CompletionKit MCP server

• Registry namecom.completionkit/evalsverified in the MCP registry

The registry name sits under completionkit.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

• Stateanswerschecked 2026-10-21
• Tools54
• Server calls itselfCompletionKit
• Server version0.29.1
• Protocol version2025-06-18

On 2026-10-21 the server answered initialize and tools/list without a sign-in. First answer in 156 ms.

• Whether its tools do the product's job has not been judged yet.
• Checked on 2 of the 7 days it takes to judge reliability.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

• INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
• Use3 GitHub stars
• Answeredmeasuring2 of the 7 daily checks it takes to print a share
• Median first answer314 ms
• Space in an agent's context≈ 6,747 tokensthe definitions of all its tools (54), which an agent carries on every turn
• Tool definitionsC · 65 of 100
• Typed results0 of 54 toolsdeclared outputSchema: results come typed, read once

• No description an agent can choose by: 17 of 54
• Parameters without a description: in 43 of 54
• Not saying whether it only reads or can destroy: 54 of 54

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

• prompts_list

  List all prompts

• prompts_get

  Get a prompt by ID

• prompts_create

  Create a prompt

• prompts_update

  Update a prompt. If the prompt already has runs, this creates a new DRAFT version (current=false) rather than editing in place or publishing. Promote it with prompts_publish, so an agent's edits don't go live without a gate. If it has no…

• prompts_delete

  Delete a prompt

• prompts_publish

  Publish a prompt version, making it the current version

• prompts_suggest_improvement

  Suggest an improved version of a prompt, grounded in a run's test results and judge feedback. Analyzes the run's responses, scores, and reviews, then returns reasoning plus a rewritten template (preserving {{variables}}) and persists it…

• runs_list

  List all runs

• runs_get

  Get a run by ID, including "metric_averages": a per-metric breakdown with each metric's average score (or pass rate for checks), how many rows it graded, and how many scored low. Use this to find the metric dragging a prompt down without…

• runs_create

  Create a run. Omit prompt_id and provide output_column to score existing outputs by grading a pre-existing dataset column instead of generating new ones.

• runs_update

  Update a run

• runs_delete

  Delete a run

• runs_generate

  Start a run. Required for every run, including score-only runs (no prompt): generates responses with the prompt when there is one, otherwise copies the graded dataset column and grades it.

• runs_regrade

  Re-grade a run's existing responses with its currently attached metrics, without regenerating. Use after attaching or editing metrics on an already-generated run.

• runs_rerun

  Create and start a fresh copy of a run with the same prompt, dataset, metrics, and settings. Use when the judge changed and you want a clean run instead of mixing versions.

• runs_retry_failures

  Re-run only the failed responses of a run, optionally limited to specific response ids via "only".

• responses_list

  List responses for a run, in row order. Returns {total, limit, offset, returned, responses}. Defaults to 50 rows because full payloads are large: use "fields" to drop the bodies, "min_score"/"max_score" to isolate low scorers, and sort…

• responses_get

  Get a specific response

• datasets_list

  List all datasets

• datasets_get

  Get a dataset by ID

• datasets_create

  Create a dataset with CSV data. First row is the header. Two column names are recognized specially: "expected_output" is each row's answer key (ground truth) given to the judge and to checks that compare against the row's expected value…

• datasets_update

  Update a dataset

• datasets_delete

  Delete a dataset

• datasets_create_from_url

  Create a dataset by downloading CSV from a URL instead of inlining it. Use this for large datasets: pass a public http(s) URL and the server fetches the CSV directly, so the data never has to pass through the tool-call arguments. The URL…

• metrics_list

  List all metrics

• metrics_get

  Get a metric by ID

• metrics_create

  Create a metric with evaluation criteria. For a deterministic check set metric_type:"check" and check_config. Per-kind required keys: value (contains/not_contains/equals/list_overlap/numeric_equals), pattern (regex), json_path+expected…

• metrics_update

  Update a metric. For a deterministic check set metric_type:"check" and check_config. Per-kind required keys: value (contains/not_contains/equals/list_overlap/numeric_equals), pattern (regex), json_path+expected (json_path_equals), min…

• metrics_delete

  Delete a metric

• metrics_suggest_variants

  Ask the model to rewrite the metric's judge instruction in N variants targeted at the recent disagreements. Each variant is saved as a draft MetricVersion with source="suggestion". Returns the persisted drafts. Stripe-metering hooks fire…

• metric_groups_list

  List all metric groups

• metric_groups_get

  Get a metric group by ID

• metric_groups_create

  Create a metric group

• metric_groups_update

  Update a metric group

• metric_groups_delete

  Delete a metric group

• metric_versions_list

  List every MetricVersion (drafts + published) for a metric, newest first. Each row carries version_number, state, source, current flag, and timestamps.

• metric_versions_publish

  Publish a MetricVersion as the live version of its metric. Works for both 'draft → published' and 'revert to an older published version → current'. Transactionally flips current, demotes peers, and writes the version's instruction +…

• metric_versions_dismiss

  Destroy a draft MetricVersion (use for either source: 'edit' or source: 'suggestion'). Published versions are refused. To demote a published version, publish a different one as current instead.

• provider_credentials_list

  List all provider credentials (API keys are not exposed)

• provider_credentials_get

  Get a provider credential by ID (API key is not exposed)

• provider_credentials_create

  Create a provider credential

• provider_credentials_update

  Update a provider credential. Changing provider or api_endpoint on a credential with a stored key requires api_key in the same call, so a stored key never moves to a new provider or endpoint.

• provider_credentials_delete

  Delete a provider credential

• tags_list

  List all tags

• tags_get

  Get a tag by ID

• tags_create

  Create a tag. Color is auto-assigned.

• tags_update

  Rename a tag.

• tags_delete

  Delete a tag. Removes the tag from every linked metric, prompt, run, and dataset.

• agreements_list

  List agreements. Filter by run_id, response_id, metric_id, or created_by.

• agreements_create

  Upsert an agreement for (run, response, metric, created_by). Verdict is one of agree, disagree, borderline. corrected_score (1..5) is required when verdict is 'disagree'.

• judges_replay

  Create a scoring run for the current judge over a dataset's existing outputs (wraps runs_create with prompt_id omitted and output_column supplied). This only sets up the run; call runs_generate to actually re-judge the outputs so you can…

• judges_compare

  Compare two versions of one metric's agreement stats side by side. Requires metric_id, metric_version_a_id, and metric_version_b_id (both versions must belong to that metric). Unavailable for check metrics.

• promptfoo_import

  Import a promptfooconfig.yaml. Creates a prompt, a dataset from the test vars, and metrics from the assert blocks (llm-rubric/g-eval become judge metrics; contains/equals/regex/is-json become deterministic check metrics). Returns a…

• usage_get

  Get this organization's plan usage and limits for the current billing period: runs and prompt fetches used, their limits, how many remain, and when the period resets. Call this to pre-check quota before starting runs. Runs are…