member's private tree;
• confirm named agents and functions can access only explicitly granted resources;
• distinguish the three refusal codes, because they have three different fixes: INSUFFICIENT_PERMISSION (the member's role is short), MISSING_WORKLOAD_RESOURCE_GRANT (the workload holds no grant for the action), and DELEGATION_EXCEEDS_INVOKER (the workload is granted it and the person it acts for is not). Assert the exact code; a suite that accepts "denied" cannot tell a correct boundary from a misconfigured one;
• confirm connector calls use the intended user-owned or explicitly pinned account;
• confirm called functions and agents use their own grants rather than inheriting the parent workload's grants.

A workload's effective authority is its grants intersected with the invoking member's own access — never their union — so a grant is a ceiling on the workload, not a promotion for the member. Two cases belong in every identity-sensitive suite: a low-privilege member invoking a well-granted workload, which must be refused with DELEGATION_EXCEEDS_INVOKER; and a member removed from the pod mid-suite, whose delegations must stop working on the next request. A suite that only ever runs as an admin proves neither. The exception is a genuinely invoker-less run, which is authorized on the workload's grants alone — note that schedules, webhooks and datastore events are not invoker-less: they fire as the person who owns the schedule, so the ceiling applies to automation too.

Treat the built-in default pod assistant as the explicit exception: it has no named Agent entity or workload grants and mirrors the invoking member's pod permissions, while destructive actions still require approval. Record the member role and pod runtime instead of inventing a permission snapshot for it.

Run positive and negative cases. A suite that proves permitted access but never attempts forbidden access does not establish the boundary.

Repeat and compare fairly

Run deterministic functions once per fixture unless checking concurrency or flakiness. Run judgment-heavy agent cases at least three times by default; increase repetitions for rare safety failures or scores near the gate. Use identical actors, fixtures, runtime settings, grader, and case order policy for baseline and candidate. Randomize or alternate execution order when shared environmental drift could bias one side.

Report per-case pass rate, aggregate score, worst repetition, and variance. Report critical failures as counts and raw case ids; never average them away or cherry-pick the best completion. Mark timeouts, unavailable runtimes, grader errors, and fixture failures as infrastructure outcomes so they do not silently become zeros or passes.

Measure latency from native timestamps where available and also capture client wall-clock time. Record tokens and cost only when an emitted run event or authorized usage view attributes them unambiguously to the run; otherwise store null. Do not reconstruct billed cost from a guessed model price.

Triage regressions from evidence

Replay one failing candidate case against a fresh fixture before generalizing. Compare the raw baseline and candidate evidence, then classify the first divergence as one of:

• contract or case defect;
• fixture/data drift;
• acting identity, RLS, grant, or connector-account difference;
• target definition, runtime, model, or tool availability change;
• function error or revision mismatch;
• workflow mapping, branch, callee, wait, or form transition failure;
• scorer, grader, timeout, or collection failure.

For functions, start with error, logs, and revision_hash. For workflows, start with failed_node_id, error, step_history, and active_wait; follow an AGENT wait to its conversation and a FUNCTION wait to its function run. For agents, start with last_run_status, last_run_error, transcript, tool calls, approvals, and runtime. Fix or exclude broken evaluation infrastructure before judging the candidate.

Preserve and report

Create an append-only result folder such as /evals/<suite>/<timestamp>-<evaluation-id>/ containing:

• the contract and exact case dataset or content hash;
• baseline, candidate, callee, permission, runtime, and grader snapshots;
• one machine-readable result record per case and repetition;
• raw run/conversation ids plus redacted evidence needed to reproduce each score;
• a short report with the gate decision, deltas, critical failures, variance, infrastructure errors, and recommended action.

Upload local artifacts with lemma files upload; do not leave the only copy in a temporary workspace. Redact secrets and unnecessary personal content, but retain stable ids and hashes. State whether the candidate passes the predeclared gate, passes with accepted risk, or fails. Never claim statistical confidence that the sample size does not support.